Qt5/C++ - QProcess, capture terminal data

[jimbo]

Qt5.5.1
QtCreator 3.5.1
Windows 7

Hello,

I'm runnning a QProcess, and it runs fine. (7z, command line version of 7Zip)
The command I'm running outputs to the command prompt console continuously changing the % value
of the un-zipping progress. Run from the command prompt, shows:-

15% - myFile.zip

15% - myFile.zip

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What I can't work out is how to redirect the console to my program, so I can show a progress bar.
I underatand the QPogressBar procedures.
Thanks for any advice offered.

Regards

process->setProcessChannelMode(QProcess::ForwardedChannels);
process->start(cmd);
do {
    delay(1000); //processes events
    qDebug() << "o - " << (process->readAllStandardOutput());
    qDebug() << "e - " << (process->readAllStandardError());
} while(busy); //flag, changes when QProcess finishes, signal connected to slot
process->waitForFinished(-1); // -1, forever
process->close();

process->setProcessChannelMode(QProcess::ForwardedChannels);
process->start(cmd);
do {
    delay(1000); //processes events
    qDebug() << "o - " << (process->readAllStandardOutput());
    qDebug() << "e - " << (process->readAllStandardError());
} while(busy); //flag, changes when QProcess finishes, signal connected to slot
process->waitForFinished(-1); // -1, forever
process->close();

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Output:-

o -  ""
e -  ""
o -  ""
e -  ""
...
...

o -  ""
e -  ""
o -  ""
e -  ""
...
...

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[anda_skoa]

Sometimes shell programs don't actually write to the output streams but to the terminal directly.

In such cases they often have command line options to specifically enable writing to the streams.

Cheers,
_

[jimbo]

Hello anda_skoa,

Thanks for your reply.
I've added some options to the called program and reduced my QProcess to this:-

process->setProcessChannelMode(QProcess::ForwardedChannels);
process->start(cmd);
do {
    delay(500); //process events
} while(busy);
process->waitForFinished(-1);
process->close();

process->setProcessChannelMode(QProcess::ForwardedChannels);
process->start(cmd);
do {
    delay(500); //process events
} while(busy);
process->waitForFinished(-1);
process->close();

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Application output tab, when the program is run inside QtCreator:-

0%
 
 
  0% - myData.img
 
 
  1% - myData.img
 
 
  2% - myData.img
  ...
  ...

0%

    
  0% - myData.img

                                     
  1% - myData.img

                                     
  2% - myData.img
  ...
  ...

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Of course, If I take out the first program line there is no output.
Is there any way I can capture the output from 'process->setProcessChannelMode(QProcess::ForwardedChannels )'.

Regards

[anda_skoa]

If you don't forward the channels but connect slots to the two readyRead signals, do these slots get invoked?

Cheers,
_

[jimbo]

Hello anda_skoa.

Thanks for your reply and help.
'readyReadStandardOutput'. No help.
'readyReadStandardError'. Does help.
I can get the '%' from this.

Regards

process = new QProcess(this);
QObject::connect(process, SIGNAL(started()), this, SLOT(processStarted()));
QObject::connect(process, SIGNAL(readyReadStandardOutput()),this,SLOT(readyReadStandardOutput()));
QObject::connect(process, SIGNAL(readyReadStandardError()),this,SLOT(readyReadStandardError()));
QObject::connect(process, SIGNAL(finished(int)), this, SLOT(processFinished()));

process = new QProcess(this);
QObject::connect(process, SIGNAL(started()), this, SLOT(processStarted()));
QObject::connect(process, SIGNAL(readyReadStandardOutput()),this,SLOT(readyReadStandardOutput()));
QObject::connect(process, SIGNAL(readyReadStandardError()),this,SLOT(readyReadStandardError()));
QObject::connect(process, SIGNAL(finished(int)), this, SLOT(processFinished()));

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void MainWindow::readyReadStandardError() //slot
{
    QString errorString;
    errorString.append(process->readAllStandardError());
    qDebug() << "readyReadStandardError - " << errorString;
}

void MainWindow::readyReadStandardError() //slot
{
    QString errorString;
    errorString.append(process->readAllStandardError());
    qDebug() << "readyReadStandardError - " << errorString;
}

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SLOT 'readyReadStandardError' gives:-

readyReadStandardError -  "  0%"
readyReadStandardError -  "\r    \r  0% - myData.img"
readyReadStandardError -  "\r                                     \r  1% - myData.img"
readyReadStandardError -  "\r                                     \r  2% - myData.img"
readyReadStandardError -  "\r                                     \r  3% - myData.img"
...
...

readyReadStandardError -  "  0%"
readyReadStandardError -  "\r    \r  0% - myData.img"
readyReadStandardError -  "\r                                     \r  1% - myData.img"
readyReadStandardError -  "\r                                     \r  2% - myData.img"
readyReadStandardError -  "\r                                     \r  3% - myData.img"
...
...

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