在程序中打开/关闭monitor or lcd

  • 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);



ref
 vc版本: http://www.codeproject.com/KB/system/display_states.aspx
C# 版本: http://www.codeproject.com/KB/cs/Monitor_management_guide.aspx
posted @ 2008-02-24 09:21  margiex  阅读(472)  评论(0)  编辑  收藏  举报