QProcess in a loop, works but....

[Santosh Reddy]

Then avoid the for loop and start the next process in the slot "onProcessEnded()"

[Joelito]

How should I avoid the for loop if I want to convert files in "dir_list" from the method "cb_process_dir"?

[myta212]

Hi,
You can use void QProcess::finished ( int exitCode, QProcess::ExitStatus exitStatus ) [signal] to running QProcess in a loop. This signal will executed after the current QProcess active finished. This is my simple QProcess::finished function contents :

//this function will executed at the end of every process
void Qt_Loop_QProcess::finishedProcess ( int exitCode, QProcess::ExitStatus exitStatus )
{
	ui.textReport->append("complete"); //finishid process command
 
    if(idxProcess<nExtension) //run qprocess again until all extension finished
    {
    	ui.listCommand->setCurrentRow(idxProcess);
 
    	/* create QProcess object */
    	proc= new QProcess();
    	QString strCommand = setCommand(listExtension.at(idxProcess));
    	proc->start("/bin/bash", QStringList() << "-c" << strCommand);
 
    	/* show output */
    	connect(proc, SIGNAL(readyReadStandardOutput()),this, SLOT(rightMessage()) );
    	connect(proc, SIGNAL(readyReadStandardError()), this, SLOT(wrongMessage()) );
    	connect(proc, SIGNAL(finished(int, QProcess::ExitStatus)),
    			this, SLOT(finishedProcess(int, QProcess::ExitStatus)) );
 
    	idxProcess++;
    }
}

//this function will executed at the end of every process
void Qt_Loop_QProcess::finishedProcess ( int exitCode, QProcess::ExitStatus exitStatus )
{
	ui.textReport->append("complete"); //finishid process command

    if(idxProcess<nExtension) //run qprocess again until all extension finished
    {
    	ui.listCommand->setCurrentRow(idxProcess);

    	/* create QProcess object */
    	proc= new QProcess();
    	QString strCommand = setCommand(listExtension.at(idxProcess));
    	proc->start("/bin/bash", QStringList() << "-c" << strCommand);

    	/* show output */
    	connect(proc, SIGNAL(readyReadStandardOutput()),this, SLOT(rightMessage()) );
    	connect(proc, SIGNAL(readyReadStandardError()), this, SLOT(wrongMessage()) );
    	connect(proc, SIGNAL(finished(int, QProcess::ExitStatus)),
    			this, SLOT(finishedProcess(int, QProcess::ExitStatus)) );

    	idxProcess++;
    }
}

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I get this tutorial at here http://toto-share.com/2011/11/qt-qprocess-in-a-loop. So, if you interest, you can download the complete source code at that location

Best regards,

Myta