Re: [Interest] What is Qt.red for in QML?
On 6 Feb 2015, at 02:36, Jérôme Godbout jer...@bodycad.com wrote: Sorry read too fast the original post, try to print it, if the int is 0, I would guess it's an indexer for rgba values of some sort. May be wrong on this not near my computer to test On Feb 5, 2015, at 8:29 PM, Ian Monroe i...@monroe.nu wrote: On Thu, Feb 5, 2015 at 3:33 PM, Jérôme Godbout jer...@bodycad.com wrote: you can use the string version color: 'red' or rgba value color: Qt.rgba(1,0,0,1) Doesn't answer Jason's question, I assume it is some historical oddity. It comes from Qt::GlobalColor, and is an enum intended for usage in C++ when you construct a QColor. So the value is 7. It is accessible in QML only because everything from the Qt namespace is made available. Being able to assign this enum to a value of type QColor in QML would require a little more magic in the QML engine, which is not implemented AFAIK. I agree it feels a bit awkward to write a symbolic color as a quoted string in QML… it leaves you wondering if it is stored that way. (It isn’t, though; since any color property in Qt Quick is a QColor, it has to call the QColor constructor taking a QString. Still, a QString had to be constructed, and then thrown away. In an interpreted language, this is only a drop in the bucket.) But specifying Qt.red wouldn’t really feel much better, would it? It’s still a few extra characters to type, and it’s arbitrary to have it in the Qt namespace as opposed to a Color namespace. ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] [Semi OT] Concurrent (multi-threaded) read/write disk IO?
Am 05.02.2015 um 20:21 schrieb Till Oliver Knoll: [...] Other links that I found seem to support that, that the underlying scheduler figures out the best read/write strategy, and any attempt by the application to implement that by itself would be counter-productive [...] One addition: If using the OS without an own scheduler, it makes sense to give the OS an idea what you are about to do with the file. Reading chunks of 256 bytes vs. reading chunks of 1 MB vs. mapping the whole file into memory probably has a higher impact on performance than the number of threads used. For your application: Memory mapping the files, limiting the total mapped size and thus the number of simultaneously mapped files should give the best performance. If you have eight worker threads, each may map its input file into memory and simply access it. The writer part then could be a single thread. Personally, I would give QtConcurrent::mappedReduced() the first try, with all reading (on memory mapped files) and resampling in the map function and the writing in the reduce function. Best Regards / Mit freundlichen Grüßen Rainer Wiesenfarth -- Software Engineer | Trimble Imaging Division Rotebühlstraße 81 | 70178 Stuttgart | Germany Office +49 711 22881 0 | Fax +49 711 22881 11 http://www.trimble.com/imaging/ | http://www.inpho.de/ Trimble Germany GmbH, Am Prime Parc 11, 65479 Raunheim Eingetragen beim Amtsgericht Darmstadt unter HRB 83893, Geschäftsführer: Dr. Frank Heimberg, Hans-Jürgen Gebauer smime.p7s Description: S/MIME Cryptographic Signature ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] How to do a correct drop shadow on a QML Rect?
These flat interfaces are all the rage these days. So I want to make a drop shadow. However the two approaches I can think of don't work. First is the QML DropShadow element. This creates a shadow of a constant color when the source is a rect. It is pixel-equivalent to just another Rect, so that is out. The next is doing my own drop shadow by using 2 Rect with a gradient. (horizontal + vertical) This will render a continuous gradient (good) but won't do the bottom right corner. You can either double blend it, or skip it. Either way, it doesn't look right. So is there a way to shadow a rect? ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Installing on a headless server
On 02/05/2015 09:04 PM, Jason H wrote: I need to install Qt (Enterprise) on a headless server (CentOS) (I use -platform minimal) . There is only the GUI installer. How can I get Qt installed on the server so I can generate reports? --OR-- How can I build my package for distribution (incl deps) to the headless server? Forget the binary package, it's impossible for you to use in this case. Take the centos Qt source package(s?), replace the opensource sources with the enterprise sources in the package, rename to qt-enterprise or something, build the package. That will give you a set of native centos packages with dependency info in them and an easy upgrade path later. It also allows you to easily distribute patches, if you need them. Bo Thorsen, Director, Viking Software. -- Viking Software Qt and C++ developers for hire http://www.vikingsoft.eu ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] How to do a correct drop shadow on a QML Rect?
Hi Jason, Here is an example to attach shadow in material design style to rectangle object: https://github.com/benlau/quickandroid/blob/master/QuickAndroid/Shadow.qml On 6 February 2015 at 12:01, Jason H jh...@gmx.com wrote: These flat interfaces are all the rage these days. So I want to make a drop shadow. However the two approaches I can think of don't work. First is the QML DropShadow element. This creates a shadow of a constant color when the source is a rect. It is pixel-equivalent to just another Rect, so that is out. The next is doing my own drop shadow by using 2 Rect with a gradient. (horizontal + vertical) This will render a continuous gradient (good) but won't do the bottom right corner. You can either double blend it, or skip it. Either way, it doesn't look right. So is there a way to shadow a rect? ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] [Semi OT] Concurrent (multi-threaded) read/write disk IO?
Does it make sense to guarantee/enforce sequential (exclusive) access to the harddisk on application level, or would I re-invent functionality already present in the underlying OS/disk driver (and maybe even sacrifice performance)? It depends on the task at hand. If you know you are going to perform significant IO, it makes sense to limit the number of reads/writes to the storage device. This is especially true when the storage medium is slow. Specifically I have the following scenario in mind: batch image conversion. Let's assume we have a Work Queue (original images) and a Result Queue (processed images). Some worker pool would dequeue (take) work items (images) from the Work Queue, process it and enqueue (put) it into the Result Queue. Have you looked at ThreadWeaver ( http://api.kde.org/frameworks-api/frameworks5-apidocs/threadweaver/html/index.html)? They have an example application that does the exact scenario you are describing. In this case, you would have a thread pool and you would just issue jobs instead of managing your threads directly. You can have a job that performs the IO and put restrictions on how many of those jobs can be run in concurrently. If the answer is don't bother in your application! Just read and write at the same time and the OS/driver will figure out the best access pattern for you already!, then I guess consideration of SSDs probably become moot. I am using ThreadWeaver on an embedded device that has to write to an SD-Card. File IO is painfully slow but using ThreadWeaver allows for me to rate limit complex events appropriately. When moving my application to an SSD, I just change how many concurrent File IO events run in parallel so that it can scale with the system. Keith ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] [Semi OT] Concurrent (multi-threaded) read/write disk IO?
Am 05.02.2015 um 14:25 schrieb Till Oliver Knoll till.oliver.kn...@gmail.com: ... Does it make sense to guarantee/enforce sequential (exclusive) access to the harddisk on application level, or would I re-invent functionality already present in the underlying OS/disk driver (and maybe even sacrifice performance)? I eventually found a link which seems to confirm that it would be best to only have sequential read/write access with physically spinning drives, that is, have some kind of IO Manager in the application: http://www.tomshardware.co.uk/forum/251768-32-impact-concurrent-speed Off course the tricky part then is that the Writer thread does not block the Reader thread for too long, such that the Work Queue would become empty (and the worker threads would be sitting there idle). Likewise the Writer thread must have enough chances to write, such that the Result Queue becomes not too large (memory constraints). Probably some kind of priorisation scheme taking Queue counts into consideration is the answer - but not part of my question; I am really just interested in whether concurrent read/write access should be avoided in the first place these days (or not). For SSDs it still might be okay (or even better?) to use concurrent read/write access? Any other thoughts on that? Thanks, Oliver___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Q_OS_ANDROID macro
2015-02-04 16:32 GMT-02:00 Giuseppe D'Angelo giuseppe.dang...@kdab.com: Il 04/02/2015 11:18, Reinhardt Behm ha scritto: MOC does not understand and therefor does not respect macros and #ifdef. I'm sorry to be blunt, but this is simply false. moc has had a full C++ preprocessor since Qt 5.0. -- Giuseppe D'Angelo | giuseppe.dang...@kdab.com | Software Engineer KDAB (UK) Ltd., a KDAB Group company Tel. UK +44-1738-450410, Sweden (HQ) +46-563-540090 KDAB - Qt Experts - Platform-independent software solutions ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest Sorry, I'm used to Qt up to 4.8. ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] [Semi OT] Concurrent (multi-threaded) read/write disk IO?
On 05/02/2015 14:44, Till Oliver Knoll wrote: Am 05.02.2015 um 14:25 schrieb Till Oliver Knoll till.oliver.kn...@gmail.com mailto:till.oliver.kn...@gmail.com: ... Does it make sense to guarantee/enforce sequential (exclusive) access to the harddisk on application level, or would I re-invent functionality already present in the underlying OS/disk driver (and maybe even sacrifice performance)? I eventually found a link which seems to confirm that it would be best to only have sequential read/write access with physically spinning drives, that is, have some kind of IO Manager in the application: http://www.tomshardware.co.uk/forum/251768-32-impact-concurrent-speed Off course the tricky part then is that the Writer thread does not block the Reader thread for too long, such that the Work Queue would become empty (and the worker threads would be sitting there idle). Likewise the Writer thread must have enough chances to write, such that the Result Queue becomes not too large (memory constraints). Probably some kind of priorisation scheme taking Queue counts into consideration is the answer - but not part of my question; I am really just interested in whether concurrent read/write access should be avoided in the first place these days (or not). For SSDs it still might be okay (or even better?) to use concurrent read/write access? The usual answer is it depends.. It depends on how much data you are accessing at each write/read. It also depends on the underlying filesystem and size of files / how many files you are dealing with. It also depends on your disk array, if you have one or more disks and capacity of the disks, which affects then number of read/write heads the disk has. Also The NCQ* implementation and cache RAM amount in a disk makes a difference. Then it depends if you need transactional writes, does the write need to sync immediately? If you are on linux, you already get a lot of optimization out of the box, it is typically much better than any other OS. But even within linux the filesystem used makes a difference, for example some filesystems are good with lots of small files. Sometimes file deletion is the bottleneck. In the end in spinning drives the underlying physics of spinning media and moving read/write heads affect things. SSDs are typically ~100 times faster in seek operations. Even there controllers cause significant differences depending on read/write patterns. So before optimizing I'd benchmark, especially on linux the filesystem layer typically does a decent job already. But if you want maximum IO performance, the rule of thumb is to group your reads and writes, and read/write as much data as possible at once. Even SSDs typically favor this. In highly parallel supercomputer settings different rules may apply. Just my 2 cents, Harri *http://en.wikipedia.org/wiki/Native_Command_Queuing ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Qt 5 Creator (Mac) Debugger should use the system python executable
On Wednesday February 04 2015 23:44:25 André Pönitz wrote: The solution is to start LLDB, and use the Python it links to implicitly by using the LLDB 'script' command, instead of hoping that the system Python is the right one. In fact, are you really sure?? I just did this on OS X: % lldb (lldb) script Python Interactive Interpreter. To exit, type 'quit()', 'exit()' or Ctrl-D. sys.executable '/opt/local/bin/python' sys.version '2.7.5 (default, Mar 9 2014, 22:15:05) \n[GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.0.68)]' That's MacPorts' python, not the system one, and the one that's first in my path but which caused errors debugging in Qt Creator before I realised I was tapping into the wrong Python ... R. ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] [Semi OT] Concurrent (multi-threaded) read/write disk IO?
Hi all, This is somewhat unrelated to Qt, but I hope one or another has stumbled over this and can share some thoughts. Does it make sense to guarantee/enforce sequential (exclusive) access to the harddisk on application level, or would I re-invent functionality already present in the underlying OS/disk driver (and maybe even sacrifice performance)? I first want to focus on slow physically spinning harddisks before we come to SSD (in case that makes a significant difference anyway). Specifically I have the following scenario in mind: batch image conversion. Let's assume we have a Work Queue (original images) and a Result Queue (processed images). Some worker pool would dequeue (take) work items (images) from the Work Queue, process it and enqueue (put) it into the Result Queue. The Work Queue size would be limited, but as soon as the count would drop below some threshold some Reader thread would fill it again (by reading images from disk). Likewise the Result Queue would be emptied by a Writer thread. Now my question is about whether to fill the Work Queue (read from disk) and empty the Result Queue (write to disk) concurrently (2 threads: Reader and Writer), or have the disk access go through some kind of IO Manager, such that disk access is sequential (be it read or write operations, while making sure not to starve either operation, e.g. some fair access pattern). To clarify: I do not want to have multiple threads to all /read/ different files at the same time (or write, for that matter - at least for now). My concern is not to trash the hardisk by reading and writing at the same time. Or rather: whether I should be concerned at all on an application level. If the answer is don't bother in your application! Just read and write at the same time and the OS/driver will figure out the best access pattern for you already!, then I guess consideration of SSDs probably become moot. If the answer would be avoid concurrent read/write access on spinning harddisks!, would it be different for SSDs then? Thanks for sharing your thoughts! Oliver ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] double-buffering, quality drop
Am Mittwoch, 4. Februar 2015, 11:22:15 schrieben Sie: not sure how the graphicsitem comes into all of this, but no you cant draw on it. Well, we use QGraphicsScene/View with QGraphicsItems. you can draw on a QGraphicsWidget or you can derive from QGraphicsItem and draw in its paint() method. The Curve-class is already derived from QGraphicsItem and I reimplement the paint()-function. As you suggested, I use the QPainter passed to this function to draw onto a QPixmap. Once I'm done with this I want to call painter-drawPixmap() to draw on the QGraphicsItem... Also, by making the painter to paint on the pixmap with painter.begin(pixmap) I get the warning QPainter is already active - the painter is already initialized/prepared for the graphics item. Any other ideas? -- Alexander ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] Wrong App Name on Android
___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Wrong app name on android
On 05/02/2015 16:48, Jason H wrote: So I have an app name in the Application: Application Name field of the manifest viewer. But when I deploy it, it only comes up with the Qt project name (project in project.pro) How do I get the version on the phone to match the Application name? Hmm... I don't recall exact details, but I believe I edited the manifest by hand, in application android:label=NameHere ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] Wrong app name on android
So I have an app name in the Application: Application Name field of the manifest viewer. But when I deploy it, it only comes up with the Qt project name (project in project.pro) How do I get the version on the phone to match the Application name? Qt 5.4 QtCreator 3.3 ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Wrong app name on android
There I have: android:label=@string/app_name Which in android world is a reference to a string in the resources file. I guess Qt is supplying the project name, not the Application Name. I manually edited the label for the activity and it and works! I think this should be a bug. So I made one. https://bugreports.qt.io/browse/QTBUG-44324 Sent: Thursday, February 05, 2015 at 3:22 PM From: Harri Pasanen ha...@mpaja.com To: Jason H jh...@gmx.com Cc: interest@qt-project.org Subject: Re: [Interest] Wrong app name on android Hmm... I seem to have android:label attribute both for application and activity It may well be the latter that is shown under the icon. On 05/02/2015 21:14, Jason H wrote: Yes. I checked the application android:label=NameHere and it is correct. But I still get project as the application label in the phone's (launcher/home screen/app list). When I say it does not match I mean to say that label=NameHere does not match what is in the phone. Thanks. Sent: Thursday, February 05, 2015 at 2:58 PM From: Harri Pasanen ha...@mpaja.com To: Jason H jh...@gmx.com Cc: interest@qt-project.org Subject: Re: [Interest] Wrong app name on android Just to clarify, are you talking about the name that appears below the icon in Android launcher? Have you checked what name is in the phone app settings? Manifest and xml are the same thing to me, AndroidManifest.xml, so I don't quite parse your sentence below either... Harri On 05/02/2015 20:26, Jason H wrote: I've checked the manifest The correct value is there... and uninstalled/reinstalled and it still does not match what is in the XML. I pushed it via the debugger - but other people who download it from the app store have the same problem. Sent: Thursday, February 05, 2015 at 10:54 AM From: Harri Pasanen ha...@mpaja.com To: interest@qt-project.org Subject: Re: [Interest] Wrong app name on android On 05/02/2015 16:48, Jason H wrote: So I have an app name in the Application: Application Name field of the manifest viewer. But when I deploy it, it only comes up with the Qt project name (project in project.pro) How do I get the version on the phone to match the Application name? Hmm... I don't recall exact details, but I believe I edited the manifest by hand, in application android:label=NameHere ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] [Semi OT] Concurrent (multi-threaded) read/write disk IO?
Hi Harri, Rainer, thanks for sharing your thoughts! Am 05.02.15 um 15:19 schrieb Harri Pasanen: On 05/02/2015 14:44, Till Oliver Knoll wrote: Am 05.02.2015 um 14:25 schrieb Till Oliver Knoll till.oliver.kn...@gmail.com mailto:till.oliver.kn...@gmail.com: ... I am really just interested in whether concurrent read/write access should be avoided in the first place these days (or not). ... The usual answer is it depends.. It depends on how much data you are accessing at each write/read. It also depends on the underlying filesystem and size of files / how many files you are dealing with. In my concrete use case I have ordinary single harddisk desktop systems in mind, that is, no embedded (limited) hardware, but also no dedicated file server with RAID, highly optimised Super-Filesystem and so on - just plain vanilla desktops. Also, in my concrete use case I have batch resize of photos in mind, where each file is around 5 (JPEG) - 25 (Raw) MByte in size. I don't know how fast the actual resizing will be - I have a combined CPU/GPU solution in mind, for the sake of getting a bit into OpenCL - but I imagine it won't empty the Work Queue faster than I can fill it by reading the original images from disk and enqueuing it into the Work Queue. Also, I plan to have a size limit of the Work Queue, so I imagine I won't be reading full steam all the time (but who knows - maybe I end up being able to scale an image faster than I can read and decode the JPEG data ;)) So whenever I am not reading I could use that time to empty the Result Queue and write the data to disk. And off course the assumption is that we read and write from/to the same harddisk ;) I guess there are still a lot of depends in that use case above. I was hoping to get a general advice/rule of thumb whether it is a good idea to have two distinct threads, reading/writing concurrently from/to the harddisk, where the data is big ((several MByte), but not as big as in streaming a movie (in the order of GB). It also depends on your disk array, if you have one or more disks and capacity of the disks, which affects then number of read/write heads the disk has. Also The NCQ* implementation and cache RAM amount in a disk makes a difference. I was actually hoping that nowadays modern (say, = 3 years old) harddisks and Operating Systems (Windows, Linux, Mac) would handle the above case somehow for me, given that the size of each file is up to 25 MBytes, and I could just go ahead and read/write. Maybe there is even a technique which optimises concurrent read/write operations (off course an OS/harddisk controller could only go that far to optimise concurrent access - I guess when I try to read e.g. 10 times the same file, or even different files, at different locations then it's game over). If you are on linux, you already get a lot of optimization out of the box, it is typically much better than any other OS. But even within linux the filesystem used makes a difference, for example some filesystems are good with lots of small files. Sometimes file deletion is the bottleneck. In the end in spinning drives the underlying physics of spinning media and moving read/write heads affect things. In the end I think it is really the required physical moving of that head, rather than the file system (the file system might have an influence on how the data is distributed on the physical drive, but I guess that is negligible with regards to concurrent read/write operations, no?). But if you want maximum IO performance, the rule of thumb is to group your reads and writes, and read/write as much data as possible at once. Even SSDs typically favor this. In highly parallel supercomputer settings different rules may apply. That's what my gut feeling tells me as well. Also Stack Overflow answers to question like these seem to confirm this: http://stackoverflow.com/questions/5321768/how-many-threads-for-reading-and-writing-to-the-hard-disk On the other hand Rainer wrote: Am 05.02.15 um 15:24 schrieb Rainer Wiesenfarth: From: Till Oliver Knoll Am 05.02.2015 um 14:25 schrieb Till Oliver Knoll: ... http://www.tomshardware.co.uk/forum/251768-32-impact-concurrent-speed [...] Please note that this post is more than five years old. Things - namely I/O schedulers in operating systems and hard disk caching - have changed since then. I was hoping so, too. I would _assume_ that any modern OS is capable of scheduling I/O for maximum performance. In addition, an own I/O scheduler would probably only work for bare metal access to the harddisk. Otherwise, the underlying file system and its potential fragmentation might void all your effort. Thus my approach would be to start any number of concurrent reads and writes that makes sense for the application side and start optimizing if (and only if!) throughput is too bad. Other links that I found seem to support that, that the underlying scheduler figures out the best read/write
Re: [Interest] pyqtdeployed app crashes android but not iOS
I have determined that it fails here in pythonrun.c in function initstdio():
fd = fileno(stdin);
/* Under some conditions stdin, stdout and stderr may not be connected
* and fileno() may point to an invalid file descriptor. For example
* GUI apps don't have valid standard streams by default.
*/
if (!is_valid_fd(fd)) {
std = Py_None;
Py_INCREF(std);
}
else {
std = create_stdio(iomod, fd, 0, stdin, encoding, errors);
if (std == NULL) { this is true and it proceeds to return an error
and abort
I haven’t determined yet why create_stdio fails, or why fileno(stdin) returns a
valid fd if there is no stdin for the process on Android?
I don’t understand the rationale here: why every process should have a stdin
and why the Python interpreter needs to initialize it (especially on Android
with PyQt.)
One comment in the discussion of Python issue 17797 says a workaround is to
redirect stdio to a file before calling Py_InitializeEx (and thus initstdio() )
Note that issue 17797 has recent comments in the last few days. The thread
says any ‘fix’ for Python (at least in regards Windows VS11 as a culprit) must
wait till Python3.5. The pertinent code in Python seems to have been changed
recently.___
Interest mailing list
Interest@qt-project.org
http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Wrong app name on android
I've checked the manifest The correct value is there... and uninstalled/reinstalled and it still does not match what is in the XML. I pushed it via the debugger - but other people who download it from the app store have the same problem. Sent: Thursday, February 05, 2015 at 10:54 AM From: Harri Pasanen ha...@mpaja.com To: interest@qt-project.org Subject: Re: [Interest] Wrong app name on android On 05/02/2015 16:48, Jason H wrote: So I have an app name in the Application: Application Name field of the manifest viewer. But when I deploy it, it only comes up with the Qt project name (project in project.pro) How do I get the version on the phone to match the Application name? Hmm... I don't recall exact details, but I believe I edited the manifest by hand, in application android:label=NameHere ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] Additional output from QtCore
Greetings everybody! I'm looking for a piece of advice. Let me describe the problem. We have QTimer which emits a signal each N seconds. The timer has queued connection between timeout signal and sltTimeout slot. The slot has some output (to identify if the signal was emitted). For some time we have everything working perfectly fine: timer emit signal each N seconds and sltTimeout printouts appeared each N seconds. At some moment in time we stop receiving them, but other traces from the process are available. Unfortunately, as far as connection is queued we can't really say if the signal was emitted but was not handled. Is there any way to get any additional information from QtQore about it's internal message queue? I think it could give us some intuition why we missed QTimer event. Could you point at some modules or classes in qtbase which can give me an impression about what is going on inside qt? I would really appreciate any advises from your side. Thank you! -- Sincerely yours, Valery Kotov ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] [Semi OT] Concurrent (multi-threaded) read/write disk IO?
From: Till Oliver Knoll Am 05.02.2015 um 14:25 schrieb Till Oliver Knoll: ... Does it make sense to guarantee/enforce sequential (exclusive) access to the harddisk on application level, or would I re-invent functionality already present in the underlying OS/disk driver (and maybe even sacrifice performance)? I eventually found a link which seems to confirm that it would be best to only have sequential read/write access with physically spinning drives, that is, have some kind of IO Manager in the application: http://www.tomshardware.co.uk/forum/251768-32-impact-concurrent-speed [...] Please note that this post is more than five years old. Things - namely I/O schedulers in operating systems and hard disk caching - have changed since then. I would _assume_ that any modern OS is capable of scheduling I/O for maximum performance. In addition, an own I/O scheduler would probably only work for bare metal access to the harddisk. Otherwise, the underlying file system and its potential fragmentation might void all your effort. Thus my approach would be to start any number of concurrent reads and writes that makes sense for the application side and start optimizing if (and only if!) throughput is too bad. Best Regards / Mit freundlichen Grüßen Rainer Wiesenfarth -- Software Engineer | Trimble Geospatial Rotebühlstraße 81 | 70178 Stuttgart | Germany Office +49 711 22881 0 | Fax +49 711 22881 11 http://www.trimble.com/geospatial/ | http://www.inpho.de/ Trimble Germany GmbH, Am Prime Parc 11, 65479 Raunheim Eingetragen beim Amtsgericht Darmstadt unter HRB 83893, Geschäftsführer: Dr. Frank Heimberg, Hans-Jürgen Gebauer smime.p7s Description: S/MIME cryptographic signature ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] [Semi OT] Concurrent (multi-threaded) read/write disk IO?
Am 05.02.2015 um 14:44 schrieb Keith Gardner kreios4...@gmail.com: Thanks for the quick reply! ... Specifically I have the following scenario in mind: batch image conversion. ... Have you looked at ThreadWeaver (http://api.kde.org/frameworks-api/frameworks5-apidocs/threadweaver/html/index.html)? They have an example application that does the exact scenario you are describing. In this case, you would have a thread pool and you would just issue jobs instead of managing your threads directly. I have quickly read the description. At a quick glance ThreadWeaver seems to be the equivalent of Grand Central Dispatch or an extended QThreadPool/QRunnable. At the moment I am not yet concerned about how I would organise my Reader/Writer/Worker threads. At the moment my question is rather: does it actually make sense to have two distinct Reader/Writer threads (assuming concurrent access to the harddisk, which would be magically optimised by the underlying OS), or shall I just have one single thread which either reads or writes at a time? You can have a job that performs the IO and put restrictions on how many of those jobs can be run in concurrently. Or in other words, given such an organisation of threads (jobs): shall I or shall I not put restrictions on such IO jobs? If the answer is don't bother in your application! Just read and write at the same time and the OS/driver will figure out the best access pattern for you already!, then I guess consideration of SSDs probably become moot. I am using ThreadWeaver on an embedded device that has to write to an SD-Card. File IO is painfully slow but using ThreadWeaver allows for me to rate limit complex events appropriately. So I understand concurrent read/write on an SD-Card is worse than sequential, and you solved that by (rate) limiting the number of concurrent IO jobs to 1. In my case I am only concerned about desktop class systems (Mac, Linux, Windows), but I get your message: even iMacs with their rather slow laptop class harddisks would suffer if I would read/write at the same time. Then again: don't those desktop class OSes have sophisticated IO algorithms which would maybe slightly delay a write operation (buffering it in the meantime), until a given read operation would stop? Or in other words: wouldn't those OSes (or the harddisk drivers or even harddisk controllers/firmwares) interleave my continuous read/write requests in a clever way already, such as not to thrash the disk too much? Somehow I have the feeling that by enforcing sequential access on application level (in whatever means: restricting the number of concurrent IO Jobs to 1, homegrown IO Manager...) I would re-invent the wheel, or even worse: sacrifice IO performance (since the OS would do a way better job at scheduling read/write requests) When moving my application to an SSD, I just change how many concurrent File IO events run in parallel so that it can scale with the system. So I understand concurrent read/write access is not such a problem for SSDs. It would be nice if I would not have to distinguish between slow moving harddisk and SSD in my application and the underlying OS would do the optimal read/write access pattern for me. Then on the other hand I am realist and I get from your experience that I /do/ have to care on application level... Thanks! Oliver___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Qt 5 Creator (Mac) Debugger should use the system python executable
On Thursday February 05 2015 20:57:53 André Pönitz wrote: Hi André I haven't looked at the Creator code for a while, but doesn't it launch Python with a .py file? Not anymore. Ok, from what version if I may ask? Invoking sys.executable inside LLDB does not reliably produce a Python executable usable with that LLDB. Not even on Linux. This probably more a question to ask on the lldb ML, but that surprises me more than just a bit. My OS X lldb (inside the Xcode bundle) is linked against /Applications/Xcode.app/Contents/SharedFrameworks/LLDB.framework/LLDB, which in turn is linked against /System/Library/Frameworks/Python.framework/Versions/2.7/Python . So that's the python it should be loading when it starts an embedded interpreter. I see that that interpreter indeed gives a sys.path that includes the paths from my MacPorts python-2.7 , which I never realised was possible. Interestingly sys.version is unchanged though... The point of invoking LLDB first is to not have to care where its Python support infrastructure lives. No argument there, it makes sense, and means this thread came too late (pending verification, though ;)). R. ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] Qml Compiler fails
I added StyledTextField.qml to my qml.qrc, when I compile now it says: qtquickcompiler_loader.o: In function `QtQuickCompilerGeneratedModule::__StyledTextField_qml::createCompilationUnit()': /home/jason/Projects/build-xxx-Desktop_Qt_5_4_0_GCC_64bit-Debug/.qtquickcompiler/qtquickcompiler_loader.cpp:467: undefined reference to `QtQuickCompilerGeneratedModule::__StyledTextField_qml::moduleFunctions' /home/jason/Projects/build-xxx-Desktop_Qt_5_4_0_GCC_64bit-Debug/.qtquickcompiler/qtquickcompiler_loader.cpp:467: undefined reference to `QtQuickCompilerGeneratedModule::__StyledTextField_qml::qmlData' qtquickcompiler_loader.o:(.data.rel.ro+0x320): undefined reference to `QtQuickCompilerGeneratedModule::__StyledTextField_qml::qmlData' This is the first file I've added since switching to the QML compiler. I did a rebuild. What is going wrong? ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] hi-res drawing on Windows
Is there a comprehensive overview of drawing for monitors at various resolutions on Windows? I am trying to get our application to work correctly on a hi-res monitor on Windows. In particular, I have a QToolButton-derived class that makes a button that is just the icon, with no visible frame. It overrides sizeHint(), maximumSize() and paintEvent() to do this. Instances of the button are given icons from PNG resources that have both standard and @2x versions. One point of this class is to size the button based on the size of the icon. Thus, sizeHint() and maximumSize() both return iconSize(). In the paintEvent(), I get the icon out of the button using icon(), get the QWindow for the window hosting the button and then use QIcon::pixmap(QWindow *, iconSize(), ...) to get the appropriate QPixmap to draw. On Macintosh this works great. On my 5k iMac I get the correct size and hi-res pixmap. Slide the window over to my external standard-res monitor and it redraws with the standard res pixmap. On Windows, I don't have a hi-res monitor. I'm faking it by setting Change the size of all items to Larger 150%. That's another way to say, Make my large monitor small :) Not ideal, and it's not 2x, so I don't really expect the 2x icons. What I DO expect is the QWindow::devicePixelRatio() might return 1.5, but all I get is 1.0 at all settings of size of all items. I found this: http://doc-snapshot.qt-project.org/qt5-5.4/highdpi.html Since I'm on Windows 8.1 I should be in Per-Monitor DPI Aware mode. It seems like I shouldn't have to intervene in order to get resolution-independent pixel drawing. If I do this before creating my QApplication instance: qputenv(QT_DEVICE_PIXEL_RATIO, 2) then I get 2.0 from devicePixelRatio(), as expected. I also get my hi-res icons. If I do this instead: qputenv(QT_DEVICE_PIXEL_RATIO, 1.5) then devicePixelRatio returns 1.0, not 1.5. And it doesn't seem like I should have to set this myself, anyway. Thanks for any insight you might be able to offer! -John Weeks ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] What is Qt.red for in QML?
Rectangle {
...
color: red // works
color: Qt.red // does not work Unable to assign int to QColor
}
Why? What is Qt.red for then?
Thanks
___
Interest mailing list
Interest@qt-project.org
http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] What is Qt.red for in QML?
you can use the string version
color: 'red'
or rgba value
color: Qt.rgba(1,0,0,1)
On Feb 5, 2015, at 6:07 PM, Jason H jh...@gmx.com wrote:
Rectangle {
...
color: red // works
color: Qt.red // does not work Unable to assign int to QColor
}
Why? What is Qt.red for then?
Thanks
___
Interest mailing list
Interest@qt-project.org
http://lists.qt-project.org/mailman/listinfo/interest
___
Interest mailing list
Interest@qt-project.org
http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] hi-res drawing on Windows
I don't know why that variable exists. It's useless as far as I can tell. Maybe it means that you are being scaled? I use Screen.pixelDensity. Which varies as you think it should, but is spec'd in px per mm, not DPI. That pixelRatio is either 1 or 0, I don't think it is ever in between. In theory on a 2x device the pixelDenisty will be 2x the 1x. Meanwhile pixel ratio is: old (10yr) monitor: 4.x Samsung Note 2: 10.x Moto X: 16.x Sent: Thursday, February 05, 2015 at 5:29 PM From: John Weeks j...@wavemetrics.com To: interest@qt-project.org interest@qt-project.org Subject: [Interest] hi-res drawing on Windows Is there a comprehensive overview of drawing for monitors at various resolutions on Windows? I am trying to get our application to work correctly on a hi-res monitor on Windows. In particular, I have a QToolButton-derived class that makes a button that is just the icon, with no visible frame. It overrides sizeHint(), maximumSize() and paintEvent() to do this. Instances of the button are given icons from PNG resources that have both standard and @2x versions. One point of this class is to size the button based on the size of the icon. Thus, sizeHint() and maximumSize() both return iconSize(). In the paintEvent(), I get the icon out of the button using icon(), get the QWindow for the window hosting the button and then use QIcon::pixmap(QWindow *, iconSize(), ...) to get the appropriate QPixmap to draw. On Macintosh this works great. On my 5k iMac I get the correct size and hi-res pixmap. Slide the window over to my external standard-res monitor and it redraws with the standard res pixmap. On Windows, I don't have a hi-res monitor. I'm faking it by setting Change the size of all items to Larger 150%. That's another way to say, Make my large monitor small :) Not ideal, and it's not 2x, so I don't really expect the 2x icons. What I DO expect is the QWindow::devicePixelRatio() might return 1.5, but all I get is 1.0 at all settings of size of all items. I found this: http://doc-snapshot.qt-project.org/qt5-5.4/highdpi.html Since I'm on Windows 8.1 I should be in Per-Monitor DPI Aware mode. It seems like I shouldn't have to intervene in order to get resolution-independent pixel drawing. If I do this before creating my QApplication instance: qputenv(QT_DEVICE_PIXEL_RATIO, 2) then I get 2.0 from devicePixelRatio(), as expected. I also get my hi-res icons. If I do this instead: qputenv(QT_DEVICE_PIXEL_RATIO, 1.5) then devicePixelRatio returns 1.0, not 1.5. And it doesn't seem like I should have to set this myself, anyway. Thanks for any insight you might be able to offer! -John Weeks ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] hi-res drawing on Windows
On Feb 5, 2015, at 3:03 PM, Jason H jh...@gmx.com wrote: int That pixelRatio is either 1 or 0, I don't think it is ever in between. Well, during development of my button class, when I had bugs :) I saw QPixmap return devicePixelRatio between 1.0 and 2.0. Maybe that's just QPixmap, though. -John Weeks ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] Custom QQuickItem with Mouse area
Hi, I'm trying to create a custom QItem by enabling flag ItemHasContent to true and defining the updatePaintNode() function. It work well and it's fast even for large number of item, 2d points to create a shape. But the mouse area for those draw item are the whole bounding rectangle containing the item. Is there a way to create a mask image of the rendered item to filter mouse event based on the Item draw pixel? or is there a better way to only trigger mouse event only on Item draw area (alpha 1)? Thanks, Jerome ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Flat Light Style How?
The Qt Quick Enterprise Controls Styles module allows custom styling for Qt Quick Enterprise Controls. I want standard controls to be styled too... I thought that it would style all controls, not just the enterprise ones as seen in https://www.youtube.com/watch?v=wMs1pSZMnG0 about 2:00 in. The page you directed me to only lists: CircularGaugeStyle DelayButtonStyle DialStyle GaugeStyle PieMenuStyle StatusIndicatorStyle ToggleButtonStyle TumblerStyle I hope there are more styles than that? Sent: Thursday, February 05, 2015 at 11:59 AM From: Agocs Laszlo laszlo.ag...@theqtcompany.com To: Jason H jh...@gmx.com, interest@qt-project.org interest@qt-project.org Subject: Re: [Interest] Flat Light Style How? Hi, See http://doc.qt.io/QtQuickEnterpriseControls/qtquickenterprisecontrolsstyles-index.html regarding switching styles. Cheers, Laszlo From: interest-bounces+laszlo.agocs=theqtcompany@qt-project.org interest-bounces+laszlo.agocs=theqtcompany@qt-project.org on behalf of Jason H jh...@gmx.com Sent: Thursday, February 5, 2015 5:52 PM To: interest@qt-project.org Subject: [Interest] Flat Light Style How? I have a commercial license and I can not find any info on how to use Flat Light style. Can someone clue me in? Thanks! ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] Flat Light Style How?
I have a commercial license and I can not find any info on how to use Flat Light style. Can someone clue me in? Thanks! ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Flat Light Style How?
Hi, See http://doc.qt.io/QtQuickEnterpriseControls/qtquickenterprisecontrolsstyles-index.html regarding switching styles. Cheers, Laszlo From: interest-bounces+laszlo.agocs=theqtcompany@qt-project.org interest-bounces+laszlo.agocs=theqtcompany@qt-project.org on behalf of Jason H jh...@gmx.com Sent: Thursday, February 5, 2015 5:52 PM To: interest@qt-project.org Subject: [Interest] Flat Light Style How? I have a commercial license and I can not find any info on how to use Flat Light style. Can someone clue me in? Thanks! ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] double-buffering, quality drop
On Thursday 05 February 2015 10:30:04 Alexander Semke wrote: Am Mittwoch, 4. Februar 2015, 11:22:15 schrieben Sie: not sure how the graphicsitem comes into all of this, but no you cant draw on it. Well, we use QGraphicsScene/View with QGraphicsItems. you can draw on a QGraphicsWidget or you can derive from QGraphicsItem and draw in its paint() method. The Curve-class is already derived from QGraphicsItem and I reimplement the paint()-function. As you suggested, I use the QPainter passed to this function to draw onto a QPixmap. Once I'm done with this I want to call painter-drawPixmap() to draw on the QGraphicsItem... Also, by making the painter to paint on the pixmap with painter.begin(pixmap) I get the warning QPainter is already active - the painter is already initialized/prepared for the graphics item. Any other ideas? I think you misinterpret (no offense intended) the concept of QGraphicsScene/View and QGraphicsItem. In a short and very simplified way: QGraphicsItem is just a container for the information about what and how to draw (position, brush, pen, etc). QGraphicsScene is manages these items. The actual drawing is done/induced by QGraphicsView. It creates a QPainter and (via QGraphicsScene) calls the paint() function of the items. The painter does not paint onto an item but is initialized to draw on the views drawing area. If you have several view attached to your scene, each view will call the item's paint() function as needed with its own painter. When you call painter.begin(pixmap) you misuse this painter therefore the warning. If you want to manage the painting by internally creating a pixmap you are doing something similar to what happens when you enable caching with QGraphicsItem::setCacheMode(QGraphicsItem::ItemCoordinateCache). I think you should create a separate painter for painting on your internal pixmap and use the supplied painter to paint() to the draw the pixmap (on the view). You might also have a look at http://www.qcustomplot.com. They are doing something similar as you. -- Reinhardt Behm ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Installing on a headless server
On Thursday 05 February 2015 21:04:34 Jason H wrote: I need to install Qt (Enterprise) on a headless server (CentOS) (I use -platform minimal) . There is only the GUI installer. How can I get Qt installed on the server so I can generate reports? --OR-- How can I build my package for distribution (incl deps) to the headless server? You'll have better luck compiling from sources yourself. -- Thiago Macieira - thiago.macieira (AT) intel.com Software Architect - Intel Open Source Technology Center ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] What is Qt.red for in QML?
On Thu, Feb 5, 2015 at 3:33 PM, Jérôme Godbout jer...@bodycad.com wrote: you can use the string version color: 'red' or rgba value color: Qt.rgba(1,0,0,1) Doesn't answer Jason's question, I assume it is some historical oddity. ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] What is Qt.red for in QML?
Sorry read too fast the original post, try to print it, if the int is 0, I would guess it's an indexer for rgba values of some sort. May be wrong on this not near my computer to test On Feb 5, 2015, at 8:29 PM, Ian Monroe i...@monroe.nu wrote: On Thu, Feb 5, 2015 at 3:33 PM, Jérôme Godbout jer...@bodycad.com wrote: you can use the string version color: 'red' or rgba value color: Qt.rgba(1,0,0,1) Doesn't answer Jason's question, I assume it is some historical oddity. ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] onGestureStarted we can grab(), what about release?
Hi, I’m being faced with a situation where a custom knob is layed out inside nested flickables. My custom knob touch handling is made with a MultiPointTouchArea to allow multiple knob interactions. To avoid the gesture being grabbed by the flickables where is layed into, I call gesture.grab() onGestureStarted. The problem is that, when the touch terminates, it isn’t released unless I tap in another element outside. If I don’t do that, the gesture will keep assigned to that particular knob and this is an awkward and not welcome behaviour. I couldn’t find a gesture release on documentation. Maybe i’m missing something here. Does anyone has a clue on how to avoid this problem? Thanks in advance. Regards, Nuno Santos ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Flat Light Style How?
Oh thanks! So immedautely, I notice issues. Any control that has text (TextField, Button) is not properly accounting for a specified pointSize. How do I inherit from a flat style for a button? Sent: Thursday, February 05, 2015 at 12:11 PM From: Agocs Laszlo laszlo.ag...@theqtcompany.com To: Jason H jh...@gmx.com Cc: interest@qt-project.org interest@qt-project.org Subject: Re: [Interest] Flat Light Style How? QT_QUICK_CONTROLS_STYLE applies to all controls. Don't be misled by the fact that the page is for enterprise controls. Cheers, Laszlo From: Jason H jh...@gmx.com Sent: Thursday, February 5, 2015 6:06 PM To: Agocs Laszlo Cc: interest@qt-project.org Subject: Re: [Interest] Flat Light Style How? The Qt Quick Enterprise Controls Styles module allows custom styling for Qt Quick Enterprise Controls. I want standard controls to be styled too... I thought that it would style all controls, not just the enterprise ones as seen in https://www.youtube.com/watch?v=wMs1pSZMnG0 about 2:00 in. The page you directed me to only lists: CircularGaugeStyle DelayButtonStyle DialStyle GaugeStyle PieMenuStyle StatusIndicatorStyle ToggleButtonStyle TumblerStyle I hope there are more styles than that? Sent: Thursday, February 05, 2015 at 11:59 AM From: Agocs Laszlo laszlo.ag...@theqtcompany.com To: Jason H jh...@gmx.com, interest@qt-project.org interest@qt-project.org Subject: Re: [Interest] Flat Light Style How? Hi, See http://doc.qt.io/QtQuickEnterpriseControls/qtquickenterprisecontrolsstyles-index.html regarding switching styles. Cheers, Laszlo From: interest-bounces+laszlo.agocs=theqtcompany@qt-project.org interest-bounces+laszlo.agocs=theqtcompany@qt-project.org on behalf of Jason H jh...@gmx.com Sent: Thursday, February 5, 2015 5:52 PM To: interest@qt-project.org Subject: [Interest] Flat Light Style How? I have a commercial license and I can not find any info on how to use Flat Light style. Can someone clue me in? Thanks! ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Additional output from QtCore
On Thursday 05 February 2015 16:22:40 Valery Kotov wrote: Greetings everybody! I'm looking for a piece of advice. Let me describe the problem. We have QTimer which emits a signal each N seconds. The timer has queued connection between timeout signal and sltTimeout slot. The slot has some output (to identify if the signal was emitted). Why is it queued? You're adding a delay of one full event loop processing after the timer fires, which already happens inside the event loop. For some time we have everything working perfectly fine: timer emit signal each N seconds and sltTimeout printouts appeared each N seconds. At some moment in time we stop receiving them, but other traces from the process are available. Unfortunately, as far as connection is queued we can't really say if the signal was emitted but was not handled. Is there any way to get any additional information from QtQore about it's internal message queue? I think it could give us some intuition why we missed QTimer event. Could you point at some modules or classes in qtbase which can give me an impression about what is going on inside qt? I would really appreciate any advises from your side. You can do that if you write a testcase. With QtTest, you can use the -vs option to print all signal emissions. Another option is to just put a breakpoint and debug inside QtCore. In any case, verify whether the timer is still alive. And drop the queue, since it's not really necessary... -- Thiago Macieira - thiago.macieira (AT) intel.com Software Architect - Intel Open Source Technology Center ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] Installing on a headless server
I need to install Qt (Enterprise) on a headless server (CentOS) (I use -platform minimal) . There is only the GUI installer. How can I get Qt installed on the server so I can generate reports? --OR-- How can I build my package for distribution (incl deps) to the headless server? ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Qt 5 Creator (Mac) Debugger should use the system python executable
On Thu, Feb 05, 2015 at 02:42:05AM +0100, René J.V. Bertin wrote: On Wednesday February 04 2015 23:44:25 André Pönitz wrote: Hi, The solution is to start LLDB, and use the Python it links to implicitly by using the LLDB 'script' command, instead of hoping that the system Python is the right one. I haven't looked at the Creator code for a while, but doesn't it launch Python with a .py file? Not anymore. It's of course not impossible to replace that with a sequence llbd script run our script but that doesn't strike me as very elegant either. It doesn't do that either. Andre' ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Wrong app name on android
Yes. I checked the application android:label=NameHere and it is correct. But I still get project as the application label in the phone's (launcher/home screen/app list). When I say it does not match I mean to say that label=NameHere does not match what is in the phone. Thanks. Sent: Thursday, February 05, 2015 at 2:58 PM From: Harri Pasanen ha...@mpaja.com To: Jason H jh...@gmx.com Cc: interest@qt-project.org Subject: Re: [Interest] Wrong app name on android Just to clarify, are you talking about the name that appears below the icon in Android launcher? Have you checked what name is in the phone app settings? Manifest and xml are the same thing to me, AndroidManifest.xml, so I don't quite parse your sentence below either... Harri On 05/02/2015 20:26, Jason H wrote: I've checked the manifest The correct value is there... and uninstalled/reinstalled and it still does not match what is in the XML. I pushed it via the debugger - but other people who download it from the app store have the same problem. Sent: Thursday, February 05, 2015 at 10:54 AM From: Harri Pasanen ha...@mpaja.com To: interest@qt-project.org Subject: Re: [Interest] Wrong app name on android On 05/02/2015 16:48, Jason H wrote: So I have an app name in the Application: Application Name field of the manifest viewer. But when I deploy it, it only comes up with the Qt project name (project in project.pro) How do I get the version on the phone to match the Application name? Hmm... I don't recall exact details, but I believe I edited the manifest by hand, in application android:label=NameHere ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Installing on a headless server
We have built Qt 5.1.1 - Qt 5.3.2 from GIT sources on CentOS 6.x. The Installer does not work for us, even on desktop machines. I believe it is tested primarily for Ubuntu. ( I could be wrong on that one.) We will be making our first attempt at a Qt 5.4 on CentOS 7 later today or tomorrow. Karl On Feb 5, 2015, at 2:04 PM, Jason H jh...@gmx.com wrote: I need to install Qt (Enterprise) on a headless server (CentOS) (I use -platform minimal) . There is only the GUI installer. How can I get Qt installed on the server so I can generate reports? --OR-- How can I build my package for distribution (incl deps) to the headless server? ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Wrong app name on android
On Thu, Feb 5, 2015 at 10:14 PM, Jason H jh...@gmx.com wrote: Yes. I checked the application android:label=NameHere and it is correct. But I still get project as the application label in the phone's (launcher/home screen/app list). When I say it does not match I mean to say that label=NameHere does not match what is in the phone. Thanks. Sent: Thursday, February 05, 2015 at 2:58 PM From: Harri Pasanen ha...@mpaja.com To: Jason H jh...@gmx.com Cc: interest@qt-project.org Subject: Re: [Interest] Wrong app name on android Just to clarify, are you talking about the name that appears below the icon in Android launcher? Have you checked what name is in the phone app settings? Manifest and xml are the same thing to me, AndroidManifest.xml, so I don't quite parse your sentence below either... Harri On 05/02/2015 20:26, Jason H wrote: I've checked the manifest The correct value is there... and uninstalled/reinstalled and it still does not match what is in the XML. I pushed it via the debugger - but other people who download it from the app store have the same problem. Sent: Thursday, February 05, 2015 at 10:54 AM From: Harri Pasanen ha...@mpaja.com To: interest@qt-project.org Subject: Re: [Interest] Wrong app name on android On 05/02/2015 16:48, Jason H wrote: So I have an app name in the Application: Application Name field of the manifest viewer. But when I deploy it, it only comes up with the Qt project name (project in project.pro) How do I get the version on the phone to match the Application name? Hmm... I don't recall exact details, but I believe I edited the manifest by hand, in application android:label=NameHere Hi Jason, Do you mean something like this: QTBUG-41655 Kind regards, Robert ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Wrong app name on android
Hmm... I seem to have android:label attribute both for application and activity It may well be the latter that is shown under the icon. On 05/02/2015 21:14, Jason H wrote: Yes. I checked the application android:label=NameHere and it is correct. But I still get project as the application label in the phone's (launcher/home screen/app list). When I say it does not match I mean to say that label=NameHere does not match what is in the phone. Thanks. Sent: Thursday, February 05, 2015 at 2:58 PM From: Harri Pasanen ha...@mpaja.com To: Jason H jh...@gmx.com Cc: interest@qt-project.org Subject: Re: [Interest] Wrong app name on android Just to clarify, are you talking about the name that appears below the icon in Android launcher? Have you checked what name is in the phone app settings? Manifest and xml are the same thing to me, AndroidManifest.xml, so I don't quite parse your sentence below either... Harri On 05/02/2015 20:26, Jason H wrote: I've checked the manifest The correct value is there... and uninstalled/reinstalled and it still does not match what is in the XML. I pushed it via the debugger - but other people who download it from the app store have the same problem. Sent: Thursday, February 05, 2015 at 10:54 AM From: Harri Pasanen ha...@mpaja.com To: interest@qt-project.org Subject: Re: [Interest] Wrong app name on android On 05/02/2015 16:48, Jason H wrote: So I have an app name in the Application: Application Name field of the manifest viewer. But when I deploy it, it only comes up with the Qt project name (project in project.pro) How do I get the version on the phone to match the Application name? Hmm... I don't recall exact details, but I believe I edited the manifest by hand, in application android:label=NameHere ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Qt 5 Creator (Mac) Debugger should use the system python executable
On Thu, Feb 05, 2015 at 10:33:09AM +0100, René J.V. Bertin wrote: On Thursday February 05 2015 08:22:09 Harri Pasanen wrote: llbd script run our script but that doesn't strike me as very elegant either. If it is a long running script, it seems quite elegant to me, as I solves the correct python selection as André mentioned. Maybe elegant wasn't the best choice of words. The context is of course a GUI interface that communicates with lldb through some kind of python interface. Depending on how exactly that communication is set up (and python started) it might not be straightforward to replace the python call with a call to lldb that then needs to be sent a command to start the python interpreter, which may not be prepared to handle a non-interactive terminal. I haven't had time to look at what exactly goes on in Creator's code. ... But for instance, I tried `lldb -o script` and on OS X that got me in a Python-prompt-printing dead loop which required me to killall -1 lldb. On Linux lldb reacts differently: I get into the Python interpreter after sending an EOF (^D), but then every Python expression I tried led to a core dump. I would take that as an indication that this is not the approach taken. It does seem however that sys.executable points to the correct python executable (checked only on Linux). Invoking sys.executable inside LLDB does not reliably produce a Python executable usable with that LLDB. Not even on Linux. Which leads me to another thought I can't verify ATM because not on a Mac: does Qt Creator allow selection of the lldb executable to use? Yes. You don't need a Mac to verify. You can have use different executables on all supported platforms. It's not at all uncommon to have different versions, and of course each will require the use of its own python executable. The point of invoking LLDB first is to not have to care where its Python support infrastructure lives. Andre' ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
