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WM_DESTROY 消息
当窗口将要被销毁时此消息会被发送。此消息收到时，窗口已经被从屏幕中移除，但是窗口资源还没有被销毁。
此消息先发往将要销毁的窗口，然后再被发送到其子窗口。处理这个消息时，应该假设子窗口还存在。一般通过 estroyWindow 函数销毁窗口。
声明：
#define WM_DESTROY 0x0002
参数
wParam
此参数不被使用
lParam
此参数不被使用
返回值
类型：LRESULT
如果应用程序处理了这个消息，应该返回0。
支持
| 最低桌面系统支持 | Windows 2000 Professional |
| 头文件 | Winuser.h (已包含在Windows.h中) |
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