Read from QProcess:write()

[VintoreZZ]

I have an application which runs another applications and sends data into them. Child apps then read that data. Im creating instances of QProcess for each application i want to write to:

QProcess* process = new QProcess(this);
process->setProcessChannelMode(QProcess::ForwardedChannels);
process->start(...);

Running executables works fine. Now im trying to write info into them, and then read that info inside those executables(executables are another qt projects).

I am writing info to stdin:

process->write(...); //writes into process stdin according to docs

Ok, to read written data inside those processes i use QSocketNotifier:

QSocketNotifier* notifier = new QSocketNotifier(fileno(stdin), QSocketNotifier::Read, this);
connect(notifier, &QSocketNotifier::activated, this, [this](){
    QMessageBox msgBox;
    msgBox.setText("I have a data to read!!!");
    msgBox.exec();
});
notifier->setEnabled(true);

Unfortunately, QSocketNotifier::activated() never fires...

[VintoreZZ]

Ok, that is interesting. I wrote this topic using Windows. I ran exactly the same project using linux, and it worked just fine...
I will mark the topic "kinda solved", because i actually develop the thing for linux...
But it seems that windows users will have some trouble finding a workaround.

[Christian Ehrlicher]

See https://bugreports.qt.io/browse/QTBUG-15457 - don't know why it's marked as 'out of scope' though...

[JonB]

@Christian-Ehrlicher
Who knows? But the fact that it was raised in year 2010, under Nokia/TrollTech, is interesting ;-)