Hi everybody,

As explain in the title, I (think I) have a problem with the QWidget::winId() method return value.

I am using mplayer to play movies in my application. I use the -wid argument to tell mplayer into which widget to display. I can hear sound but I can't see the video.

I did the followings tests :
* I try to run, in the command line, mplayer with the name of a movie file as the only argument ... it works fine because a window opens, and I can see the movie
* I try to do the same in my application, adding the -wid argument with the widget id ... I can hear sounds but can't see anything
* I use a specific background color for my widget in order to be sure it is shown when I request mplayer to play the movie ... I can see a square, with the specific background color where the movie (the widget itself) is supposed to be played so the widget is well shown

So, I don't understand why I can't see the movie.

Here is the code of my widget :
.h
Qt Code: 
  1. #ifndef _WIDGET_VIDEO_H
  2. #define _WIDGET_VIDEO_H
  3.  
  4. #include <qwidget.h>
  5.  
  6. class QString;
  7. class QProcess;
  8.  
  9. class CWidgetVideo : public QWidget
  10. {
  11. public:
  12. 	CWidgetVideo(QWidget* parent=0, const char* name=0);
  13. 	~WidgetVideo();
  14.  
  15. public:
  16. 	void StartVideo(const QString& video);
  17. 	void StopVideo();
  18.  
  19. private:
  20. 	QProcess*	m_pProcessVideo;
  21. };
  22. #endif
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.cpp
Qt Code: 
  1. #include "WidgetVideo.h"
  2. #include <qapplication.h>
  3. #include <qstring.h>
  4. #include <qprocess.h>
  5.  
  6. CWidgetVideo::CWidgetVideo(QWidget* parent/*=0*/, const char* name/*=0*/):
  7. QWidget(parent, name),
  8. m_pProcessVideo(0)
  9. {
  10. }
  11.  
  12. CWidgetVideo::~CWidgetVideo()
  13. {
  14. 	StopVideo();
  15. }
  16.  
  17. void CWidgetVideo::StartVideo(const QString& video)
  18. {
  19. 	setBackgroundColor(QColor(255, 0, 255));
  20.  
  21. 	if( m_pProcessVideo )
  22. 		StopVideo();
  23.  
  24. 	m_pProcessVideo = new QProcess( this );
  25.  
  26. 	m_pProcessVideo->addArgument("C:\\MPLAYER\\mplayer.exe");
  27. 	m_pProcessVideo->addArgument("-wid");
  28. 	m_pProcessVideo->addArgument(QString::number((int)winId()));
  29. 	m_pProcessVideo->addArgument(video);
  30.  
  31. 	if( !m_pProcessVideo->start() )
  32. 		qDebug("Impossible to start");
  33. }
  34.  
  35. void CWidgetVideo::StopVideo()
  36. {
  37. 	if( m_pProcessVideo )
  38. 	{
  39. 		m_pProcessVideo->tryTerminate();
  40.  
  41. 		delete m_pProcessVideo;
  42. 		m_pProcessVideo = 0;
  43. 	}
  44. }
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Finally the main application source code :
Qt Code: 
  1. void TestMPlayerDialog::init()
  2. {
  3. 	m_pPlayer = 0;
  4. }
  5.  
  6.  
  7. void TestMPlayerDialog::starting()
  8. {
  9. 	QString directory = QDir::currentDirPath() + "/";
  10. 	QString video = QFileDialog::getOpenFileName(directory, "Video (*.avi *.wmv *.mpeg *.mov)", this, "", "");
  11.  
  12. 	if( video != "" )
  13. 	{
  14. 		if( m_pPlayer )
  15. 		{
  16. 			delete m_pPlayer;
  17. 			m_pPlayer = 0;
  18. 		}
  19.  
  20. 		m_pPlayer = new CWidgetVideo(this, "Player");
  21.  
  22. 		m_pPlayer->setGeometry(10, 120, 320, 240);
  23. 		m_pPlayer->StartVideo(video);
  24. 		m_pPlayer->show();
  25. 	}
  26. }
  27.  
  28.  
  29. void TestMPlayerDialog::stopping()
  30. {
  31. 	if( m_pPlayer )
  32. 	{
  33. 		m_pPlayer->StopVideo();
  34. 		m_pPlayer->hide();
  35.  
  36. 		delete m_pPlayer;
  37. 		m_pPlayer = 0;
  38. 	}
  39. }
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starting and stopping are two slots called when buttons start and stop are pressed.

I hope someone could help me, thantks in advance.