Hello, I'm developing application that uses GStreamer to take video from device then do processing with OpenCV and as GUI framework I use QT.

So... This app works on Linux well. But when I try to build it on Windows I got exception in QPainter constructor.

First-chance exception at 0x630373cc (QtOpenGLd4.dll) in guitool.exe: 0xC0000005: Access violation reading location 0xcdcdcdd5.
Unhandled exception at 0x630373cc (QtOpenGLd4.dll) in guitool.exe: 0xC0000005: Access violation reading location 0xcdcdcdd5.

Qt Code: 
  1. QtOpenGLd4.dll!QScopedPointer<QGLFramebufferObjectPrivate,QScopedPointerDeleter<QGLFramebufferObjectPrivate> >::operator->()  Line 112 + 0x3 bytes	C++
  2.  	QtOpenGLd4.dll!QGLFBOGLPaintDevice::context()  Line 376 + 0xe bytes	C++
  3.  	QtOpenGLd4.dll!QGLPaintDevice::beginPaint()  Line 86 + 0xd bytes	C++
  4.  	QtOpenGLd4.dll!QOpenGLPaintEngine::begin(QPaintDevice * pdev)  Line 1259	C++
  5.  	QtGuid4.dll!QPainter::begin(QPaintDevice * pd)  Line 1881 + 0x1d bytes	C++
  6.  	QtGuid4.dll!QPainter::QPainter(QPaintDevice * pd)  Line 1508	C++
  7.  	guitool.exe!WVideo::paintGL()  Line 63 + 0x10 bytes	C++
  8.  	QtOpenGLd4.dll!QGLWidget::glDraw()  Line 4627	C++
  9.  	QtOpenGLd4.dll!QGLWidget::paintEvent(QPaintEvent * __formal)  Line 4425	C++
  10.  	QtGuid4.dll!QWidget::event(QEvent * event)  Line 8518	C++
  11.  	QtOpenGLd4.dll!QGLWidget::event(QEvent * e)  Line 4408	C++
  12.  	QtGuid4.dll!QApplicationPrivate::notify_helper(QObject * receiver, QEvent * e)  Line 4557 + 0x11 bytes	C++
  13.  	QtGuid4.dll!QApplication::notify(QObject * receiver, QEvent * e)  Line 4522 + 0x10 bytes	C++
  14.  	QtCored4.dll!QCoreApplication::notifyInternal(QObject * receiver, QEvent * event)  Line 915 + 0x15 bytes	C++
  15.  	QtCored4.dll!QCoreApplication::sendSpontaneousEvent(QObject * receiver, QEvent * event)  Line 234 + 0x38 bytes	C++
  16.  	QtGuid4.dll!QWidgetPrivate::drawWidget(QPaintDevice * pdev, const QRegion & rgn, const QPoint & offset, int flags, QPainter * sharedPainter, QWidgetBackingStore * backingStore)  Line 5594 + 0xe bytes	C++
  17.  	QtGuid4.dll!QWidgetPrivate::repaint_sys(const QRegion & rgn)  Line 1659	C++
  18.  	QtGuid4.dll!QWidgetPrivate::syncBackingStore()  Line 1890	C++
  19.  	QtGuid4.dll!QWidget::event(QEvent * event)  Line 8665	C++
  20.  	QtOpenGLd4.dll!QGLWidget::event(QEvent * e)  Line 4408	C++
  21.  	QtGuid4.dll!QApplicationPrivate::notify_helper(QObject * receiver, QEvent * e)  Line 4557 + 0x11 bytes	C++
  22.  	QtGuid4.dll!QApplication::notify(QObject * receiver, QEvent * e)  Line 4522 + 0x10 bytes	C++
  23.  	QtCored4.dll!QCoreApplication::notifyInternal(QObject * receiver, QEvent * event)  Line 915 + 0x15 bytes	C++
  24.  	QtCored4.dll!QCoreApplication::sendEvent(QObject * receiver, QEvent * event)  Line 231 + 0x39 bytes	C++
  25.  	QtCored4.dll!QCoreApplicationPrivate::sendPostedEvents(QObject * receiver, int event_type, QThreadData * data)  Line 1539 + 0xd bytes	C++
  26.  	QtCored4.dll!qt_internal_proc(HWND__ * hwnd, unsigned int message, unsigned int wp, long lp)  Line 496 + 0x10 bytes	C++
  27.  	user32.dll!7e368734() 	
  28.  	[Frames below may be incorrect and/or missing, no symbols loaded for user32.dll]	
  29.  	user32.dll!7e368816() 	
  30.  	user32.dll!7e3689cd() 	
  31.  	user32.dll!7e368a10() 	
  32.  	QtCored4.dll!QEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags)  Line 810	C++
  33.  	QtGuid4.dll!QGuiEventDispatcherWin32::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags)  Line 1204 + 0x15 bytes	C++
  34.  	QtCored4.dll!QEventLoop::processEvents(QFlags<enum QEventLoop::ProcessEventsFlag> flags)  Line 150	C++
  35.  	QtCored4.dll!QEventLoop::exec(QFlags<enum QEventLoop::ProcessEventsFlag> flags)  Line 204 + 0x2d bytes	C++
  36.  	QtCored4.dll!QCoreApplication::exec()  Line 1187 + 0x15 bytes	C++
  37.  	QtGuid4.dll!QApplication::exec()  Line 3819	C++
  38.  	guitool.exe!main(int argc, char * * argv)  Line 19 + 0x6 bytes	C++
  39.  	guitool.exe!WinMain(HINSTANCE__ * instance, HINSTANCE__ * prevInstance, char * __formal, int cmdShow)  Line 131 + 0x12 bytes	C++
  40.  	guitool.exe!__tmainCRTStartup()  Line 547 + 0x2c bytes	C
  41.  	guitool.exe!WinMainCRTStartup()  Line 371	C
  42.  	kernel32.dll!7c817077()
To copy to clipboard, switch view to plain text mode 

this is the drawing code with GL initialization:

Qt Code: 
  2. GLuint commands;
  3.  
  4. void WVideo::init(int w, int h)
  5. {
  6.  
  7.   im_width = w;
  8.   im_height = h;
  9.  
  10.   glDeleteLists(commands, 1);
  11.   if (fbo){ 
  12. 	  delete fbo; 
  13.   }
  14.   fbo = new QGLFramebufferObject(w, h);
  15.  
  16.   commands = glGenLists(1);
  17.   glNewList(commands, GL_COMPILE);
  18.   glBegin(GL_QUADS);
  19.   glTexCoord2d(    1,         1);
  20.   glVertex2d(        w-1,     h-1);
  21.   glTexCoord2d(    0,         1);
  22.   glVertex2d(        0,         h-1);
  23.   glTexCoord2d(    0,         0);
  24.   glVertex2d(        0,         0);
  25.   glTexCoord2d(    1,         0);
  26.   glVertex2d(        w-1,     0);
  27.  
  28.   glEnd();
  29.   glEndList();
  30.  
  31.   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  32.   glMatrixMode(GL_PROJECTION);
  33.   glLoadIdentity();
  34.   glViewport(0, 0, w, h);
  35.   glOrtho(0.0, w-1, 0.0, h, -0.01, 0.0);
  36. }
  37.  
  38. void WVideo::paintGL()
  39. {
  40.   mutex.lock();
  41.  
  42.   //if (!fbo) { init(800, 600); }
  43.   if (!fbo) { init(704, 576); }
  44.  
  45.   if (img){
  46.     QPainter fbo_painter(fbo);
  47.     fbo_painter.drawImage(QRect(0, 0, im_width, im_height), *img );
  48.     fbo_painter.end();
  49.   }
  50.  
  51.   glMatrixMode(GL_MODELVIEW);
  52.   glLoadIdentity();
  53.   glEnable(GL_TEXTURE_2D);
  54.  
  55.   glPushMatrix();
  56.   glColor3d(255, 255, 255);
  57.   glCallList(commands);
  58.   glPopMatrix();
  59.   mutex.unlock();
  60. }
To copy to clipboard, switch view to plain text mode