Can't use QMainWindow after opened a QDialog (Qt)

In my program I have the following problem: After I opened a QDialog from QMainWindow , I can't use the QMainWindow , only if I close the QDialog first. Is there a solution for this?

Thank you,

Mate

---

如果你不需要exec的事件循环，你可以使用Dialog-> show（）。

---

You problem is that you create your dialog on the stack. That's why you dialog is deleted after on_action_sszes_Mez_rt_k_triggered() finished. You must create your dialog on the heap:

#include <QMainWindow>
#include <QScopedPointer>
...

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    QScopedPointer<DialogFields> fields_;
};

...

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    field_.reset(new DialogFields());
}

...

void MainWindow::on_action_sszes_Mez_rt_k_triggered() 
{ 
   fields_->adatokFogad((ui->listType->currentRow()+1),
     (ui->listG‌​roup->currentRow()),‌​
     (ui->tableWidgetFiel‌​d->currentRow()+1),
     (‌​ui->actionRemi_mod->‌​isChecked()));
   fields_->show(); 
}

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