callbacks within a class?

heeuo, I'm just wondering if something like this is possible:

Code:

---


class myClass{
void RegisterWindow();
RESULT CALLBACK myProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
...
}

...
...

void myClass::RegisterWindow()
{
WNDCLASSEX wnd;
wnd.cbClsExtra=NULL
...//some more initialization
wnd.lpfnWndProc = myProc;
...
}

---

offcourse the above generates errors but is there a way to use a class member as callback function??

/thankkkks :)
/btq
/
/

[edit]Nice try with the code tags, read this for next time. Hammer.

a callback must be a _stdcall which means that it must not be a member function unless..... It's global or static. I'll give an example of how in just a sec

Code:

---

class Window
    {
    public:
          void CreateWnd(HWND parentwnd);
          .
          .
          .
    private:
          static int APIENTRY WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
          HWND
              m_hwnd;
    };


void Window::CreateWnd(HWND parentwnd)
    {
    m_hwnd = ::CreateWindow("ClassName","title stuff",
                        WS_BLAHBLAH, x, y, w, h,
                        parentwnd, (HMENU)NULL, hInst, (LPARAM)this);
   
    }

int APIENTRY Window::WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
    {
    Window *This = (Window*)GetWindowLong(hWnd,GWL_USERDATA);
    if(message == WM_CREATE)
          {
          CREATESTRUCT *cs = lParam;
          This = (Window*)cs->lpCreateParams;
          SetWindowLong(hWnd,GWL_USERDATA, cs->lpCreateParams);
          }
    if(This)
        return This->CallBack(message, wParam, lParam);
    else
          return DefWindowProc(hWnd, message, wParam, lParam)
    }

---

probably errors in this code, I just typed it in the browser and didn't actually attempt a compile but this is the idea

thanks man :)
/btq

You can also defeat the WindProc by declaring it like:

friend LRESULT CALLBACK WindowProcedure(/.../)

And FillYourBrain: it is just as easy setting the GWL_USERDATA right after calling CreateWindowEx(). But then again, what's the diff, right?

Sebastiani, you're right. In fact I used to do that. The only difference is I liked getting the hWnd into the class during WM_CREATE (an assignment that I left out in the rushed example).