SendMessage(hwnd, WM_SETICON, ICON_BIG,  (LPARAM)       LoadIcon((HINSTANCE) GetWindowLongPtr(hwnd, GWLP_HINSTANCE),       MAKEINTRESOURCE(IDI_ICON1)));      SendMessage(hwnd, WM_SETICON, ICON_SMALL, (LPARAM)       LoadIcon((HINSTANCE) GetWindowLongPtr(hwnd, GWLP_HINSTANCE),       MAKEINTRESOURCE(IDI_ICON1)));