Multiple Window Class Variables

[2lights]

Qt colleagues

I have multiple windows(ControlWindow, NewWindow)

How do I pass variables between windows (From ControlWindow to NewWindow & NewWindow to ControlWindow)

ControlWindow CreateNewWindow button creates a newWindow.
ControlWindow also has an upload image Button that loads an image in the label of the new window.
ControlWindow holds the name of image(QString) & the QImage

In my newWindow Constructor

MainWindow TempMain; //probably because im creating a new instance of mainWindow variables are blank!
                                 //But that than how do I call the getter Functions of mainWindow from newWindow?
                                 //Nothing loads, the QString & Qimage is blank?
    QString tempName = TempMain.getName();
    QImage tempImage = TempMain.getImage();
 
    tempImage .load(tempName);
    ui->labelImage->setPixmap(QPixmap::fromImage(tempImage));

MainWindow TempMain; //probably because im creating a new instance of mainWindow variables are blank!
                                 //But that than how do I call the getter Functions of mainWindow from newWindow?
                                 //Nothing loads, the QString & Qimage is blank?
    QString tempName = TempMain.getName();
    QImage tempImage = TempMain.getImage();

    tempImage .load(tempName);
    ui->labelImage->setPixmap(QPixmap::fromImage(tempImage));

To copy to clipboard, switch view to plain text mode 

Help please. Ideas

Signals and slots, Maybe?

[anda_skoa]

You can of course always use signal/slot.

Also, if MainWindow holds a pointer to your new window, than it can access all its public methods, so it can call setters and getters.

Cheers,
_