use button from another Window

[raphaelf]

Hello everybody!

QT: 4.1.1

I have 2 Windows: Mainwindow and Login.
I would like to enable a button in the Mainwindow if the login was ok.
My sitiation:
1. start program (MainWindow)
2. open Login (Modal)
3. click on OK, if connection was ok, i need to enable a button in the MainWindow..

I tryied this:

login.cpp

MainWindow* m;
m->ui.speichern_btn->setEnabled(TRUE);

MainWindow* m;
m->ui.speichern_btn->setEnabled(TRUE);

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login.h

public:
        LoginDialog(QWidget *parent = 0);
        MainWindow* m;

public:
        LoginDialog(QWidget *parent = 0);
        MainWindow* m;

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Have somebody a idea