QProcess pipes problem

[benacler]

Hi folks,

I'm relatively new to QT and I'm going nut with a weird problem. I'm using Qt 4.3.1. what i want to do is spawning a process and collect it's output to a child window, that's the code I'm executing:

QProcess* proc = new QProcess(this);
proc->setProcessChannelMode(QProcess::MergedChannels) ;
connect(proc,SIGNAL(finished(int,QProcess::ExitSta tus)), this, SLOT(procFinished(int,QProcess::ExitStatus)));
connect(proc,SIGNAL(readyRead()), this, SLOT(pipeData()));
proc->start(app,QStringList() << "-v" << "3");

the pipeData slot just read using readAllStandardOutput() and concatenate it in the view.

the problem is that I receive only ONE signal with approx 4K of data, after that one, I don't get any activity further. The process I spawned has its own logging system , so I can verify that's effectively running and that's effectively dumping more data, but nothing comes from the pipes...

any suggestion ?

Thanks

[wysota]

How about using readAll() instead of readAllStandardOutput()? Maybe that's a problem after using MergedChannels...

[benacler]

there's no difference....still get only 4K of data then it stops.

[wysota]

Could we see your pipeData() slot?

[benacler]

void ServiceControl::pipeData() {
 
if (proc) {
    QByteArray data = proc->readAll(); // ReadAll as you suggested 
    if (serviceMonitor) serviceMonitor->addBytes(data);
}
 
}

void ServiceControl::pipeData() {

if (proc) {
    QByteArray data = proc->readAll(); // ReadAll as you suggested 
    if (serviceMonitor) serviceMonitor->addBytes(data);
}

}

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[wysota]

A potential problem is that you create the process and assign it to a local variable "proc" that is in your previous snippet of code istead of the "proc" member variable of the class and contents of if don't get executed.

[benacler]

I apologize, the output from my process isn't flushed, problem solved