求高手!
WINAPI __glutWindowProc( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam )函数里有句这个:
case WM_KEYDOWN: return HANDLE_WM_KEYDOWN ( hwnd, wparam, lparam, __glutOnKey);
然后其它头文件里有句:
#define HANDLE_WM_KEYDOWN(hwnd, wParam, lParam, fn) \
((fn)((hwnd), (UINT)(wParam), TRUE, (int)(short)LOWORD(lParam), (UINT)HIWORD(lParam)), 0L)
这怎么理解,其中我感觉__glutOnKey 就是WM_KEYDOWN消息的处理函数。这个宏定义怎么解释啊?
哪位高手回答一下,万分感谢!