My application crashes

[spirit]

But I've got another question, following is your code to start another application:

QProcess::startDetached(filename);

QProcess::startDetached(filename);

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in this case a process will start as

Unix: The started process will run in its own session and act like a daemon.

Windows: Arguments that contain spaces are wrapped in quotes. The started process will run as a regular standalone process.

in this case

Are there some different effects between your way and mine? The following is my way to start it:

QStringList arguments;
    arguments << "-style" << "motif";
    QProcess *myProcess = new QProcess(this);
    myProcess->start(path, arguments);

QStringList arguments;
    arguments << "-style" << "motif";
    QProcess *myProcess = new QProcess(this);
    myProcess->start(path, arguments);

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Thanks a lot!!

you don't lose communication with a process, i.e. you can handle signals readyReadStandardError, readyReadStandardOutput etc.
so, if you don't need to process signals then you can use only static methods for starting processes.