Re: [Interest] Windows VST plugin based on Qt
Hi Nuno, I strongly suggest to download Dependency Walker utility, and use that to test loading your DLL on Windows. Also, there are dozens of VST examples available, maybe you start with one that works, then extend it with Qt or whatever. Regards, Tony Sent: Tuesday, 19 May 2015 4:27 PM Hi, I�m trying to build a VST plugin based on Qt. A VST plugin is a framework for creating audio processing and instrument plugins. It provides an api that one should follows. The result is a dynamic library that will be loaded by the host (dll on windows case, bundle on mac case). I have done it successfully on Mac (with still a lot of tests to perform and the need for correct deploy) and now i�m trying on Windows. On Windows i�m being faced with some dll loading problems. If I build the plugin without link Qt at all (CONFIG -= qt), the plugin is recognized by the host. Otherwise it isn�t. I want to use Qt, specially QML for UI. There are simpler ways of doing this, but I love Qt and I want my code to be the most transversal as possible. I have been suggested that this problems is due to the loading path of the libraries. I suggested solution relies in using /DELAYLOAD I have tried to perform /DELAYLOAD:Qt5Core.dll and the other three libs started by icu, and then using the SetDllDirectory to the path I have the deployed plugin. Still, the host is unable to load the plugin correctly. Can someone give me an insight on how to do this on windows? Thanks, Regards, Nuno ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] Windows VST plugin based on Qt
Hi, I’m trying to build a VST plugin based on Qt. A VST plugin is a framework for creating audio processing and instrument plugins. It provides an api that one should follows. The result is a dynamic library that will be loaded by the host (dll on windows case, bundle on mac case). I have done it successfully on Mac (with still a lot of tests to perform and the need for correct deploy) and now i’m trying on Windows. On Windows i’m being faced with some dll loading problems. If I build the plugin without link Qt at all (CONFIG -= qt), the plugin is recognized by the host. Otherwise it isn’t. I want to use Qt, specially QML for UI. There are simpler ways of doing this, but I love Qt and I want my code to be the most transversal as possible. I have been suggested that this problems is due to the loading path of the libraries. I suggested solution relies in using /DELAYLOAD I have tried to perform /DELAYLOAD:Qt5Core.dll and the other three libs started by icu, and then using the SetDllDirectory to the path I have the deployed plugin. Still, the host is unable to load the plugin correctly. Can someone give me an insight on how to do this on windows? Thanks, Regards, Nuno ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Windows VST plugin based on Qt
Creating a VST is certainly possible, though you will need to do some extra steps. a) you need an application object created inside your plugin. The easiest to do so is to create a new thread (when the first instance is created or even on show(), not during plugins loading), which will initialize everything, otherwise you will get into troubles due to two different event loops interfering each other. b) Be careful about multiple instances, you will need to handle this properly (Q(Core)Application is singleton, so check for existence c) Try to not interfere with other VST plugins which might use Qt as well, potentially a different version even. Then the order of plugins loaded might make things fall apart. One step to take care of this is to namespace your Qt build d) as a start you can put Qt libraries and plugins also into your VST folder, the host will load a bit slower but for testing that is ok. Later you might want to use manifests or static linking. Another option would be to create a thin layer, which then loads your plugin from another location where you have arranged all dlls properly. d) things I probably forgot... Unfortunately I have my VST test code at home and cannot give more guidance right now. If there is a need for it, feel free to remind me to send some snippets to you. VST2 or VST3? BR, Maurice -Original Message- From: interest-bounces+maurice.kalinowski=theqtcompany.com@qt- project.org [mailto:interest- bounces+maurice.kalinowski=theqtcompany@qt-project.org] On Behalf Of Nuno Santos Sent: Dienstag, 19. Mai 2015 08:27 To: Interests Qt Subject: [Interest] Windows VST plugin based on Qt Hi, I’m trying to build a VST plugin based on Qt. A VST plugin is a framework for creating audio processing and instrument plugins. It provides an api that one should follows. The result is a dynamic library that will be loaded by the host (dll on windows case, bundle on mac case). I have done it successfully on Mac (with still a lot of tests to perform and the need for correct deploy) and now i’m trying on Windows. On Windows i’m being faced with some dll loading problems. If I build the plugin without link Qt at all (CONFIG -= qt), the plugin is recognized by the host. Otherwise it isn’t. I want to use Qt, specially QML for UI. There are simpler ways of doing this, but I love Qt and I want my code to be the most transversal as possible. I have been suggested that this problems is due to the loading path of the libraries. I suggested solution relies in using /DELAYLOAD I have tried to perform /DELAYLOAD:Qt5Core.dll and the other three libs started by icu, and then using the SetDllDirectory to the path I have the deployed plugin. Still, the host is unable to load the plugin correctly. Can someone give me an insight on how to do this on windows? Thanks, Regards, Nuno ___ 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] Windows VST plugin based on Qt
Maurice, Thanks for your reply. There is certainly a lot to absorve from your answer. But I want to focus on small steps for now. The problem so far in Windows is that when I put the dlls on the VST plugins dir the host is not able to detect it (by host I mean Ableton Live and/or Bitwig for example). There are other test hosts such as VST Host and VST Analyser which are able to load the plugin but I think the dll directory problem fits like a glove here, since I need to specify manually where is the plugin I want to load and, therefore he knows that the remaining dlls are in the same dir. If I don’t link with Qt at all, Ableton Live recognizes the plugin. What should I do? I feel my hands tied… I would definitely remind you! Thanks so much. Regards, Nuno On 19/05/2015, at 08:05, Kalinowski Maurice maurice.kalinow...@theqtcompany.com wrote: Creating a VST is certainly possible, though you will need to do some extra steps. a) you need an application object created inside your plugin. The easiest to do so is to create a new thread (when the first instance is created or even on show(), not during plugins loading), which will initialize everything, otherwise you will get into troubles due to two different event loops interfering each other. b) Be careful about multiple instances, you will need to handle this properly (Q(Core)Application is singleton, so check for existence c) Try to not interfere with other VST plugins which might use Qt as well, potentially a different version even. Then the order of plugins loaded might make things fall apart. One step to take care of this is to namespace your Qt build d) as a start you can put Qt libraries and plugins also into your VST folder, the host will load a bit slower but for testing that is ok. Later you might want to use manifests or static linking. Another option would be to create a thin layer, which then loads your plugin from another location where you have arranged all dlls properly. d) things I probably forgot... Unfortunately I have my VST test code at home and cannot give more guidance right now. If there is a need for it, feel free to remind me to send some snippets to you. VST2 or VST3? BR, Maurice -Original Message- From: interest-bounces+maurice.kalinowski=theqtcompany.com@qt- project.org [mailto:interest- bounces+maurice.kalinowski=theqtcompany@qt-project.org] On Behalf Of Nuno Santos Sent: Dienstag, 19. Mai 2015 08:27 To: Interests Qt Subject: [Interest] Windows VST plugin based on Qt Hi, I’m trying to build a VST plugin based on Qt. A VST plugin is a framework for creating audio processing and instrument plugins. It provides an api that one should follows. The result is a dynamic library that will be loaded by the host (dll on windows case, bundle on mac case). I have done it successfully on Mac (with still a lot of tests to perform and the need for correct deploy) and now i’m trying on Windows. On Windows i’m being faced with some dll loading problems. If I build the plugin without link Qt at all (CONFIG -= qt), the plugin is recognized by the host. Otherwise it isn’t. I want to use Qt, specially QML for UI. There are simpler ways of doing this, but I love Qt and I want my code to be the most transversal as possible. I have been suggested that this problems is due to the loading path of the libraries. I suggested solution relies in using /DELAYLOAD I have tried to perform /DELAYLOAD:Qt5Core.dll and the other three libs started by icu, and then using the SetDllDirectory to the path I have the deployed plugin. Still, the host is unable to load the plugin correctly. Can someone give me an insight on how to do this on windows? Thanks, Regards, Nuno ___ 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] Error when compiling Qt 5.5.0 beta for Max OS X 10.8
Hi all, I'm trying to compile Qt 5.5.0 beta for Mac OS X 10.8, on Mac OS X 10.10. This is the configuration line I'm using. ./configure -prefix /Developer/libs/qt-5.5.0_beta -qt-zlib -qt-libpng -qt-libjpeg -nomake tests -nomake examples -platform macx-clang-32 -opensource -confirm-license -sdk macosx10.8 The compilation stops with the following error [...] cd testlib/ ( test -e Makefile || /Users/mauceri/work/dev/libs/qt-everywhere- opensource-src-5.5.0-beta/qtbase/bin/qmake /Users/mauceri/work/dev/libs/qt-every where-opensource-src-5.5.0-beta/qtbase/src/testlib/testlib.pro -o Makefile ) /Applications/Xcode.app/Contents/Developer/usr/bin/make -f Makefile /Applications/Xcode.app/Contents/Developer/usr/bin/make -f Makefile.Debug all /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/u sr/bin/clang -c -pipe -arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk -mmacosx-version-min=10.7 -F/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/D eveloper/Library/Frameworks -g -fvisibility=hidden -fvisibility-inlines-hidden - std=c++11 -stdlib=libc++ -Wall -W -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DQT_NO_CAST_TO_ASCII -DQT_NO_CAST_FROM_ASCII -DQT_ NO_DATASTREAM -DHAVE_XCTEST -DQT_BUILD_TESTLIB_LIB -DQT_BUILDING_QT -DQT_ASCII_CAST_WARNINGS -DQT_MOC_COMPAT -DQT_USE_QSTRINGBUILDER -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x05 -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_CORE_LIB -I. -I../../include -I../../include/QtTest -I../../include/QtTest/5.5.0 -I../../include/QtTest/5.5.0/QtTest -I../../lib/QtCore.framework/Headers -I../../lib/QtCore.framework/Headers/5.5.0 -I../../lib/QtCore.framework/Headers/5.5.0/QtCore -I.moc/debug -I../../mkspecs/macx-clang-32 -F/Users/mauceri/work/dev/libs/qt-everywhere-opensource-src-5.5.0-beta/qtbase/lib qxctestlogger.mm -o .obj/debug/qxctestlogger.o qxctestlogger.mm:129:27: error: property 'description' not found on object of type 'id' [NSDate date].description.UTF8String); ^ qxctestlogger.mm:250:17: warning: property 'testObjectName' requires method 'testObjectName' to be defined - use @synthesize, @dynamic or provide a method implementation in this class implementation [-Wobjc-property-implementation] @implementation QtTestLibTest ^ qxctestlogger.mm:75:41: note: property declared here @property (nonatomic, retain) NSString* testObjectName; ^ qxctestlogger.mm:250:17: warning: property 'testObjectName' requires method 'setTestObjectName:' to be defined - use @synthesize, @dynamic or provide a method implementation in this class implementation [-Wobjc-property-implementation] @implementation QtTestLibTest ^ qxctestlogger.mm:75:41: note: property declared here @property (nonatomic, retain) NSString* testObjectName; ^ qxctestlogger.mm:250:17: warning: property 'testFunctionName' requires method 'testFunctionName' to be defined - use @synthesize, @dynamic or provide a method implementation in this class implementation [-Wobjc-property-implementation] @implementation QtTestLibTest ^ qxctestlogger.mm:76:41: note: property declared here @property (nonatomic, retain) NSString* testFunctionName; ^ qxctestlogger.mm:250:17: warning: property 'testFunctionName' requires method 'setTestFunctionName:' to be defined - use @synthesize, @dynamic or provide a method implementation in this class implementation [-Wobjc-property-implementation] @implementation QtTestLibTest ^ qxctestlogger.mm:76:41: note: property declared here @property (nonatomic, retain) NSString* testFunctionName; ^ 4 warnings and 1 error generated. make[4]: *** [.obj/debug/qxctestlogger.o] Error 1 make[3]: *** [debug-all] Error 2 make[2]: *** [sub-testlib-make_first] Error 2 make[1]: *** [sub-src-make_first] Error 2 make: *** [module-qtbase-make_first] Error 2 Is this a bug or am I doing something wrong? Thanks, Calogero -- Calogero Mauceri Software Engineer Applied Coherent Technology Corporation (ACT) www.actgate.com ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Error when compiling Qt 5.5.0 beta for Max OS X 10.8
Is this a bug or am I doing something wrong? qt-5.5 does not compile on 10.8 out of the box. it is probably going to be fixed before the release (afaict, 10.8 is still supported) tim ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] QProgressBar::reset... when it doesn't
Doesn't look like a bug to me. The description of QProgressBar::reset() says: The progress bar rewinds and shows no progress. Indeterminate progress bars have no progress/value by definition so there's nothing to reset. I admit that setting a non-zero range just to disable a progress bar looks a bit ugly but QProgressBar::reset() works as intended IMHO. On 05/19/2015 08:38 PM, Matthew Woehlke wrote: I have a progress bar used to show that some task is executing. Some times I know how its actual progress, and sometimes I don't. When the task is done, I call QProgressBar::reset(). This is fine if I know the actual progress (value range is non-empty). When I don't (value range = [0, 0]), reset() doesn't work. The problem is that QProgressBar having an empty range, to show the I'm busy but can't show you meaningful progress, trumps the progress bar being reset. Now, I can fix that by also setting a non-empty range, but this feels like a bug. This is with Qt 4.8.6. As I don't have an easy way to check, does anyone know if it has been fixed in Qt 5.x? Does this feel like a bug that should be reported? (I didn't find any existing reports for this issue, at least nothing that mentioned both QProgressBar and reset.) signature.asc Description: OpenPGP digital signature ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Error when compiling Qt 5.5.0 beta for Max OS X 10.8
5.5 Beta does support 10.8, at least CI still covers it. The issue must be related with -platform macx-clang-32, that's unsupported for a while. Regards, Liang On 19 May 2015 at 11:58, Tim Blechmann t...@klingt.org wrote: Is this a bug or am I doing something wrong? qt-5.5 does not compile on 10.8 out of the box. it is probably going to be fixed before the release (afaict, 10.8 is still supported) tim -- http://www.qiliang.net ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] The right way of using QProcess
On Tuesday 19 May 2015 15:29:04 Nuno Santos wrote:
Hi,
I’m calling the function below with a one second interval while my app is
open. The functions executes the command “adb devices
Is there any kind of limitation by the system by the number of calls? I
think my system gets to a point where no more processes can be created:
Chrome starts to hang, QtCreator isn’t able to do make, etc
Sounds like an attack of the zombies (no, really, there must be zombie
process left around)
static QString executeAdbCommand(QStringList arguments)
{
QProcess p;
//p.setReadChannel(QProcess::StandardError);
#ifdef Q_OS_MAC
p.start(QString(%1/adb).arg(QCoreApplication::applicationDirPath()),
arguments); #endif
#ifdef Q_OS_WIN
p.start(adb.exe, arguments);
#endif
//qDebug() Executing adb arguments;
if (!p.waitForStarted())
return ;
if (!p.waitForFinished())
return ;
QString output = p.readAll();
return output;
}
Don't return until waitForFinished() succeeds. That one guarantees wait() has
happened on the process, so we know there is no zombie left.
Is this Qt 5.4? Or are you already trying the 5.5 beta? The way we do wait()
has changed considerably in 5.5, so it might be worth testing the beta to see
if the problem also happens.
--
Thiago Macieira - thiago.macieira (AT) intel.com
Software Architect - Intel Open Source Technology Center
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Re: [Interest] The right way of using QProcess
Thiago,
Thanks for your reply. Yes, this is 5.4.
I will investigate this further by doing some output on the waitForFinished
return result.
I want to avoid installing another toolkit right now (lack of time and lack of
space in my laptop) but I will consider it if the problems persists.
Regards,
Nuno Santos
Founder / CEO / CTO
www.imaginando.pt
+351 91 621 69 62
On 19 May 2015, at 15:58, Thiago Macieira thiago.macie...@intel.com wrote:
On Tuesday 19 May 2015 15:29:04 Nuno Santos wrote:
Hi,
I’m calling the function below with a one second interval while my app is
open. The functions executes the command “adb devices
Is there any kind of limitation by the system by the number of calls? I
think my system gets to a point where no more processes can be created:
Chrome starts to hang, QtCreator isn’t able to do make, etc
Sounds like an attack of the zombies (no, really, there must be zombie
process left around)
static QString executeAdbCommand(QStringList arguments)
{
QProcess p;
//p.setReadChannel(QProcess::StandardError);
#ifdef Q_OS_MAC
p.start(QString(%1/adb).arg(QCoreApplication::applicationDirPath()),
arguments); #endif
#ifdef Q_OS_WIN
p.start(adb.exe, arguments);
#endif
//qDebug() Executing adb arguments;
if (!p.waitForStarted())
return ;
if (!p.waitForFinished())
return ;
QString output = p.readAll();
return output;
}
Don't return until waitForFinished() succeeds. That one guarantees wait() has
happened on the process, so we know there is no zombie left.
Is this Qt 5.4? Or are you already trying the 5.5 beta? The way we do wait()
has changed considerably in 5.5, so it might be worth testing the beta to see
if the problem also happens.
--
Thiago Macieira - thiago.macieira (AT) intel.com http://intel.com/
Software Architect - Intel Open Source Technology Center
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Re: [Interest] qmake command usage
On 5/19/2015 8:11 AM, Dale Marchand wrote: Can someone explain why the following line in a .pro file fails to create a softlink: system(ln -s /home/marchand/test.xml /home/marchand/test2.xml) but when the output is stored in a variable, the link is created as expected: THROW_AWAY_VAR=$$system(ln -s /home/marchand/test.xml /home/marchand/test2.xml) This is using qmake bundled with Qt 5.4.1. Perhaps it quotes the latter for you but expects the first to be quoted? : system(ln -s /home/marchand/test.xml /home/marchand/test2.xml) Unfortunately no. Tried that and still no luck without the variable assignment. Dale ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Error diring make install for iOS build
I have same issue installing Qt 5.5 Unfortunately I cannot verify if a couple of Qt 5.5 Beta patches fix Xcode malformed project crashes and qrc file not found errors. https://bugreports.qt.io/browse/QTBUG-45966 https://bugreports.qt.io/browse/QTBUG-44654 Hopefully a Qt 5.5 RC candidate will be coming soon. git clone https://git.gitorious.org/qt/qt5.git qt5 cd qt5 git checkout dev perl init-repository git checkout 5.5 git pull git submodule foreach (git checkout 5.5; git pull) ./configure -commercial -confirm-license \ -debug-and-release \ -nomake tests \ -nomake examples \ -qt-zlib -qt-libjpeg -qt-libpng \ -xplatform macx-ios-clang \ -no-sql-mysql -Ed On May 18, 2015, at 3:10 PM, Jason H jh...@gmx.commailto:jh...@gmx.com wrote: While doing a make install for -xplatform macx-ios-clang -release, it installed the QtGUI stuff, but bombed with: === BUILD TARGET xmlpatterns OF PROJECT xmlpatterns WITH CONFIGURATION Release === Check dependencies Code Sign error: No provisioning profiles found: No non–expired provisioning profiles were found. CodeSign error: code signing is required for product type 'Application' in SDK 'iOS 8.3' ** INSTALL FAILED ** The following build commands failed: Check dependencies (1 failure) make[4]: *** [iphoneos-release-install] Error 65 make[3]: *** [iphoneos-install] Error 2 make[2]: *** [sub-xmlpatterns-install_subtargets] Error 2 make[1]: *** [sub-tools-install_subtargets] Error 2 make: *** [module-qtxmlpatterns-install_subtargets] Error 2 How do I get past this? ___ Interest mailing list Interest@qt-project.orgmailto:Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest This email and any files transmitted with it from The Charles Machine Works, Inc. are confidential and intended solely for the use of the individual or entity to which they are addressed. If you have received this email in error please notify the sender. Our company accepts no liability for the contents of this email, or for the consequences of any actions taken on the basis of the information provided, unless that information is subsequently confirmed in writing. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the company. Finally, the recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] The right way of using QProcess
Hi,
I’m calling the function below with a one second interval while my app is open.
The functions executes the command “adb devices
Is there any kind of limitation by the system by the number of calls? I think
my system gets to a point where no more processes can be created: Chrome starts
to hang, QtCreator isn’t able to do make, etc
static QString executeAdbCommand(QStringList arguments)
{
QProcess p;
//p.setReadChannel(QProcess::StandardError);
#ifdef Q_OS_MAC
p.start(QString(%1/adb).arg(QCoreApplication::applicationDirPath()),
arguments);
#endif
#ifdef Q_OS_WIN
p.start(adb.exe, arguments);
#endif
//qDebug() Executing adb arguments;
if (!p.waitForStarted())
return ;
if (!p.waitForFinished())
return ;
QString output = p.readAll();
return output;
}
Nuno
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Re: [Interest] Interest Digest, Vol 44, Issue 51
On 5/18/2015 11:46 PM, interest-requ...@qt-project.org wrote: Can someone explain why the following line in a .pro file fails to create a softlink: system(ln -s /home/marchand/test.xml /home/marchand/test2.xml) but when the output is stored in a variable, the link is created as expected: THROW_AWAY_VAR=$$system(ln -s /home/marchand/test.xml /home/marchand/test2.xml) This is using qmake bundled with Qt 5.4.1. Perhaps it quotes the latter for you but expects the first to be quoted? : system(ln -s /home/marchand/test.xml /home/marchand/test2.xml) Unfortunately no. Tried that and still no luck without the variable assignment. Dale ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] QProgressBar::reset... when it doesn't
I have a progress bar used to show that some task is executing. Some times I know how its actual progress, and sometimes I don't. When the task is done, I call QProgressBar::reset(). This is fine if I know the actual progress (value range is non-empty). When I don't (value range = [0, 0]), reset() doesn't work. The problem is that QProgressBar having an empty range, to show the I'm busy but can't show you meaningful progress, trumps the progress bar being reset. Now, I can fix that by also setting a non-empty range, but this feels like a bug. This is with Qt 4.8.6. As I don't have an easy way to check, does anyone know if it has been fixed in Qt 5.x? Does this feel like a bug that should be reported? (I didn't find any existing reports for this issue, at least nothing that mentioned both QProgressBar and reset.) -- Matthew ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] The right way of using QProcess
Thiago,
I have found the cause. The command binary was not present on the directory
thus, every call was being invoked without the program. It never started, it
never ended.
You were right. It was a zombie attack.
Nuno Santos
Founder / CEO / CTO
www.imaginando.pt
+351 91 621 69 62
On 19 May 2015, at 16:12, Nuno Santos nunosan...@imaginando.pt wrote:
Thiago,
Thanks for your reply. Yes, this is 5.4.
I will investigate this further by doing some output on the waitForFinished
return result.
I want to avoid installing another toolkit right now (lack of time and lack
of space in my laptop) but I will consider it if the problems persists.
Regards,
Nuno Santos
Founder / CEO / CTO
www.imaginando.pt http://www.imaginando.pt/
+351 91 621 69 62
On 19 May 2015, at 15:58, Thiago Macieira thiago.macie...@intel.com
mailto:thiago.macie...@intel.com wrote:
On Tuesday 19 May 2015 15:29:04 Nuno Santos wrote:
Hi,
I’m calling the function below with a one second interval while my app is
open. The functions executes the command “adb devices
Is there any kind of limitation by the system by the number of calls? I
think my system gets to a point where no more processes can be created:
Chrome starts to hang, QtCreator isn’t able to do make, etc
Sounds like an attack of the zombies (no, really, there must be zombie
process left around)
static QString executeAdbCommand(QStringList arguments)
{
QProcess p;
//p.setReadChannel(QProcess::StandardError);
#ifdef Q_OS_MAC
p.start(QString(%1/adb).arg(QCoreApplication::applicationDirPath()),
arguments); #endif
#ifdef Q_OS_WIN
p.start(adb.exe, arguments);
#endif
//qDebug() Executing adb arguments;
if (!p.waitForStarted())
return ;
if (!p.waitForFinished())
return ;
QString output = p.readAll();
return output;
}
Don't return until waitForFinished() succeeds. That one guarantees wait()
has
happened on the process, so we know there is no zombie left.
Is this Qt 5.4? Or are you already trying the 5.5 beta? The way we do wait()
has changed considerably in 5.5, so it might be worth testing the beta to
see
if the problem also happens.
--
Thiago Macieira - thiago.macieira (AT) intel.com http://intel.com/
Software Architect - Intel Open Source Technology Center
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