Thread: Need help creating window class

I want to create a class like this:

Code:

class MyWindow
{
    public:
       void CreateWindow(...);
       void WndProc(...);
       
       bool MainLoop();
       
       ................
};

The class will be used as shown below:

Code:

int main()
{
    MyWindow *win = new MyWindow;

    win->CreateWindow();

    while(win->MainLoop())
        ;

Unfortunately, C++ won't let me define as message callback the WndProc() function of each class.

So, what to do next?

you cannot define a callback in a 'MyWindow' class and use it with a windows system because the callback is a function of type 'MyWindow::WndProc' and windows has no way of knowing what the 'MyWindow' class is. non-static member functions use a calling convention that implicitly passes the objects pointer to the function. This allows you to use the 'this' pointer. a work around is to have one window procedure that can dispatch the messages to the appropriate class window procedure.