Create QMainWindow in runtime

**qt_developer** · 25th June 2012, 18:53

Hi all,

I want to create a QMainWindow when I click in a QPushButton.

I have this code in the SLOT of the QPushButton that is called when the clicked() SIGNAL is emitted:

Qt Code:

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QMainWindow* myQMainWindow = new QMainWindow(this);
myQMainWindow->setWindowModality(Qt::WindowModal);
myQMainWindow->setGeometry(geometry());
myQMainWindow->move(QPoint(100, 100));
 
QVBoxLayout *layout = new QVBoxLayout(myQMainWindow->centralWidget());
myQMainWindow->setLayout(layout);
QPushButton* pushButton = new QPushButton("hello", myQMainWindow->centralWidget());
myQMainWindow->show();

QMainWindow* myQMainWindow = new QMainWindow(this);
myQMainWindow->setWindowModality(Qt::WindowModal);
myQMainWindow->setGeometry(geometry());
myQMainWindow->move(QPoint(100, 100));

QVBoxLayout *layout = new QVBoxLayout(myQMainWindow->centralWidget());
myQMainWindow->setLayout(layout);
QPushButton* pushButton = new QPushButton("hello", myQMainWindow->centralWidget());
myQMainWindow->show();

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The window appears but the button with text "hello" doesn't shown. Why?

Regards.