QProcess wo event loop

[brazso]

I wish to start an external process inside my gui application (QT v4.4.2, Win), the application can be suspended until the termination of that process. So far I used successfully the following code snippet:

QProcess process;
process.start("something", args);
 
if (!process.waitForStarted()){
	// some error msg dialog
    	return;
}
 
if (!process.waitForFinished(-1))
	return;

QProcess process;
process.start("something", args);

if (!process.waitForStarted()){
	// some error msg dialog
    	return;
}

if (!process.waitForFinished(-1))
	return;

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Then I could read the the complete output/error channel of the terminated process. However I wish I could process the output channels line by line during the operation of the process, because I want to feed a progress bar. Therefore I replaced the waitForFinished block to something like that:

while (process.state()==QProcess::Running /* || process.waitForReadyRead(1) */){
// reading process output channels
}

while (process.state()==QProcess::Running /* || process.waitForReadyRead(1) */){
// reading process output channels
}

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My problem is that this while loop never ends, the process state always remains in Running state. How can I achieve my aim without asynchronous usage?

[boudie]

Have you tried a connection to this signal:
QProcess::readyReadStandardOutput ()

[brazso]

Thanks for your reply but I wish to avoid the asynchronous process calling due to the nature of my task. Finally I think I have found the solution, process.waitForReadyRead must be used:

process.start("something", args);
 
if (!process.waitForStarted()){
	// some error message
	return;
}
 
while (process.waitForReadyRead(-1)){
	QByteArray newData = process.readAllStandardOutput();
	result = QString::fromLocal8Bit(newData);
	qDebug(qPrintable(QString("waitForReadyRead:")+result));
}
 
// here the process is already finished

process.start("something", args);

if (!process.waitForStarted()){
	// some error message
	return;
}

while (process.waitForReadyRead(-1)){
	QByteArray newData = process.readAllStandardOutput();
	result = QString::fromLocal8Bit(newData);
	qDebug(qPrintable(QString("waitForReadyRead:")+result));
}

// here the process is already finished

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And I do not need the process.waitForFinished method at all.