将qstring设置为qprocess正确

Question

I am trying to set a QString to Qprocess to execute it in Qt. My problem is that I can't get it working although it seems fine from the QProcess Documentation . I wanted to do this in a pushbutton press, so my code looked at first like the following (thumbs up, the process is a ROS Command):

void Viatic_Interface::gazebo_launch_world()
{
    QString program = "roslaunch";
    QStringList arguments;
    arguments << " wifibot_gazebo " << ui->txt_world->text();

    QProcess *myProcess = new QProcess();
    QProcessEnvironment env = QProcessEnvironment::systemEnvironment();
    myProcess->setProcessEnvironment(env);
    myProcess->start(program, arguments);
    myProcess->waitForStarted(-1);
}

and that didn't work. It looks like sth is going in getting the QString from the LineEdit. Just to check if my command works, I tried to set the command as a one line command and it worked :

void Viatic_Interface::gazebo_launch_world()
{
    QString program = "roslaunch wifibot_gazebo wifibot_gazebo.launch";

    QProcess *myProcess = new QProcess();
    QProcessEnvironment env = QProcessEnvironment::systemEnvironment();
    myProcess->setProcessEnvironment(env);
    myProcess->start(program);
    myProcess->waitForStarted(-1);
}

Am I missing something ??

Answer 1

---

This was solved by removing the spaces and adding a QString cast, like this :

void Viatic_Interface::gazebo_launch_world()
{
    QString program = "roslaunch";
    QStringList arguments;
    arguments << "wifibot_gazebo" << (QString)ui->txt_world->text();

    QProcess *myProcess = new QProcess();
    QProcessEnvironment env = QProcessEnvironment::systemEnvironment();
    myProcess->setProcessEnvironment(env);
    myProcess->start(program, arguments);
    myProcess->waitForStarted(-1);
}

found no explanation why...

Thanks for the help anyway !

Cheers,