QProcess problem (Main program hangs)

**sincnarf** · 8th October 2007, 10:36

Hello. I am trying to call the eog command (it's an image viewing software) from my Qt application. This is the code.

Qt Code:

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void MainWindow::doRawViewer(){
	QMessageBox::information(
					this,
					tr("Required Save"),
					tr("Save the image first in order to view this image under the system's default image viewer"));
	QString fileName = doRawSave();
	if (fileName.isNull())
			return;
	QProcess viewImageProcess(0);
 
#if defined(Q_OS_WIN32)
	viewImageProcess.start(fileName);
#elif defined(Q_OS_LINUX)
	viewImageProcess.execute(QString("eog ") + fileName);	
        //   viewImageProcess.start(QString("eog ") + fileName);	
#endif
}

void MainWindow::doRawViewer(){
	QMessageBox::information(
					this,
					tr("Required Save"),
					tr("Save the image first in order to view this image under the system's default image viewer"));
	QString fileName = doRawSave();
	if (fileName.isNull())
			return;
	QProcess viewImageProcess(0);
		
#if defined(Q_OS_WIN32)
	viewImageProcess.start(fileName);
#elif defined(Q_OS_LINUX)
	viewImageProcess.execute(QString("eog ") + fileName);	
        //   viewImageProcess.start(QString("eog ") + fileName);	
#endif
}

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eog runs properly and it correctly displays the image, the problem is when I close eog, my Qt application hangs. Is this a memory problem or I'm just not using QProcess::execute() and QProcess::start() correctly?

Also, I do not know how to use task manager in ubuntu. can anyone point me to how I can manage the Qt Application when it hangs? It does not force quit at all.