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PostMessage 函数
向创建标识窗口的线程发送一个消息。此函数会在发送完消息立即返回，而不等待线程处理发送的消息。
如果发送线程消息，可使用函数 PostThreadMessage 。
函数原型：
BOOL WINAPI PostMessage (
HWND hWnd,UINT Msg,WPARAM wParam,LPARAM lParam );
参数
hWnd
类型：HWND
接收消息的窗口句柄。如果这个参数是 HWND_BROADCAST ((HWND)0xffff)，消息被发送到系统的最顶层窗口。如果是NULL，像参数 dwThreadId被设置成当前线程标识符一样调用 PostThreadMessage 函数。
Msg
类型：UINT
被发送的消息值
wParam
类型：WPARAM
消息附加值
lParam
类型：LPARAM
消息附加值
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。
备注
如果需要消息处理结果，可使用函数 SendMessage 。
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 | PostMessageW |
| ANSI版本名 | PostMessageA |
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