The problem you have if you make it static is that you only have one window procedure for many window instantiations. However, you must give a global or static method to the WNDCLASS argument. So what you do is make a static window procedure that acts as a message router. This static procedure maps the message to the appropriate C++ window object.

static int WndProcRouter(HWND hwnd, ...etc)

Now the problem is that in the static wndproc you don''t have the C++ object that the message was directed to. BUT we do have the HWND. We need a method that given the HWND as an argument returns us the corresponding C++ window object. We want something like:

Window* win = GetWindowObject(hwnd);

Then we can write:

win->msgProc(...);

There are several ways to associate a c++ window object with a HWND. We can keep a static data structure that stores the HWND and a ptr to its corresponding C++ object. Then procide an interface that searches the data structure for a particular HWND and returns the Window object.

During creation:

dataStructure.AddWindow(_hwnd, this);

then:

Window* GetWindowObject(HWND hwnd)
{
Window* win = dataStructure.get(hwnd);

win->msgProc(...);
}





ECKILLER