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DefWindowProc 函数
以默认的方式，处理应用程序不处理的任何窗口消息。这个函数用来确保每个消息都被处理。DefWindowProc应该以窗口过程 WindowProc 同样的参数被调用。
函数原型：
LRESULT WINAPI DefWindowProc (
HWND hWnd,UINT Msg,WPARAM wParam,LPARAM lParam );
参数
hWnd
类型：HWND
消息所属窗口的句柄。
Msg
类型：UINT
消息
wParam
类型：WPARAM
消息附加值，意义取决于具体消息。
lParam
类型：LPARAM
消息附加值，意义取决于具体消息。
返回值
类型：LRESULT
成功值是消息的处理结果，意义取决于具体消息。
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) |
| 库 | User32.lib |
| DLL | User32.dll |
| UNICODE版本名 | DefWindowProcW |
| ANSI版本名 | DefWindowProcA |
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