change cursor icon while program is busy

[Tomasz]

Ok. Maybe this will be stupid question, but I need to ask - when child process is exiting what is happening with the pointer and all reserved memory for that process? You said that I'm probably deleting same object twice, so I removed one line to see what will happen:

connect(proc, SIGNAL(finished(int)),this, SLOT(deleteLater()));

connect(proc, SIGNAL(finished(int)),this, SLOT(deleteLater()));

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And now it seems everything looks fine but I don't know if I'm doing some mess in memory. So I need to know Is everything being delete when I'm closing child application.

thanks in advance
best regards
Tomasz

[wysota]

Ok. Maybe this will be stupid question, but I need to ask - when child process is exiting what is happening with the pointer and all reserved memory for that process?

You mean the QProcess object? Nothing is happening to it. It's not deleted automatically if that's what you're asking.

[Tomasz]

So I have no idea why my app is crashing if I try to delete my QProcess object:

connect(proc, SIGNAL(finished(int)), this, SLOT(appIsLoaded()));
connect(proc, SIGNAL(finished(int)), this, SLOT(deleteLater()));  //without it works fine, no errors
proc->start("/myapp", QStringList() << parameter);

connect(proc, SIGNAL(finished(int)), this, SLOT(appIsLoaded()));
connect(proc, SIGNAL(finished(int)), this, SLOT(deleteLater()));  //without it works fine, no errors
proc->start("/myapp", QStringList() << parameter);

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It happens when I run process by start() If I use startDetached() I can delete QProcess object without any error... I've checked if I'm deleting something twice, and I'm not. QProcess object is the only thing I'm deleting.

thanks in advance
best regards
Tomasz

[wysota]

Maybe you are doing it in appIsLoaded()? Anyway, you can reuse the object again if you need to spawn the process again so you don't have to create and delete it every time.

[Tomasz]

appIsLoaded() only restores cursor nothing more. But I's good idea to reuse that pointer. I'll declare it in header file and use every time I need. Should I clean It or something after every use?

But I'm still curious about why it crashes...

thanks in advance
best regards
Tomasz

[wysota]

No, you don't have to do anything with it.