C / C++ / MFC

LRESULT CALLBACK WindProcedure(HWND hWnd, UINT Msg,
                               WPARAM wParam, LPARAM lParam)
{
    float xPos, yPos;
    static int picture;
    picture = ID_BMP_BUSY;

    switch(Msg)
    {
    case WM_CREATE:
    {
        picture = 11;
        break;
    }
    case WM_DESTROY:
    {
        PostQuitMessage(WM_QUIT);
        break;
    }

    case WM_MOUSEMOVE:
    {
        xPos = LOWORD(lParam);
        yPos = HIWORD(lParam);

        if (xPos > 100)
        {
            picture=ID_BMP_IDLE;
            InvalidateRect(hWnd, NULL, TRUE);
        }
        else
        {
            break;
        }
        break;
    }

    case WM_PAINT:
    {
        HDC hDC, button;
        PAINTSTRUCT Ps;
        HBITMAP bmp_button_busy;
        hDC = BeginPaint(hWnd, &Ps);

        bmp_button_busy = LoadBitmap(hInst, MAKEINTRESOURCE(picture));
        printf("recalled\n");
        button = CreateCompatibleDC(hDC);
        SelectObject(button, bmp_button_busy);
        BitBlt(hDC, 100, 50, 180, 70, button, 0, 0, SRCCOPY);

        DeleteDC (hDC);
        DeleteDC (button);
        DeleteObject (bmp_button_busy);
        EndPaint(hWnd, &Ps);
        break;
    }
    default:
        return DefWindowProc(hWnd, Msg, wParam, lParam);
    }
    return 0;
}