Question

I’am trying to call a DOS command: subst with QProcess :

 QProcess process;
    int returnCode=process.execute(QString("subst " + DLetter+"  "+mountPath));
    qDebug()<<"returnCode"<<returnCode;
    if (returnCode==0){
        qDebug()<<"Mount "<<QString("subst " + DLetter+"  "+mountPath)
                <<"error"<<process.errorString()<<"id"<<process.pid();
        process.waitForFinished();
        ...
    }else
        qDebug()<<" mounting folder failed  "<<process.errorString();

My questions are : Is it enough to call execute() and waitForFinished()? am I safe with calling execute() instead of start ? because I had issues with start() : it didn’t work in all cases(it worked for mounting and didn’t for dismounting folder) .

Any help wil be appreciated.

Answer 1

From the documentation of QProcess::execute() at http://doc.qt.digia.com/qt/qprocess.html#execute

you should do this:

int returnCode=process::execute(QString("subst " + DLetter+"  "+mountPath));
qDebug()<<"returnCode"<<returnCode;
if (returnCode==0){
    qDebug()<<"Mount "<<QString("subst " + DLetter+"  "+mountPath)
            <<"error"<<process.errorString()<<"id"<<process.pid();
}else
    qDebug()<<" mounting folder failed  ";

The key is QProcess::execute is a static member function that starts the program, waits for it to finish then returns the exit code of the process.

Note: I had to remove the non static calls to process.waitForFinished() and process.errorString() since neither can work from a static QProcess::execute.