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WindowProc
由应用程序定义的，用来处理窗口消息的函数。也常被称为窗口过程。
注意：函数名可开发者自定义，只需要函数原型符合，且及时传递正确函数指针等条件符合即可。
函数原型：
LRESULT CALLBACK WindowProc ( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
参数
hwnd
类型：HWND
消息所属的窗口句柄。
uMsg
wParam
类型：WPARAM
消息的附加参数，意义取决于具体的消息值。
lParam
类型：LPARAM
消息的附加参数，意义取决于具体的消息值。
返回值
类型：ATOM
返回值依据具体消息意义有所不同。对于初学者，常用的消息，如果自己处理过返回0，不过这并不严谨，尽量查阅具体消息使用说明。
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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