How to delete a QProcess instance correctly?
- by Kopfschmerzen
Hi everyone!
I have a class looking like this:
class FakeRunner : public QObject
{
Q_OBJECT
private:
QProcess* proc;
public:
FakeRunner();
int run()
{
if (proc)
return -1;
proc = new QProcess();
QStringList args;
QString programName = "fake.exe";
connect(comp, SIGNAL(started()), this, SLOT(procStarted()));
connect(comp, SIGNAL(error(QProcess::ProcessError)), this,
SLOT(procError(QProcess::ProcessError)));
connect(comp, SIGNAL(finished(int, QProcess::ExitStatus)), this,
SLOT(procFinished(int, QProcess::ExitStatus)));
proc->start(programName, args);
return 0;
};
private slots:
void procStarted() {};
void procFinished(int, QProcess::ExitStatus) {};
void procError(QProcess::ProcessError);
}
Since "fake.exe" does not exist on my system, proc emits the error() signal. If I handle it like following, my program crashes:
void FakeRunner::procError(QProcess::ProcessError rc)
{
delete proc;
proc = 0;
}
It works well, though, if I don't delete the pointer. So, the question is how (and when) should I delete the pointer to QProcess? I believe I have to delete it to avoid a memory leak. FakeRunner::run() can be invoked many times, so the leak, if there is one, will grow.
Thanks!
