Listing 8. Response to a WM_LBUTTONDOWN message

void Window1_OnLButtonDown(HWND hwnd, BOOL fDoubleClick, 
  int x, int y, UINT keyFlags)
{
  HRESULT hr;

  CoInitialize(NULL);
  hr = CoCreateInstance(CLSID_ISPEEDDRAW, NULL, CLSCTX_INPROC_SERVER,
                         IID_IUnknown, (VOID**) &P);
  if (SUCCEEDED(hr))
  {
    P->InitParams(hwnd, "E:\\SRC\\BLAISE\\WINFIRE\\BACKGRD1.BMP", 254, "");
    P->Run();
  }
}