if( QP->waitForFinished(100)) ???

[Anonymous_Banned275]

I expect the if( QP->waitForFinished(100))
to process the code AFTER it is done stalling. 100 mS in this case
it instead goes to
else

Am I using it wrong ?

        do
        {
            text = "Process loop ";
            qDebug() <<text;
            result = QP->readAllStandardOutput();
            qDebug() << result;
            if(  QP->waitForFinished(100))
            {
                // done waiting
                if(QP->waitForReadyRead())                      // QP->waitForFinished(5000) | QP->waitForReadyRead())
                {
                    text = "QProcess waitForReadyRead()";
                    qDebug() << text;
                    result = QP->readAllStandardOutput();
                }
            }
            else
            {
                // should never get here
                text = " PROCESS NOT FINISHED ?? QP->waitForFinished(100)";
                qDebug() << text;
            }
        }
        while(
             time->elapsed() <500);


       text = "Elapsed time ";
       text += QString::number(time->elapsed());
       qDebug() << text;
```* "verify list  Discovery started"
* "verify list  SPP_CA"
* DEBUG TRACE start new QProcess();
* "DEBUG TRACE start new QProcess();"
* "QProcess running.."
* "Process loop "
* ""
* " PROCESS NOT FINISHED ?? QP->waitForFinished(100)"
* "Process loop "
* ""
* " PROCESS NOT FINISHED ?? QP->waitForFinished(100)"
* "Process loop "
* "Waiting to connect to bluetoothd...\r\u001B[0;94m[bluetooth]\u001B[0m#                                                                              \r\r\u001B[0;94m[bluetooth]\u001B[0m# \r                        \rAgent registered\n\u001B[0;94m[bluetooth]\u001B[0m# \r                        \r[\u0001\u001B[0;93m\u0002CHG\u0001\u001B[0m\u0002] Controller 00:50:B6:80:4D:5D Pairable: yes\n\u001B[0;94m[bluetooth]\u001B[0m# \r                        \r[\u0001\u001B[0;93m\u0002CHG\u0001\u001B[0m\u0002] Controller 00:15:83:15:A2:CB Pairable: yes\n\u001B[0;94m[bluetooth]\u001B[0m# "
* " PROCESS NOT FINISHED ?? QP->waitForFinished(100)"
* "Process loop "
* ""
* " PROCESS NOT FINISHED ?? QP->waitForFinished(100)"
* "Process loop "
* ""
* " PROCESS NOT FINISHED ?? QP->waitForFinished(100)"
* "Elapsed time 512"
* "verify list  Discovery started"
* "verify list  SPP_CA"
* "DONE Process command...QString BT_Utility_Library::ProcessCommand(char *, QStringList)"
* 07:50:17: /mnt/RAID_124/PROJECTS_MAR3_CONFIG/mdi/MDI crashed.

[Christian Ehrlicher]

@AnneRanch said in if( QP->waitForFinished(100)) ???:

I expect the if( QP->waitForFinished(100))
to process the code AFTER it is done stalling. 100 mS in this case

The documentation is very clear about it:

Blocks until the process has finished and the finished() signal has been emitted, or until msecs milliseconds have passed.

[Anonymous_Banned275]

@Christian-Ehrlicher Unfortunately one has to read more than one sentence.

On top of that I have made few logical errors.
Just in case it may be of real interest to some - here is the revised BASIC code .

There are few issues running "bluetoothctl" command.
It responds with its own "wait" - hence it gives false waitForReadyRead.
But additional fake 100 mS delay seems to be OK .
Then readAllStandardOutput() can be used only ONCE after real
waiting for output is done....

    {
            text = "Process single shot  ";
            qDebug() <<text;
            if (QP->waitForReadyRead(500))
            {
                // READY TO READ
                // make sure it is all
                QP->waitForFinished(100); fake delay 
                result = QP->readAllStandardOutput();
                qDebug() << result;
                if(result.isEmpty())
                {
                    text = "failed to get any data output ";
                    qDebug() << text;
                }
               else
                      analyze  output here 
            }
            else
            {
                text =   "waitForReadyRead(500) timed out ";
                qDebug() << text;
            }

            text = "Elapsed time ";
            text += QString::number(time->elapsed());
            qDebug() << text;
            QP->close();
        }
    }