在程序中打开/关闭monitor or lcd

最新推荐文章于 2024-12-28 11:40:31 发布

转载最新推荐文章于 2024-12-28 11:40:31 发布 · 252 阅读

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#运维 #c#

本文介绍如何使用 SendMessage 函数来控制 Windows 显示器的状态，包括关闭、打开和设置低电量模式。通过发送 WM_SYSCOMMAND 消息并指定 SC_MONITORPOWER 参数，可以实现对显示器电源的管理。

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hWnd
Handle to the window whose window procedure will receive the message. If you don't want to bother creating a window to send the message to, you can send the message to all top level windows (HWND_BROADCAST) or you can use GetDesktopWindow function sending the message to the desktop window.
Msg
Specifies the message to be sent (WM_SYSCOMMAND).
wParam
Specifies additional message-specific information (SC_MONITORPOWER).
lParam
- 1 - the display is going to low power.
- 2 - the display is being shut off.
- -1 - the display is being turned on (undocumented value).

// 关闭 monitor
Sleep(500); // Eliminate user's interaction for 500 ms
SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, (LPARAM) 2);
// 打开 monitor
SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, (LPARAM) -1);
// 电池模式,低电量
Sleep(500); // Eliminate user's interaction for 500 ms
SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, (LPARAM) 1);