Show Dialog with Progresbar (Range(0,0)) while Process

[mikrocat]

createDialog();
...
Dialog->show();
startProcess();
...

createDialog();
...
Dialog->show();
startProcess();
...

To copy to clipboard, switch view to plain text mode 

void CreateDialog(){
    Dialog = new QDialog(this);
 
    QVBoxLayout *verticalLayout = new QVBoxLayout;
    QLabel *DialogLabel = new QLabel;
    QPushButton *stopButton = new QPushButton("Stop");
    QProgressBar *DialogBar = new QProgressBar;
 
    DialogBar->setRange(0,0);
    DialogBar->setTextVisible(false);
 
    connect(stopButton,SIGNAL(clicked()),this,SLOT(stop()));
 
    verticalLayout->addWidget(DialogLabel);
    verticalLayout->addWidget(DialogBar);
    verticalLayout->addWidget(stopButton);
 
    Dialog->setWindowTitle(tr("Bitte Warten"));
    DialogLabel->setText(tr("Starten Sie das Gerät neu. \nEs wird nach einem Gerät gesucht..."));
 
    Dialog->setLayout(verticalLayout);
    Dialog->window()->layout()->setSizeConstraint(QLayout::SetFixedSize);
    Dialog->setModal(true);
 
    Dialog->installEventFilter(this);

void CreateDialog(){
    Dialog = new QDialog(this);

    QVBoxLayout *verticalLayout = new QVBoxLayout;
    QLabel *DialogLabel = new QLabel;
    QPushButton *stopButton = new QPushButton("Stop");
    QProgressBar *DialogBar = new QProgressBar;

    DialogBar->setRange(0,0);
    DialogBar->setTextVisible(false);

    connect(stopButton,SIGNAL(clicked()),this,SLOT(stop()));

    verticalLayout->addWidget(DialogLabel);
    verticalLayout->addWidget(DialogBar);
    verticalLayout->addWidget(stopButton);

    Dialog->setWindowTitle(tr("Bitte Warten"));
    DialogLabel->setText(tr("Starten Sie das Gerät neu. \nEs wird nach einem Gerät gesucht..."));

    Dialog->setLayout(verticalLayout);
    Dialog->window()->layout()->setSizeConstraint(QLayout::SetFixedSize);
    Dialog->setModal(true);

    Dialog->installEventFilter(this);

To copy to clipboard, switch view to plain text mode 

I have a Dialog which i show while I search for my Device (sending Data to port, if there is no answer: send again, if there is an answer: close the dialog, a button can interrupt the search).

While this Search I want the user to see the Progressbar so he knows that something is happening. It was working but then i changed the code and too late I realised that it isn't working anymore.

The progressbar is empty and does nothing, only when I click on the dialog and move it I can wake it up but then of course the process does not go on.
I would call QApplication:rocessEvents() to wake up the progressbar but I am not setting the value of the progressbar or anything like that, so i do not know where I should call it.