QTemporaryFile problems

[marcel]

Don't worry, I deleted it.
Starting detached means that the process won't be a child of your process, therefore you won't be able to monitor its events (like exit). Indeed it starts as a daemon, but that doesn;t mean you can delete the binary.

As for startDetached returning false, maybe you don;'t have the right permissions set on the temp file. See QFile::setPermissions.

[C167]

Thanks
Okay, i'm using this code now:

if ( size != -1 )
	{
		qDebug() << "wrote " << size << " into the file";
		QFile file ( tmpFile->fileName() );
		tmpFile->close();
		if ( file.open( QIODevice::ReadOnly ) && file.exists() )
		{
			qDebug() << file.fileName();
			file.setPermissions ( QFile::ReadOwner | QFile::WriteOwner | 
			QFile::ExeOwner | QFile::ExeUser | QFile::ExeGroup | QFile::ExeOther );
			qDebug() << QProcess::startDetached ( file.fileName() );
		}
	}

if ( size != -1 )
	{
		qDebug() << "wrote " << size << " into the file";
		QFile file ( tmpFile->fileName() );
		tmpFile->close();
		if ( file.open( QIODevice::ReadOnly ) && file.exists() )
		{
			qDebug() << file.fileName();
			file.setPermissions ( QFile::ReadOwner | QFile::WriteOwner | 
			QFile::ExeOwner | QFile::ExeUser | QFile::ExeGroup | QFile::ExeOther );
			qDebug() << QProcess::startDetached ( file.fileName() );
		}
	}

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you see, i've set the permissions to execute for everyone, but it still gives a false
€dit: even if i close the file before launching. strange

[C167]

any ideas? on windows, its the same problem and the program must be finished by tomorrow (need some time to test it etc.)

[marcel]

why don't you manually check the temporary file? put a break point before startDetached and go where the temp file is. try to execute it in a terminal and see what happens.

[C167]

gdb tells me that the file i want to load does not exist, even if i use kdevelop to debug (which is not able to start the program)

[marcel]

probably the file already got deleted.
I meant trying to manually execute the temporary program. just open a console, go to the location where the temp file was created and try to open it.

I suggested the breakpoint before startDetached because that would prevent the file from being deleted.

[C167]

sorry, i meant the file where ther startDetached is, i cannot load the cpp file. I now simply make a QFile::copy to copy it to another filename

Hm... seems that i broke something in the database that contains the blobs, but older, not deleted version work, they start konsole, xterm or wine
€dit: oh wait, the konsole doesn't start, i get no output, but it is a valid binary according to file