Re: [Interest] ´ð¸´: how to block run function of QRunnable class
Hi Ken,
Sorry for the confusion - deriving from both QRunnable and QThread is probably
NOT a good idea - you don't want to create your own QThread - just access the
static methods:
// Hack to get around Qt strictness...
class TSleepThread: public QThread
{
public:
static void sleep(unsigned long secs) { QThread::sleep(secs); };
static void msleep(unsigned long msecs) { QThread::msleep(msecs); };
static void usleep(unsigned long usecs) { QThread::usleep(usecs); };
};
then in your QRunnable derived class:
...
TSleepThread::msleep( 20 );
...
Regards,
Tony
From: pengliang(??) [mailto:pengli...@founder.com]
Sent: Tuesday, 19 March 2013 4:46 PM
To: Tony Rietwyk; interest@qt-project.org
Subject: ??: [Interest]´ð¸´: how to block run function of QRunnable class
Hi
I have defined a class derived from Qrunnable and Qthread.
Now, i call sleep in run function, it worked perfect.
Thanks
Ken
_
发件人: interest-bounces+pengliang=founder@qt-project.org
[mailto:interest-bounces+pengliang=founder@qt-project.org] 代表 Tony Rietwyk
发送时间: 2013年3月19日 13:36
收件人: interest@qt-project.org
主题: Re: [Interest]´ð¸´: how to block run function of QRunnable class
Hi Ken,
In Qt 4, you have to define your own override of QThread and expose the
protected static sleep methods. I'm don't know about Qt 5.
Tony
From: interest-bounces+tony=rightsoft.com...@qt-project.org
[mailto:interest-bounces+tony=rightsoft.com...@qt-project.org] On Behalf Of
pengliang(??)
Sent: Tuesday, 19 March 2013 4:22 PM
To: Amogh Kudari
Cc: Interest@qt-project.org
Subject: [Interest] 答复: how to block run function of QRunnable class
Hi
Thank you.
But I check source code of Qt, QthreadPool is derived from Qobject, not Qthread.
Thanks
Ken
_
发件人: Amogh Kudari [mailto:amogh.kuda...@gmail.com]
发送时间: 2013年3月19日 11:53
收件人: pengliang(彭亮)
抄送: Interest@qt-project.org
主题: Re: [Interest] how to block run function of QRunnable class
Hi Pengliang,
I am not pretty sure but it may be possible as QThreadPoolThread is a
friend class of Qrunnable class and
QThreadPoolThread is derived from QThread and QThread has the sleep method.
Hope this helps.
Regards,
Amogh.
On Tue, Mar 19, 2013 at 8:11 AM, pengliang(彭亮) pengli...@founder.com wrote:
Hi all
I don’t know how to block run function several seconds of Qrunnable
class.
Andybody know?
Thanks
Ken
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[Interest] 答复: ´ð¸´: how to block run function of QRunnable class
Hi,
Yes, you method works perfectly too.
But, if Run class derived from Qrunnable and Qthread, is there any problem? Or
is there any potential risk?
Thanks
Ken
发件人: interest-bounces+pengliang=founder@qt-project.org
[mailto:interest-bounces+pengliang=founder@qt-project.org] 代表 Tony Rietwyk
发送时间: 2013年3月19日 14:10
收件人: interest@qt-project.org
主题: Re: [Interest]´ð¸´: how to block run function of QRunnable class
Hi Ken,
Sorry for the confusion - deriving from both QRunnable and QThread is probably
NOT a good idea - you don't want to create your own QThread - just access the
static methods:
// Hack to get around Qt strictness...
class TSleepThread: public QThread
{
public:
static void sleep(unsigned long secs) { QThread::sleep(secs); };
static void msleep(unsigned long msecs) { QThread::msleep(msecs); };
static void usleep(unsigned long usecs) { QThread::usleep(usecs); };
};
then in your QRunnable derived class:
...
TSleepThread::msleep( 20 );
...
Regards,
Tony
From: pengliang(??) [mailto:pengli...@founder.com]
Sent: Tuesday, 19 March 2013 4:46 PM
To: Tony Rietwyk; interest@qt-project.org
Subject: ??: [Interest]´ð¸´: how to block run function of QRunnable class
Hi
I have defined a class derived from Qrunnable and Qthread.
Now, i call sleep in run function, it worked perfect.
Thanks
Ken
发件人: interest-bounces+pengliang=founder@qt-project.org
[mailto:interest-bounces+pengliang=founder@qt-project.org] 代表 Tony Rietwyk
发送时间: 2013年3月19日 13:36
收件人: interest@qt-project.org
主题: Re: [Interest]´ð¸´: how to block run function of QRunnable class
Hi Ken,
In Qt 4, you have to define your own override of QThread and expose the
protected static sleep methods. I'm don't know about Qt 5.
Tony
From: interest-bounces+tony=rightsoft.com...@qt-project.org
[mailto:interest-bounces+tony=rightsoft.com...@qt-project.org] On Behalf Of
pengliang(??)
Sent: Tuesday, 19 March 2013 4:22 PM
To: Amogh Kudari
Cc: Interest@qt-project.org
Subject: [Interest] 答复: how to block run function of QRunnable class
Hi
Thank you.
But I check source code of Qt, QthreadPool is derived from Qobject, not Qthread.
Thanks
Ken
发件人: Amogh Kudari [mailto:amogh.kuda...@gmail.com]
发送时间: 2013年3月19日 11:53
收件人: pengliang(彭亮)
抄送: Interest@qt-project.org
主题: Re: [Interest] how to block run function of QRunnable class
Hi Pengliang,
I am not pretty sure but it may be possible as QThreadPoolThread is a
friend class of Qrunnable class and
QThreadPoolThread is derived from QThread and QThread has the sleep method.
Hope this helps.
Regards,
Amogh.
On Tue, Mar 19, 2013 at 8:11 AM, pengliang(彭亮) pengli...@founder.com wrote:
Hi all
I don’t know how to block run function several seconds of Qrunnable
class.
Andybody know?
Thanks
Ken
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Re: [Interest] opengl graphics system status in 4.8.x?
Hi Thiago, On Monday 18 Mar 2013 15:55:25 Thiago Macieira wrote: On segunda-feira, 18 de março de 2013 20.07.34, Simon St James wrote: Currently, performance is surprisingly good considering we are still using the raster graphics system where everything is plotted pixel by pixel by Qt and then flushed to the canvas after pixel format conversion. However, we suspect that we can get significant gains in rendering speed by writing a Qt graphics system that uses HTML5 Canvas drawing primitives. [snip] So I was wondering whether using Qt's opengl graphics system is feasible? I heard it was experimental and not pixel-perfect, but I've not heard any reports that that matched mine, which makes me wonder if I just got very unlucky The OpenGL graphics system in Qt 4 is considered a done experiment, leading to the conclusion that an OpenGL graphics system is a very bad idea. The code itself never left experimental state and is considered flawed. Do not use it. The experiment itself was a success, since it concluded that we should do something entirely different for performance using OpenGL. That's the Qt 5 / Qt Quick 2 scene graph. Sounds pretty decisive, then :) Thanks for the information! Si ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] opengl graphics system status in 4.8.x?
Am 19.03.2013 um 08:01 schrieb Simon St James kdede...@etotheipiplusone.com: ... The experiment itself was a success, since it concluded that we should do something entirely different for performance using OpenGL. That's the Qt 5 / Qt Quick 2 scene graph. Sounds pretty decisive, then :) Thanks for the information! What does seem to work however - also in Qt 4.8 - is e.g. a QGraphicsView on top of a QGLWidget: some (most?) paint operations are then OpenGL accelerated. Also using a simple QPainter on top of a QGLWidget does accelerate certain (most?) paint operations. You have to be careful though not to mix the GL state induced by the QPainter and your own GL state (setup with your own modelview matrix etc.). See beginNativePaint and friends in the Qt docs. Not sure whether that helps in your context. Cheers, Oliver ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] qt3D and qt5 status
2013/3/10 qtnext qtn...@gmail.com: I wants to port an existing apps from Qt4 to Qt5. I suppose that all is easily portable, but I use qt3D c++ scenegraph to render my opengl stuff. It seems that qt3D is not included in qt5 trunk, but has anybody tryed to compile qt3D C++ with qt5 ? Does it works for basic feature ? I just want to point out the following post: http://www.kdab.com/kdab-contributions-to-qt-5-0-part-5/ In which you can read: For Qt 5.1, KDAB is additionally assuming maintainership of the Qt3D and QtX11Extras modules. I don't know exactly if it will be considered stable enough in 5.1. I see very little activity in the repository (last commit that seems to modify actual code and not just buildsystem, license, typos, etc., seems to be from February 7th), but I don't know if that's any real indication of anything or not. Let's hope for the best. -- 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] qt3D and qt5 status
The last commit from the repository says: 5.2 is the expected release version, so set it already. We have to be a little more patient. ;-) Olivier Boucard. De : Alejandro Exojo aex...@modpow.es À : Interest@qt-project.org Envoyé le : Mardi 19 mars 2013 9h30 Objet : Re: [Interest] qt3D and qt5 status 2013/3/10 qtnext qtn...@gmail.com: I wants to port an existing apps from Qt4 to Qt5. I suppose that all is easily portable, but I use qt3D c++ scenegraph to render my opengl stuff. It seems that qt3D is not included in qt5 trunk, but has anybody tryed to compile qt3D C++ with qt5 ? Does it works for basic feature ? I just want to point out the following post: http://www.kdab.com/kdab-contributions-to-qt-5-0-part-5/ In which you can read: For Qt 5.1, KDAB is additionally assuming maintainership of the Qt3D and QtX11Extras modules. I don't know exactly if it will be considered stable enough in 5.1. I see very little activity in the repository (last commit that seems to modify actual code and not just buildsystem, license, typos, etc., seems to be from February 7th), but I don't know if that's any real indication of anything or not. Let's hope for the best. -- 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 ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] Qt5 Visual Studio Add-In 1.2.1 RC
Hi, Release candidate of Qt5 Visual Studio Add-In 1.2.1 in now available for download here. http://origin.releases.qt-project.org/digia_vsaddin/ Change list of modifications available here http://qt.gitorious.org/qt-labs/vstools/blobs/master/Qt4VS2003/Qt4VSAddin/Changes-1.2.1 Final version is scheduled to be released after Easter, first week of April. BR, Ismo -- Ismo Haataja Senior Software Specialist - Digia, Qt Visit us on: http://qt.digia.com ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] scale all fonts
Is it possible to apply a scaling to all font sizes used in an application? I can see Qt is doing the right thing by converting point sizes to pixel sizes in accordance with the DPI of the display. Now suppose I want to override the DPI, or redefine point to be other than 1/72 (achieves the same). Is this possible? thanks Hamish ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] opengl graphics system status in 4.8.x?
On 03/18/2013 09:07 PM, Simon St James wrote: Hi all, I am currently working on emscripten-qt (http://vps2.etotheipiplusone.com:30176/redmine/projects/emscripten-qt/wiki/Demos/), a project that uses Emscripten (https://github.com/kripken/emscripten/wiki) to compile Qt 4.8.x to Javascript and run in a browser using an HTML5 canvas for rendering. Currently, performance is surprisingly good considering we are still using the raster graphics system where everything is plotted pixel by pixel by Qt and then flushed to the canvas after pixel format conversion. However, we suspect that we can get significant gains in rendering speed by writing a Qt graphics system that uses HTML5 Canvas drawing primitives. However however, it has been suggested that maybe using Qt's own opengl graphics system would be an even more performant approach. I started investigating this by running stock Qt apps with stock Qt packages (on Kubuntu 12.04, Intel HD Graphics card) with -graphicssystem opengl, and every app I tried gave only a black window, except for some more visually complex which were mostly black with a few coloured rectangles scattered about When I compiled Qt myself and tried with that, I noticed that using KDE's default Oxygen style with -graphicssystem opengl actually triggered an assertion within Qt[1], and while forcing the style to plastique no longer triggered it, I still just had a black window. Other OpenGL apps work fine. So I was wondering whether using Qt's opengl graphics system is feasible? I heard it was experimental and not pixel-perfect, but I've not heard any reports that that matched mine, which makes me wonder if I just got very unlucky True, it's experimental and not pixel-perfect, and not really well maintained at all for the desktop platforms. You could try to see if export QT_GL_SWAPBUFFER_PRESERVE=1 fixes the issue with the black windows though. Were you planning on using WebGL? It might be possible, but I'd probably sooner recommend you to use HTML5 Canvas (i.e. a custom paint engine for QPainter). -- Samuel ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] scale all fonts
Den 19-03-2013 11:27, Hamish Moffatt skrev: Is it possible to apply a scaling to all font sizes used in an application? I can see Qt is doing the right thing by converting point sizes to pixel sizes in accordance with the DPI of the display. Now suppose I want to override the DPI, or redefine point to be other than 1/72 (achieves the same). Is this possible? Well, yes and no. You can't say a widget uses standard pixel size plus X. You can set a standard font on QApplication with the size you want: QFont font; font.setPixelSize(23); QApplication::setFont(font); That part is easy enough. But in places where you have custom drawing with other sizes, you need to do the same kind of thing: QFont f; // This is the standard font f.setPixelSize(f.pixelSize() + 3); setFont(f); // Or use f with the painter You can listen for font changes with the changeEvent() in widgets. If you use the QWidget::setFont(), this is necessary. If you just use it in the painter, it's not necessary. In all text based widgets with rich text, you can use font size=+3 and then it just works. With style sheets, you can't do this. In QML you can do sort of the same things. But I assumed this was a QWidget based question. Bo. -- Bo Thorsen, European Qt Manager, Integrated Computer Solutions ICS - Delivering World-Class Applications for Embedded Mobile Devices http://ics.com/services ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] scale all fonts
Il 19/03/2013 11:27, Hamish Moffatt ha scritto:
Is it possible to apply a scaling to all font sizes used in an application?
I can see Qt is doing the right thing by converting point sizes to pixel
sizes in accordance with the DPI of the display. Now suppose I want to
override the DPI, or redefine point to be other than 1/72 (achieves the
same). Is this possible?
HI I used this way:
I defined a dynamic stylesheet
qApp-setStyleSheet(*[menuHStyle = \480x272\] { font: Bold 8pt
\Currier New\; }\n
*[menuHStyle = \\] { font: Bold 14pt \Helvetica\;
}\n
*[menuStyle = \480x272\ ] { font: Bold 6pt \Currier
New\; }\n
*[menuStyle = \\] { font: Bold 11pt \Helvetica\;
}\n
*[voiceStyle = \480x272\] { font: 8pt \Currier
New\; }\n
*[voiceStyle = \\] { font: 14pt \Helvetica\;
}\n);
Than I match screen size with style, and I set in widget my dynamic style.
ui-ButNetworkPreferences -setProperty(menuStyle,
Monitor::screenSizeName());
thanks
Hamish
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Re: [Interest] scale all fonts
On 19 Mar 2013, at 11:27 AM, Hamish Moffatt wrote: Is it possible to apply a scaling to all font sizes used in an application? I can see Qt is doing the right thing by converting point sizes to pixel sizes in accordance with the DPI of the display. Now suppose I want to override the DPI, or redefine point to be other than 1/72 (achieves the same). Is this possible? Unless you are on MacOS, you can override the DPI system-wide. X11 has multiple ways (xorg.conf, and startx -- -dpi 72 or whatever); in Windows you can do it in the display control panel. ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] gstreamer is not enabled in Qt5
I couldnot find gstreamer 0.10.38..So I installed 0.10.36 as gstreamer should be 1.0 but still getting the same error as mentioned below. Any pointers to enable gstreamer in configure verbose output? Br, Ramakanth From: interest-bounces+ramakanthreddy_kesireddy=mahindrasatyam@qt-project.org [interest-bounces+ramakanthreddy_kesireddy=mahindrasatyam@qt-project.org] on behalf of Thiago Macieira [thiago.macie...@intel.com] Sent: Friday, March 15, 2013 8:31 PM To: interest@qt-project.org Subject: Re: [Interest] gstreamer is not enabled in Qt5 On sexta-feira, 15 de março de 2013 11.55.30, Ramakanthreddy_Kesireddy wrote: Please find the attached configure command line and gstreamer error as attached. Thank you. That was not a cross-compilation. The command that failed and the error were: g++ -c -pipe -O2 -Wall -W -fPIE -I../../../mkspecs/linux-g++ -I. - I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib/arm-linux- gnueabihf/glib-2.0/include -I/usr/include/libxml2 -o gstreamer.o gstreamer.cpp In file included from gstreamer.cpp:43:0: /usr/include/gstreamer-0.10/gst/interfaces/propertyprobe.h:20:20: fatal error: global.h: No such file or directory Looks like it's a gstreamer error. I have 0.10.38 here and there's no include to global.h nor a file called global.h. Please check your installation. -- Thiago Macieira - thiago.macieira (AT) intel.com Software Architect - Intel Open Source Technology Center DISCLAIMER: This email (including any attachments) is intended for the sole use of the intended recipient/s and may contain material that is CONFIDENTIAL AND PRIVATE COMPANY INFORMATION. Any review or reliance by others or copying or distribution or forwarding of any or all of the contents in this message is STRICTLY PROHIBITED. If you are not the intended recipient, please contact the sender by email and delete all copies; your cooperation in this regard is appreciated. ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] qt3D and qt5 status
On Tuesday 19 March 2013 09:20:02 BOUCARD Olivier wrote: The last commit from the repository says: 5.2 is the expected release version, so set it already. We have to be a little more patient. ;-) Apologies I've only just spotted this thread. This was discussed on the development@ list back in February. Please take a look at this mail: http://lists.qt-project.org/pipermail/development/2013-February/009853.html Hopefully that explains where we are at and what the broad plans are. Cheers, Sean Olivier Boucard. De : Alejandro Exojo aex...@modpow.es À : Interest@qt-project.org Envoyé le : Mardi 19 mars 2013 9h30 Objet : Re: [Interest] qt3D and qt5 status 2013/3/10 qtnext qtn...@gmail.com: I wants to port an existing apps from Qt4 to Qt5. I suppose that all is easily portable, but I use qt3D c++ scenegraph to render my opengl stuff. It seems that qt3D is not included in qt5 trunk, but has anybody tryed to compile qt3D C++ with qt5 ? Does it works for basic feature ? I just want to point out the following post: http://www.kdab.com/kdab-contributions-to-qt-5-0-part-5/ In which you can read: For Qt 5.1, KDAB is additionally assuming maintainership of the Qt3D and QtX11Extras modules. I don't know exactly if it will be considered stable enough in 5.1. I see very little activity in the repository (last commit that seems to modify actual code and not just buildsystem, license, typos, etc., seems to be from February 7th), but I don't know if that's any real indication of anything or not. Let's hope for the best. -- Dr Sean Harmer | sean.har...@kdab.com | Senior Software Engineer Klarälvdalens Datakonsult AB, a KDAB Group company Tel. Sweden (HQ) +46-563-540090, USA +1-866-777-KDAB(5322) KDAB - Qt Experts - Platform-independent software solutions ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] qt3D and qt5 status
I have missed that too. Sounds great to me. Olivier. De : Sean Harmer sean.har...@kdab.com À : interest@qt-project.org Envoyé le : Mardi 19 mars 2013 13h24 Objet : Re: [Interest] qt3D and qt5 status On Tuesday 19 March 2013 09:20:02 BOUCARD Olivier wrote: The last commit from the repository says: 5.2 is the expected release version, so set it already. We have to be a little more patient. ;-) Apologies I've only just spotted this thread. This was discussed on the development@ list back in February. Please take a look at this mail: http://lists.qt-project.org/pipermail/development/2013-February/009853.html Hopefully that explains where we are at and what the broad plans are. Cheers, Sean Olivier Boucard. De : Alejandro Exojo aex...@modpow.es À : Interest@qt-project.org Envoyé le : Mardi 19 mars 2013 9h30 Objet : Re: [Interest] qt3D and qt5 status 2013/3/10 qtnext qtn...@gmail.com: I wants to port an existing apps from Qt4 to Qt5. I suppose that all is easily portable, but I use qt3D c++ scenegraph to render my opengl stuff. It seems that qt3D is not included in qt5 trunk, but has anybody tryed to compile qt3D C++ with qt5 ? Does it works for basic feature ? I just want to point out the following post: http://www.kdab.com/kdab-contributions-to-qt-5-0-part-5/ In which you can read: For Qt 5.1, KDAB is additionally assuming maintainership of the Qt3D and QtX11Extras modules. I don't know exactly if it will be considered stable enough in 5.1. I see very little activity in the repository (last commit that seems to modify actual code and not just buildsystem, license, typos, etc., seems to be from February 7th), but I don't know if that's any real indication of anything or not. Let's hope for the best. -- Dr Sean Harmer | sean.har...@kdab.com | Senior Software Engineer Klarälvdalens Datakonsult AB, a KDAB Group company Tel. Sweden (HQ) +46-563-540090, USA +1-866-777-KDAB(5322) KDAB - Qt Experts - Platform-independent software solutions ___ 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] scale all fonts
On 19/03/2013 10:55 PM, Rutledge Shawn wrote: On 19 Mar 2013, at 11:27 AM, Hamish Moffatt wrote: Is it possible to apply a scaling to all font sizes used in an application? I can see Qt is doing the right thing by converting point sizes to pixel sizes in accordance with the DPI of the display. Now suppose I want to override the DPI, or redefine point to be other than 1/72 (achieves the same). Is this possible? Unless you are on MacOS, you can override the DPI system-wide. X11 has multiple ways (xorg.conf, and startx -- -dpi 72 or whatever); in Windows you can do it in the display control panel. I'd like to do it in the application, not system-wide. Can I override the DPI that Qt has detected from the OS somehow? Hamish ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] Qt5 Visual Studio Add-In 1.2.1 RC
On 3/19/2013 5:38 AM, Haataja Ismo wrote: Hi, Release candidate of Qt5 Visual Studio Add-In 1.2.1 in now available for download here. http://origin.releases.qt-project.org/digia_vsaddin/ Change list of modifications available here http://qt.gitorious.org/qt-labs/vstools/blobs/master/Qt4VS2003/Qt4VSAddin/Changes-1.2.1 Final version is scheduled to be released after Easter, first week of April. Thanks, but if I read the mod list properly, this one only gurantees not to overwrite an existing Qt4 add-in. The problem is that we need a Qt4 add-in that will work with VS 2012. The current Qt4 add-in only supports VS up to 2010. Or am I missing something here? ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] QThread and sleep
Hi folks!
Today some doubt has ocurred on my office. Suppose that for some
reason we need to sleep a thread (not the main thread) for some time
(eg. 100 ms). The QThread::wait(int) provides similar functionality
to the POSIX pthread_join() and this don't will sleep the target
thread, but the caller thread.
Call the QThread::wait(int) from the target thread is forbidden
(according to line 651 of qthread_unix.cpp).
Furthermore, is wrong call QThread::wait(int) except for
synchronously thread termination with QThread::terminate() ? ( I know,
isn't so healthy use QThread::terminate() ) QThread::wait(int) is a
busy wait, right?
The attached code illustrate the question.
My immediate solution is: create some MyThread class inherited of
QThread just for expose the QThread::*sleep(unsigned long) methods and
create some slot or Q_INVOKABLE method on Worker to call these exposed
methods. Anyone propose some more elegant solution?
Thanks!
Hugo Drumond Jacob
class Worker : public QObject {
Q_OBJECT
public:
explicit Worker(QObject *parent = 0);
Q_INVOKABLE void doSomething();
};
Worker::Worker(QObject *parent) : QObject(parent) {
}
void Worker::doSomething() {
while(true) {
qDebug() QDateTime::currentDateTime().toString(Worker: dd/MM/ hh:mm:ss.zzz);
}
}
int main(int argc, char *argv[]) {
QCoreApplication a(argc, argv);
Worker* w = new Worker();
QThread* workerThread = new QThread();
workerThread-start();
w-moveToThread(workerThread);
qDebug() Main: Calling doSomething with invokeMethod.;
QMetaObject::invokeMethod(w, doSomething, Qt::QueuedConnection);
//This force the main thread to wait
qDebug() Main: Calling wait(100) of WorkerThread.;
workerThread-wait(100);
qDebug() Main: QDateTime::currentDateTime().toString(dd/MM/ hh:mm:ss.zzz);
return a.exec();
}
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Re: [Interest] how to block run function of QRunnable class
Hello Tony!
I have something of a side question, below.
On Tue, Mar 19, 2013 at 2:09 AM, Tony Rietwyk t...@rightsoft.com.au wrote:
Hi Ken,
...
// Hack to get around Qt strictness...
class TSleepThread: public QThread
{
public:
static void sleep(unsigned long secs) { QThread::sleep(secs); };
static void msleep(unsigned long msecs) { QThread::msleep(msecs); };
static void usleep(unsigned long usecs) { QThread::usleep(usecs); };
};
...
I've done this hack before to unprotect QThread::sleep. But for the
life of me I cannot figure out why QThread:: sleep is protected (or, at
least, why there isn't some other unprotected static sleep somewhere).
A cross-platform sleep (in a cross-platform framework, at that). What's
not to like?
But seriously, does anyone know what the motivation for making sleep
protected might have been?
...
Regards,
Tony
Thanks.
K. Frank
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Re: [Interest] how to block run function of QRunnable class
Op 19-3-2013 14:57, K. Frank schreef:
Hello Tony!
I have something of a side question, below.
On Tue, Mar 19, 2013 at 2:09 AM, Tony Rietwyk t...@rightsoft.com.au wrote:
Hi Ken,
...
// Hack to get around Qt strictness...
class TSleepThread: public QThread
{
public:
static void sleep(unsigned long secs) { QThread::sleep(secs); };
static void msleep(unsigned long msecs) { QThread::msleep(msecs); };
static void usleep(unsigned long usecs) { QThread::usleep(usecs); };
};
...
I've done this hack before to unprotect QThread::sleep. But for the
life of me I cannot figure out why QThread:: sleep is protected (or, at
least, why there isn't some other unprotected static sleep somewhere).
A cross-platform sleep (in a cross-platform framework, at that). What's
not to like?
But seriously, does anyone know what the motivation for making sleep
protected might have been?
I'm not sure, probably to discourage its usage. Anyway, in Qt 5, there
now are static public member functions sleep and usleep in QThread.
André
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Re: [Interest] how to block run function of QRunnable class
Hi André! On Tue, Mar 19, 2013 at 10:11 AM, André Somers an...@familiesomers.nl wrote: Op 19-3-2013 14:57, K. Frank schreef: Hello Tony! I have something of a side question, below. ... A cross-platform sleep (in a cross-platform framework, at that). What's not to like? But seriously, does anyone know what the motivation for making sleep protected might have been? I'm not sure, probably to discourage its usage. Anyway, in Qt 5, there now are static public member functions sleep and usleep in QThread. Thanks, good answer. I haven't moved to Qt 5 yet, so thanks for noting that sleep has become unprotected. For the time being with Qt 4 I guess I'll just keep on unprotecting sleep, à la Tony, and not feel guilty about it. André Thanks. K. Frank ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] how to block run function of QRunnable class
On Tuesday 19 March 2013 15:11:03 André Somers wrote:
Op 19-3-2013 14:57, K. Frank schreef:
Hello Tony!
I have something of a side question, below.
On Tue, Mar 19, 2013 at 2:09 AM, Tony Rietwyk t...@rightsoft.com.au
wrote:
Hi Ken,
...
// Hack to get around Qt strictness...
class TSleepThread: public QThread
{
public:
static void sleep(unsigned long secs) { QThread::sleep(secs); };
static void msleep(unsigned long msecs) { QThread::msleep(msecs);
};
static void usleep(unsigned long usecs) { QThread::usleep(usecs);
};
};
...
I've done this hack before to unprotect QThread::sleep. But for the
life of me I cannot figure out why QThread:: sleep is protected (or, at
least, why there isn't some other unprotected static sleep somewhere).
A cross-platform sleep (in a cross-platform framework, at that). What's
not to like?
But seriously, does anyone know what the motivation for making sleep
protected might have been?
I'm not sure, probably to discourage its usage. Anyway, in Qt 5, there
now are static public member functions sleep and usleep in QThread.
Sleep being public tends to make users think it could be called from anywhere
(not only from within the thread) which might have sideeffects. Thus,
overwriting QThread implies you're doing sth. non standard and you know what
you are doing.
Frank
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[Interest] QGridLayout does not update
Dear all,
I am encountering the following issue using QGridLayout in a widget.
The QGridLayout is currently used for displaying labels along a grid with
two columns, in a subclassed QWidget. This QWidget was set as the widget of
a QSCrollArea, the QScrollArea is the content of a QDockWidget.
1) In the QWidget constructor, I create the QGridLayout and populate it
with dummy labels for testing. This works:
gridLayout = new QGridLayout(this);
setLayout(gridLayout);
for(int i=0;i15;i++)
{
QLabel * nameWidget = new QLabel(Testing!!, this);
gridLayout-addWidget(nameWidget, i, 0);
QLabel * statusWidget = new QLabel(N/A, this);
gridLayout-addWidget(statusWidget, i, 1);
}
This works as expected, especially the column size is adjusted to the
QLabel widths
2) Then in a setServerNames slot of the QWidget, I do:
QLayoutItem *child;
while ((child = gridLayout-takeAt(0)) != 0) {
delete child-widget();
delete child;
}
if(serverList.size()==0)
return;
for(int i=0;iserverList.size();i++)
{
QLabel * nameWidget = new QLabel(serverList[i], this);
gridLayout-addWidget(nameWidget, i, 0);
QLabel * statusWidget = new QLabel(N/A, this);
gridLayout-addWidget(statusWidget, i, 1);
}
When the slot is called, the layout is not refreshed : the column width
stays as it was adjusted in the constructor, so some of the QLabels are
cropped, while there is still plenty of space on the right.
Worse, if the layout is not populated in the constructor, then when the
slot is called, nothing is displayed, likely because the layout is not
refreshed, and sizes are null.
I'm using Qt 4.8.3 under Windows
Any idea?
Thanks!
Etienne
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Re: [Interest] how to block run function of QRunnable class
Hi Frank! On Tue, Mar 19, 2013 at 10:24 AM, Frank Hemer fr...@hemer.org wrote: On Tuesday 19 March 2013 15:11:03 André Somers wrote: Op 19-3-2013 14:57, K. Frank schreef: ... A cross-platform sleep (in a cross-platform framework, at that). What's not to like? But seriously, does anyone know what the motivation for making sleep protected might have been? I'm not sure, probably to discourage its usage. Anyway, in Qt 5, there now are static public member functions sleep and usleep in QThread. Sleep being public tends to make users think it could be called from anywhere (not only from within the thread) which might have sideeffects. Thus, overwriting QThread implies you're doing sth. non standard and you know what you are doing. I don't really follow the thinking here. On both windows and linux I can call the native sleep. I can call it from the single main thread of a single-threaded program, from a QThread, from a pthread, from a windows thread, from a std::thread, and all it does is pause the thread of execution from which it's called. I don't see anything I would call side effects. I would think that Qt's sleep should be just a cross-platform wrapper / normalizer for the native calls. (I also don't see why sleep should be a static member of QThread, rather than a free function, other than maybe a java-esque desire to use classes rather than namespaces.) No matter. Tony's hack works for Qt 4, and sleep is public in Qt 5. I'm just curious -- sometimes there's a method to the madness ... Frank Thanks for the explanation. K. Frank ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] QGridLayout does not update
Tried, with no success. Surprisingly, if I directly set my QWidget as the QDockWidget content, it works. But if I put a QScrollArea as the QDockWidget content, and my QWidget as QScrollArea content, it does not work. Something is wrong with the QScrollArea Etienne 2013/3/19 preeteesh kakkar preeteesh.kak...@gmail.com Try calling gridlayout-update() and see if that helps? ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] QGridLayout does not update
Ah, I think I got an idea from the docs. Apparently, one cannot modify the layout of a widget after it has been set as a QScrollArea content. Damned... this prevents me from dynamically changing the content of the dock without recreating everything at each update Etienne void QScrollArea::setWidget ( QWidgetqthelp://com.trolltech.qt.481/qdoc/qwidget.html * *widget* ) Sets the scroll area's *widget*. The *widget* becomes a child of the scroll area, and will be destroyed when the scroll area is deleted or when a new widget is set. The widget's autoFillBackgroundqthelp://com.trolltech.qt.481/qdoc/qwidget.html#autoFillBackground-prop property will be set to true. If the scroll area is visible when the *widget* is added, you must show()qthelp://com.trolltech.qt.481/qdoc/qwidget.html#show it explicitly. Note that You must add the layout of *widget* before you call this function; if you add it later, the *widget* will not be visible - regardless of when you show()qthelp://com.trolltech.qt.481/qdoc/qwidget.html#show the scroll area. In this case, you can also notshow()qthelp://com.trolltech.qt.481/qdoc/qwidget.html#show the *widget* later. *See also *widgetqthelp://com.trolltech.qt.481/qdoc/qscrollarea.html#widget (). 2013/3/19 Etienne Sandré-Chardonnal etienne.san...@m4x.org Tried, with no success. Surprisingly, if I directly set my QWidget as the QDockWidget content, it works. But if I put a QScrollArea as the QDockWidget content, and my QWidget as QScrollArea content, it does not work. Something is wrong with the QScrollArea Etienne 2013/3/19 preeteesh kakkar preeteesh.kak...@gmail.com Try calling gridlayout-update() and see if that helps? ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] gstreamer is not enabled in Qt5
On terça-feira, 19 de março de 2013 12.03.48, Ramakanthreddy_Kesireddy wrote: I couldnot find gstreamer 0.10.38..So I installed 0.10.36 as gstreamer should be 1.0 but still getting the same error as mentioned below. Any pointers to enable gstreamer in configure verbose output? You've already done that. Your gstreamer is broken. This is not a Qt problem. You need to fix your gstreamer header bugs before it will compile. As you can see here: http://cgit.freedesktop.org/gstreamer/gst-plugins-base/tree/gst-libs/gst/interfaces/propertyprobe.h?id=RELEASE-0.10.36 gst/interfaces/propertyprobe.h in version 0.10.36 does not have an include for global.h. Your headers are either corrupt or have been modified by someone else. Track the change down and fix it. -- 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] QThread and sleep
On terça-feira, 19 de março de 2013 10.37.56, Hugo Drumond Jacob wrote: Hi folks! Today some doubt has ocurred on my office. Suppose that for some reason we need to sleep a thread (not the main thread) for some time Suppose that you're wrong and you came to the wrong solution that sleeping is the way to go. Try to find a solution that makes you do what you need to do and not sleep. (eg. 100 ms). The QThread::wait(int) provides similar functionality to the POSIX pthread_join() and this don't will sleep the target thread, but the caller thread. Call the QThread::wait(int) from the target thread is forbidden (according to line 651 of qthread_unix.cpp). You were looking for QThread::sleep, not wait. The latter is used to wait for a thread to finish, with a given timeout. The former suspends and blocks execution of the calling thread for a given time. Furthermore, is wrong call QThread::wait(int) except for synchronously thread termination with QThread::terminate() ? ( I know, isn't so healthy use QThread::terminate() ) QThread::wait(int) is a busy wait, right? No, it isn't. It's like a pthread_join: it will suspend the execution of the calling thread until the other thread exits or the timeout happens, whichever comes first. QThread::wait() is normal use and is, in fact, used even by the QThread destructor. QThread::sleep() is, more often than not, a bad choice. Avoid it if you can. If you can't, redesign your code so you don't need to use it. The attached code illustrate the question. Your example has the main thread waiting for 100 ms for the auxiliary thread to exit. But your auxiliary thread is busy-looping doing a qDebug and will never exit. Since it doesn't exit, QThread::wait() will always timeout. My immediate solution is: create some MyThread class inherited of QThread just for expose the QThread::*sleep(unsigned long) methods and create some slot or Q_INVOKABLE method on Worker to call these exposed methods. Anyone propose some more elegant solution? Yes: don't sleep. -- 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] QThread and sleep
On terça-feira, 19 de março de 2013 14.56.47, Hugo Drumond Jacob wrote: No problem! In fact, we are using! It's just a question about QThread::wait and QThread::sleep: It's safe use QThread::wait in other situation that not synchronously QThread::terminate ? and you already answered: yes. Maybe not for this point of our application in specific, but is normal usage. They are two very different methods and do not do remotely the same thing. Asking about the two together in the same breath would suggest that you do not understand what they are or what you're trying to do. Anyway, QThread::wait() is perfectly safe to use. It's QThread::terminate() that is not safe. -- 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] scale all fonts
Am 19.03.2013 um 14:19 schrieb Hamish Moffatt ham...@risingsoftware.com: On 19/03/2013 10:55 PM, Rutledge Shawn wrote: On 19 Mar 2013, at 11:27 AM, Hamish Moffatt wrote: Is it possible to apply a scaling to all font sizes used in an application? I can see Qt is doing the right thing by converting point sizes to pixel sizes in accordance with the DPI of the display. Now suppose I want to override the DPI, or redefine point to be other than 1/72 (achieves the same). Is this possible? Unless you are on MacOS, you can override the DPI system-wide. X11 has multiple ways (xorg.conf, and startx -- -dpi 72 or whatever); in Windows you can do it in the display control panel. I'd like to do it in the application, not system-wide. Can I override the DPI that Qt has detected from the OS somehow? Did you try http://qt-project.org/doc/qt-5.0/qtwidgets/qapplication.html#styleSheet-prop and setting the QFont property? Cheers, Oliver___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] QThread and sleep
2013/3/19 Thiago Macieira thiago.macie...@intel.com: On terça-feira, 19 de março de 2013 14.56.47, Hugo Drumond Jacob wrote: No problem! In fact, we are using! It's just a question about QThread::wait and QThread::sleep: It's safe use QThread::wait in other situation that not synchronously QThread::terminate ? and you already answered: yes. Maybe not for this point of our application in specific, but is normal usage. They are two very different methods and do not do remotely the same thing. Asking about the two together in the same breath would suggest that you do not understand what they are or what you're trying to do. Anyway, QThread::wait() is perfectly safe to use. It's QThread::terminate() that is not safe. Yes! I agree: QThread::wait and QThread::terminate are two very different methods and do not do remotely the same thing.. I'm asking about QThread::wait and QThread::sleep, but, Qt documentation suggest Use QThread::wait() after terminate() for synchronous termination.. Some careless reader can understand ONLY use QThread::wait() after QThread::terminate(). As you say, it's safe (but not recommended) use QThread::wait(). Whatever, the doubt was clarified. Thank you very much again! -- 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 mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] Unable to capture audio with QAudioInput
Hi
I was trying to capture audio using QAudioInput. But I get nothing in the
output buffer. Please see the attached code. I try to send it to google for
text recognition after recording but buffer itself is empty.
Platform: Ubuntu Linux 32bit 12.10 with Qt5.0
--
Regards,
pritam
#include QCoreApplication
#include QtMultimedia
#include QFile
#include QtNetwork
#include QUrl
class GRecognizer : public QObject
{
Q_OBJECT
public:
GRecognizer(QObject *parent = 0)
{
// set up the format you want, eg.
m_format.setSampleRate(8000);
m_format.setChannelCount(1);
m_format.setSampleSize(8);
m_format.setCodec(audio/x-flac);
m_format.setByteOrder(QAudioFormat::LittleEndian);
m_format.setSampleType(QAudioFormat::UnSignedInt);
QAudioDeviceInfo info = QAudioDeviceInfo::defaultInputDevice();
if (!info.isFormatSupported(m_format)) {
qWarning()default format not supported try to use nearest;
m_format = info.nearestFormat(m_format);
}
m_input = new QAudioInput(m_format, this);
m_nam = new QNetworkAccessManager(this);
}
void listen(int duration)
{
QTimer::singleShot(duration*1000, Qt::CoarseTimer, this, SLOT(stopRecording()));
connect(m_input, SIGNAL(stateChanged(QAudio::State)), this, SLOT(onStateChanged(QAudio::State)));
m_input-start(m_audio);
}
void recognize(const QBuffer audio)
{
QUrl url(https://www.google.com/speech-api/v1/recognize;);
QUrlQuery postParams;
postParams.addQueryItem(client, chromium);
postParams.addQueryItem(lang, en-US);
url.setQuery(postParams);
QNetworkRequest request(url);
postParams.clear();
postParams.addQueryItem(Content_type, audio/x-flac; rate=8000);
postParams.addQueryItem(content, audio.buffer());
request.setHeader(QNetworkRequest::ContentTypeHeader, audio/x-flac; rate=8000);
QNetworkReply *reply = m_nam-post(request, postParams.toString(QUrl::FullyEncoded).toUtf8());
connect(reply, SIGNAL(finished()), this, SLOT(onFinished()));
connect(reply, SIGNAL(finished()), reply, SLOT(deleteLater()));
}
private slots:
void onFinished() {
QNetworkReply *reply = (QNetworkReply*)sender();
if (reply-error() != QNetworkReply::NoError)
{
qDebug() error in reply reply-errorString();
}
qDebug() reply-readAll();
}
void stopRecording()
{
qDebug() calling stop on recording;
m_input-stop();
}
void onStateChanged(QAudio::State state)
{
switch (state)
{
case QAudio::StoppedState:
if (m_input-error() != QAudio::NoError) {
qDebug() error while recording;
} else {
qDebug() done recording;
QAudioDeviceInfo info(QAudioDeviceInfo::defaultOutputDevice());
if (!info.isFormatSupported(m_format)) {
qWarning()raw audio format not supported by backend, cannot play audio.;
return;
}
QAudioOutput output(m_input-format());
output.start(m_audio);
//qDebug() audio.readAll();
recognize(m_audio);
}
break;
case QAudio::ActiveState:
// Started recording - read from IO device
//qDebug() started recording;
break;
default:
// ... other cases as appropriate
break;
}
}
private:
QNetworkAccessManager *m_nam;
QAudioInput *m_input;
QAudioFormat m_format;
QBuffer m_audio;
};
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
GRecognizer gr;
gr.listen(3);
return a.exec();
}
#include main.moc
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Re: [Interest] QThread and sleep
On terça-feira, 19 de março de 2013 15.15.31, Hugo Drumond Jacob wrote: 2013/3/19 Thiago Macieira thiago.macie...@intel.com: On terça-feira, 19 de março de 2013 14.56.47, Hugo Drumond Jacob wrote: No problem! In fact, we are using! It's just a question about QThread::wait and QThread::sleep: It's safe use QThread::wait in other situation that not synchronously QThread::terminate ? and you already answered: yes. Maybe not for this point of our application in specific, but is normal usage. They are two very different methods and do not do remotely the same thing. Asking about the two together in the same breath would suggest that you do not understand what they are or what you're trying to do. Anyway, QThread::wait() is perfectly safe to use. It's QThread::terminate() that is not safe. Yes! I agree: QThread::wait and QThread::terminate are two very different methods and do not do remotely the same thing.. I'm asking about QThread::wait and QThread::sleep That's what I answered. Sorry if I was not clear. Besides the fact that both have one parameter containing a time in milliseconds, they are very different and do not do remotely the same thing. wait() waits for the started thread to exit up to the timeout amount of milliseconds, but may return sooner (even immediately) if the thread exits sooner (or has exited already). sleep() suspends the execution of the calling thread, whichever that thread is, for the amount of milliseconds and it cannot be interrupted. But, of course, it's not precise: the thread may be resumed at a later time, depending on OS scheduling. , but, Qt documentation suggest Use QThread::wait() after terminate() for synchronous termination.. Some careless reader can understand ONLY use QThread::wait() after QThread::terminate(). As you say, it's safe (but not recommended) use QThread::wait(). Yes, especially if the thread exits by normal means (quit, exit, return from run()). -- 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
