Opening command shell when starting a Qprocess

JCSB

Hi,
I have made a .exe file that I normally run on Windows command line, and I want to run it from my Qt GUI. I think I manage to run it, but I am not sure as there is no window popping up. I would love to have a command line window appearing and all the couts printed on it when I launch my Qprocess.. hopefully this is possible?

Here is how I setup a path to the exe file I want to run, and how I start a qprocess from it afterwards (with a choose path button, and a lauch exe button):

void MainWindow::on_jackExe_path_pushButton_clicked()
{
    _exePath = QFileDialog::getOpenFileName();
    ui->jackExe_path_label->setText(_exePath);

void MainWindow::on_json_launch_pushButton_clicked()
{
    if(_exePath != "")
    {
        for(int i = 0; i < _testQueue.size(); i++)
        {
            QStringList arguments;
            arguments <<  "-json" << _testQueue[0].GetFileName();
            arguments <<  "-port" << ui->comPort_comboBox->currentText();
            arguments << "-help";
            qDebug() << arguments;
            _exeProcess->QProcess::start(_exePath, arguments);
            //I can't see any window! but no error message from Qt
            _testQueue.removeAt(0);
            RefreshJsonListWidget();
        }
    }
    else
    {
        qDebug() << "No Path selected!";
        QMessageBox::critical(this, tr("Error"), tr("No path chosen for Jacky.exe"));
    }
}

How can I open a shell window that runs the Jacky.exe file? Thanks a lot!

SGaist

Hi and welcome to devnet,

Unless your command line application explicitly creates a new command line window, this won't happen.

However, QProcess provides everything your need to read the output generated by your command. For example, QProcess::readyReadStandardOutput that lets you know there's something to read.

Christian Ehrlicher

First you loop does not work at all:

for(int i = 0; i < _testQueue.size(); i++) {
 .. 
_testQueue.removeAt(0);
}

Only half of your elements are taken.

Second you have to wait until the process is finished until starting it again. And no you should not use QProcess::waitForFinished() but signals and slots.

JCSB

@Christian-Ehrlicher Thanks! I have removed the loop for now like so:

void MainWindow::on_json_launch_pushButton_clicked()
{
    if(_exePath != "")
    {
//        for(int i = 0; i < _testQueue.size(); i++)
//        {
            QStringList arguments;
            arguments <<  "-json" << _testQueue[0].GetFileName();
            arguments <<  "-port" << ui->comPort_comboBox->currentText();
            arguments << "-help";
            qDebug() << arguments;
            _exeProcess->QProcess::start(_exePath, arguments);
            _testQueue.removeAt(0);
            RefreshJsonListWidget();
//        }
    }
    else
    {
        qDebug() << "No Path selected!";
        QMessageBox::critical(this, tr("Error"), tr("No path chosen for Jacky.exe"));
    }
}

as I would like to focus on the command line window problem. I tried running it without the loop, just to see if it would appear if I called a single file, but it doesn't

SGaist

Hi and welcome to devnet,

Unless your command line application explicitly creates a new command line window, this won't happen.

However, QProcess provides everything your need to read the output generated by your command. For example, QProcess::readyReadStandardOutput that lets you know there's something to read.

JCSB

@SGaist Thank you, this has solved my issue!! :D