[Interest] QtThread
Hi I have been reading about QtThread and there seems to be a lot of discussion about how to correctly use this class. i.e. should developers derive from QtThread or provide an QObject and move this object to a thread. The examples provided with Qt5 derive from QtThread whereas there is a lot of chatter on the web saying this is not the correct way. Can anyone provide some definitive answers on how developers are to use QtThread? Thanks ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] QtThread
Hi, As Andrey pointed out, there is not a single way. But if you want to use a QThread for running QObjects with its event loop, the most simple way is not to subclass, and moveToThread. This is well explained here: http://blog.qt.digia.com/blog/2010/06/17/youre-doing-it-wrong/ http://mayaposch.wordpress.com/2011/11/01/how-to-really-truly-use-qthreads-the-full-explanation/ Cheers, Etienne 2014/1/13 Chaser chaser.and...@gmail.com -BEGIN PGP SIGNED MESSAGE- Hash: SHA256 Hi I have been reading about QtThread and there seems to be a lot of discussion about how to correctly use this class. i.e. should developers derive from QtThread or provide an QObject and move this object to a thread. The examples provided with Qt5 derive from QtThread whereas there is a lot of chatter on the web saying this is not the correct way. Can anyone provide some definitive answers on how developers are to use QtThread? Thanks ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest You must know that QThread is not the thread itself, but it's a class for manipulation of the thread. So, the QThread object stays in main thread. Derive from QThread and moveToThread() are two correctly use-case of QThread. IMHO, deriving from QThread is more complicated, you must understand, how to create objects and run code in new thread, but not in QThread's parent thread. -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.22 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iF4EAREIAAYFAlLTs1AACgkQZxvOZ+bTdZheVAD9GOwA8IsVjZZJXdCL/KR2u+lH 9rGA8qeZ1mY/zIqel1UA/3pB+SLGHzzA89oxF6jpcFcD0/HEAfaf2VoVVe7/n+vj =6OTm -END PGP SIGNATURE- ___ 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] Storing QMaps in a QVariant
2014/1/10 Alejandro Exojo aex...@modpow.es: In Qt 5.2 I see Q_DECLARE_ASSOCIATIVE_CONTAINER_METATYPE, where it even clarifies that all of the Qt associative containers already have built-in support and that if the key/value are already supported, QVariant should store everything. However, I'm not getting a QMapquint8, quint16 inside a QVariant::fromValue. I've tried to use the different macros provided, and even add a call to qRegisterMetaType, just in case. I also tried a typedef. I think I'm missing something obvious, but I don't see what. Here is what I got: http://pastie.org/8620095 Thank you. I was indeed, missing something obvious: QVariant stored the values just fine, it was the call to QSettings that was triggering warnings at runtime about load() and save(). A simple call to qRegisterMetaTypeStreamOperatorsQMapquint8,quint16(); made QVariant save things in the configuration file and retrieving them back. -- Alejandro Exojo Piqueras ModpoW, S.L. Technova LaSalle | Sant Joan de la Salle 42 | 08022 Barcelona | www.modpow.es ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] [Android] Profiling QML application
-Original Message- From: interest-bounces+kai.koehne=digia@qt-project.org [mailto:interest-bounces+kai.koehne=digia@qt-project.org] On Behalf Of Ben Lau Sent: Sunday, January 12, 2014 5:53 PM To: interest@qt-project.org Subject: [Interest] [Android] Profiling QML application Hi , I got a performance problem in loading QML in Android . Therefore I would like to run profiler on QML itself. However, when I launch the QML profiler within QT creator. The process hang on : D/Qt (14973): qtcpserverconnection.cpp:173 (voidQTcpServerConnection::listen()): QML Debugger: Waiting for connection on port 61428... That's with Qt Creator 3.0? Please file a bug ... Anyhow, as a 'workaround' you should be able to profile by launching the app yourself with e.g. -qmljsdebugger=port:61428,block argument, and then connect from Qt Creator with Analyze-Qml Profiler(external) ... Regards Kai ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] Question about reading glsl shader source from a QResource using compression
Hi all,
I've been looking at the Scene Graph - Graph example application included
with Qt5.2.0, to see how to create a custom shader material for Qt Quick.
In linenode.cpp, there is a LineShader class, where the shaders are read
like so:
const char *vertexShader() const {
QResource r(:/scenegraph/graph/shaders/line.vsh);
Q_ASSERT(r.isValid());
return (const char *) r.data();
}
const char *fragmentShader() const {
QResource r(:/scenegraph/graph/shaders/line.fsh);
Q_ASSERT(r.isValid());
return (const char *) r.data();
}
In the documentation for QResource, it says that the data returned by
r.data may be compressed. So is this way of reading the shader source code
safe at all times? Shouldn't it check with r.isCompressed and if so,
uncompress? Is there some assumption here that such small text files aren't
compressed?
Cheers,
Ola
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Re: [Interest] Qt laptop stickers
On 07.01.14 05:51, ??? ??? wrote: Hello. Does anyone have a Qt laptop stickers? Can you sell me some? Best regards, Nick ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest Hmm, I think I went out of them. At least haven't seen them for a while. If a DIGIA person is listening. Would be great to have some general merchandising of Qt. E.g. Qt shirts, Qt mugs, Qt stickers, Qt-Teddy, Qt-Mousepad, etc... There should be some companies around which offer these kind of merchandise-services. DIGIA owns the copyright to the Qt-logo and trademark, as far as I know. / juergen ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] [QQuickView] rendering not started
hi all, trying to use a QQuickView from a plugin context (from a QMacNativeWidget), i'm sometimes having problems that the initial rendering is not performed. unfortunately this seems to depend on the plugin host. trying to debug this issue by tracing the signals, i've found out the following: * the QQuickView rendering does not seem to be triggered: the beforeRendering signal is not emitted * i've called QQuickWindow::update() from a lambda function connected to QQuickView::statusChanged() in the case of QQuickView::Ready. in order to schedule the rendering of another frame. but this does not seem to happen (not beforeRendering signal is emitted). * the GUI interaction works: mouse/keyboard events are handled correctly. once the size of the root item is changed from the qml context, the QQV behaves well. is there any way to force the start of the rendering? or any idea how to debug this further? thanks in advance, tim ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] QtThread
On 13 January 2014 18:26, Etienne Sandré-Chardonnal etienne.san...@m4x.org wrote: Hi, As Andrey pointed out, there is not a single way. But if you want to use a QThread for running QObjects with its event loop, the most simple way is not to subclass, and moveToThread. This is well explained here: http://blog.qt.digia.com/blog/2010/06/17/youre-doing-it-wrong/ http://mayaposch.wordpress.com/2011/11/01/how-to-really-truly-use-qthreads-the-full-explanation/ To balance things out, here's a direct response to Etienne's first link: http://woboq.com/blog/qthread-you-were-not-doing-so-wrong.html The correct method depends on what you want to achieve. I wrote (most of) this page to compare/contrast all the different ways to do parallel processing in Qt, and try to help readers choose the best way for their application: http://qt-project.org/doc/qt-5/threads-technologies.html (suggestions for improvements are welcome!) Regards, Sze-Howe ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Qt laptop stickers
On 1/13/2014 6:57 AM, Juergen Bocklage-Ryannel wrote: On 07.01.14 05:51, ??? ??? wrote: Hello. Does anyone have a Qt laptop stickers? Can you sell me some? Best regards, Nick ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest Hmm, I think I went out of them. At least haven't seen them for a while. If a DIGIA person is listening. Would be great to have some general merchandising of Qt. E.g. Qt shirts, Qt mugs, Qt stickers, Qt-Teddy, Qt-Mousepad, etc... There should be some companies around which offer these kind of merchandise-services. DIGIA owns the copyright to the Qt-logo and trademark, as far as I know. / juergen I'm pretty sure there was merchandising when Nokia owned Qt. I still have my (really rather cool) Qt pen, which I think I picked up at a past SIGGRAPH, that has the qt.nokia.com URL on it. I would agree: It would be nice to have some product merchandising (pens, mouse pads, stickers, etc.) to be able to show our pride in this fantastic product. ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] QtThread
Thanks for the link! You are right, in fact only the moveToThread(this) approach should be really avoided. 2014/1/13 Sze Howe Koh szehowe@gmail.com To balance things out, here's a direct response to Etienne's first link: http://woboq.com/blog/qthread-you-were-not-doing-so-wrong.html ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] QtThread
On segunda-feira, 13 de janeiro de 2014 11:35:12, Chaser wrote: Derive from QThread and moveToThread() are two correctly use-case of QThread. Just to be clear: those are two correct use-cases but they can't be used at the same time. Option 1: derive from QThread (and override run(), writing your code there) Option 2: (derive from QObject) and moveToThread() -- Thiago Macieira - thiago.macieira (AT) intel.com Software Architect - Intel Open Source Technology Center signature.asc Description: This is a digitally signed message part. ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Question about reading glsl shader source from a QResource using compression
Presence and level of resource compression depends on command line
parameters passed to the resource compiler. IIRC compression is disabled by
default so all resources are stored as is unless you explicitly tell the
resource compiler to compress them and correct way of retrieving resource
data depends on your project settings.
On Jan 13, 2014 4:26 PM, Ola Røer Thorsen o...@silentwings.no wrote:
Hi all,
I've been looking at the Scene Graph - Graph example application included
with Qt5.2.0, to see how to create a custom shader material for Qt Quick.
In linenode.cpp, there is a LineShader class, where the shaders are read
like so:
const char *vertexShader() const {
QResource r(:/scenegraph/graph/shaders/line.vsh);
Q_ASSERT(r.isValid());
return (const char *) r.data();
}
const char *fragmentShader() const {
QResource r(:/scenegraph/graph/shaders/line.fsh);
Q_ASSERT(r.isValid());
return (const char *) r.data();
}
In the documentation for QResource, it says that the data returned by
r.data may be compressed. So is this way of reading the shader source code
safe at all times? Shouldn't it check with r.isCompressed and if so,
uncompress? Is there some assumption here that such small text files aren't
compressed?
Cheers,
Ola
___
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http://lists.qt-project.org/mailman/listinfo/interest
___
Interest mailing list
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Re: [Interest] Question about reading glsl shader source from a QResource using compression
On 13 January 2014 13:25, Ola Røer Thorsen o...@silentwings.no wrote: In the documentation for QResource, it says that the data returned by r.data may be compressed. So is this way of reading the shader source code safe at all times? Shouldn't it check with r.isCompressed and if so, uncompress? Is there some assumption here that such small text files aren't compressed? I think the example is just doing it wrong, it should instead load the resource file contents using QFile into two QByteArrays into the ctor and then return the QByteArrays' contents there. -- Giuseppe D'Angelo ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] ios+audio
Hi, has someone a example on how play a audio file with IOS? I have setter QTPLUGIN in the pro, but in the qml when i start the Multimedia player i have mute and no message error. Suggest? Nicola ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Qt5.2-android: Fail to debugging app in qtcreator 3.0
After some investigation of QtActivityDelegate.java and the log file, I think the problem is: pong file /data/local/tmp/qt/debug-pong-org.qtproject.example.testAndroid was not created before time out. I also checked the file system in userdata-qemu.img of the android virtual device and found that the socket file /data/data/org.qtproject.example.testAndroid/debug-socket has been created by gdbserver and ping file /data/data/org.qtproject.example.testAndroid/debug-ping has also been created. But pong file /data/local/tmp/qt/debug-pong-org.qtproject.example.testAndroid doesn't exist, even the directory /data/local/tmp/qt doesn't exist. So who is responsible for writing the pong file? Why the pong file can't be created ? Any suggestion will be appreciated! On Sun, Jan 12, 2014 at 12:04 PM, Liang Jian jianlian...@gmail.com wrote: Hello everyone, Recently I want to write apps for andriod using qt5.2, I wrote a very simple widget based test app using qtcreator 3.0 in a ubuntu 12.04 x64 machine, the app run perfectly in the android virtual device, but I failed to debugging the app in the android virtual device, the message in 'Application Output' panel of qtcreator tell me: Debugging starts Unable to start 'org.qtproject.example.testAndroid'.Debugging has failed Debugging has finished Then I check the log message by 'adb logcat log.txt', it seems that Qt time out when waiting for pong file due to an exception has occurred at org.qtproject.qt5.android.bindings.QtActivity.loadApplication(), and the exception was thrown in QtActivityDelegate.startApplication(). but I don't know what to do. I have attached the log file, I hope this log file maybe helpful to you to find the issue in my environment, thanks! BTW, Is it possible for me to debug into QtActivityDelegate.java by qtcreator? Best Regards Liang Jian ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
