Question

I have the following source code:

void Processmethod()
{
    QDialog *ProcessMessage = new QDialog;      
    Ui::DialogProcessMessage *Dialog = new Ui::DialogProcessMessage();              
    Dialog->setupUi(ProcessMessage);              //polymorphy
    ProcessMessage->setModal(true);
    ProcessMessage->setAttribute(Qt::WA_DeleteOnClose);
    connect(Dialog->pushButtonAbort, SIGNAL(clicked()), &Prozess, SLOT(kill()));  
    connect(&Prozess6, SIGNAL(finished(int, QProcess::ExitStatus)),  this, SLOT(helper()));
    connect(&Prozess6, SIGNAL(error(QProcess::ProcessError)),  this, SLOT(helper()));
 connect(this,SIGNAL(enablePushButton(bool)),Dialog->pushButtonClose, SLOT(setEnabled(bool)));
    Prozessmeldung->setModal(true);
    ProcessMessage->show();

    processmethodONE();
}

How can I delete the heap-object Dialog best when the heap-object ProcessMessage is deleted (which is deleted when closed)? Both objects must be created on the heap. Furthermore the class “Ui::DialogProcessMessage” is directly created by the ui-file and therefore any changes in it will be deleted everytime the ui-file is changed.

Answer 1

All instances of QObject emit a destroyed(QObject*) signal when they are deleted. Connect ProcessMessage‘s signal to some other persistent object’s slot, and delete your Dialog heap-object from there.

Ref.: Qt documentation for QObject