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UpdateWindow
如果窗口更新的区域不为空，UpdateWindow函数通过发送一个 WM_PAINT 消息来更新指定窗口的客户区。函数绕过应用程序的消息队列，直接发送 WM_PAINT 消息给指定窗口的窗口过程，如果更新区域为空，则不发送消息。
函数原型：
BOOL UpdateWindow ( HWND hWnd );
参数
hWnd
类型：HWND
将要被更新的窗口句柄。
返回值
类型：BOOL
如果成功，返回非0。
如果失败，返回0。
如果失败，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) |
| 库 | User32.lib |
| DLL | User32.dll |
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