Call a function from child

MSDQuick

Hello;
I would like to call a function from a child form by pressing a button, so I put these codes in my Main window form:

void MainWindow::Test()
{
    qDebug()<<"Hello World...";
}

And I put these codes in my Child form:

#include "mainwindow.h"

void PicExpand::on_pushButton_clicked()
{
    MainWindow* myMainwindow = qobject_cast<MainWindow*>(parent());
    if (myMainwindow)
    {
        myMainwindow->Test();
    }
}

But, it doesn't work !

Thanks for helping.
MSD.

raven-worx

@MSDQuick said in Call a function from child:

But, it doesn't work !

then probably the widget is not a parent of the MainWindow?!

SGaist

Hi,

To add to @raven-worx, what you are planning to do is bad design more specifically tight coupling. Why should the child know anything about its parent and furthermore call a function of it ?

If you want your MainWindow to react to something happening in the child then you should use signals and slots.