转自:http://blog.csdn.net/guoqiang721029/archive/2005/03/18/322758.aspx
消息: WM_ACTIVATE
参数: fActive = LOWORD(wParam); // activation flag fMinimized = (BOOL)HIWORD(wParam); // minimized flag hwndPrevious= (HWND)lParam; // window handle
fActive 参数主要定义了该窗口发生了什么事情,即该窗口是被激活还是被取消。该信息保存在 wParam 的低阶字中,可以取以下的值:
-------------------------------------------------------------------------------------- 值 描述 -------------------------------------------------------------------------------------- WA_CLICKACTIVE 通过鼠标单击激活了该窗口 WA_ACTIVE 通过鼠标以外的工具(如键盘)激活了该窗口 WA_INACTIVE 取消该窗口的激活 --------------------------------------------------------------------------------------
示例代码:
case WM_ACTIVATE: { // test if window is being activated if(LOWORD(wParam)!=WA_INACTIVE) { // application is being activated } else { // application is being deactivated } } break;