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qtqprocessdestruction

QProcess on the loose

I have created two programs A and B. B is designed to be as a 32-bits QProcess started within a 64-bits A. These programs communicate nicely via stdin, stdout and QSharedMemory.

A:A() {
 QProcess *p = new QProcess(this);  
 p->start("B.exe");
}
A:~A() {
 p->deleteLater();
}

Now, if A is closed B will also be shut down. However, if I in Windows Task Manager ends the process A, B will keep living on the loose, and the cpu usage of B will be through the roof. Why?

How can I shut down B if A is immediately destroyed?

Solution

  • Try to close() (or kill()) the other process from your DTOR and do a raw delete p afterwards. I had a similar issue when using a QextSerialPort object which, too, tended to stay around as a ghost when deleted with deleteLater(), however promptly packed up and left when immediately deleted.