[SOLVED] Start QProcess out of QML Issue

Eddi0406

Hi Guys,

I would like to start an application out of Qt Quick and check if it was started successfully or if it was closed by the user. So I wrote a small plugin to access Qt's QProcess functionality out of Qt Quick. It works for starting some applications, but when I check whether the application is running, it always says true (also when not running). What's wrong here?

@
C++ code:
void Launcher::launch(const QString &program, const QStringList &arguments)
{
m_process->startDetached(testString, arguments);
}

bool Launcher::isRunning()
{
return m_process->Running? true : false;
}

QML code:
Launcher {
id: exampleLauncher
}

...
exampleLauncher.launch(programName, arguments)
exampleLauncher.isRunning()
@

Thank you for your help.

p3c0

Hi,

You should use state() to check the current state and not the enum value.
@
return m_process->state()==QProcess::Running ? true : false;
@

Edit: Removed Extra =

Eddi0406

My program crashes if I read out the m_process->state(). I don't understand this... Do you have any idea for that problem?

p3c0

Probably because the object is not initialized. Put a condition to check if it is null before the return statement.

Eddi0406

Works perfectly, thank you!:)

Another error was to use startDetached() instead of start().

p3c0

Glad that it worked :)
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