我需要从睡眠中唤醒PC以使用C#执行某些操作。
我使用过CreateWaitableTimer
个函数,一切都很顺利。在给定时间,PC唤醒但显示器仍处于省电模式(关闭)!
所以我想知道,唤醒后如何打开显示器?
PS我尝试过“关于如何打开/关闭显示器/待机状态的完整指南” - 使用SendMessage(Codeproject)和SetThreadExecutionState(ES_DISPLAY_REQUIRED) - 它对我不起作用。
有什么想法吗?
答案 0 :(得分:1)
对我而言,使用pinvoke调用SendMessage
可以正常工作
csharp的代码示例:
using System;
using System.Runtime.InteropServices;
namespace MyDummyNamespace
{
class MyProgram
{
private static int Main(string[] args)
{
// your program code here
// ...
NativeMethods.MonitorOff();
System.Threading.Thread.Sleep(5000);
NativeMethods.MonitorOn();
return 0;
}
private static class NativeMethods
{
internal static void MonitorOn()
{
SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, (IntPtr)MONITOR_ON);
}
internal static void MonitorOff()
{
SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, (IntPtr)MONITOR_OFF);
}
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);
private static int MONITOR_ON = -1;
private static int MONITOR_OFF = 2;
private static int MONITOR_STANBY = 1;
private static IntPtr HWND_BROADCAST = new IntPtr(0xffff);
private static UInt32 WM_SYSCOMMAND = 0x0112;
private static IntPtr SC_MONITORPOWER = new IntPtr(0xF170);
}
}
}
以上解决方案的灵感来自这个答案:https://stackoverflow.com/a/332733/1468842
答案 1 :(得分:0)
尝试移动鼠标。当我通过键盘敲击唤醒我的Windows 7系统时,屏幕保持黑色,直到我移动鼠标。
Cursor.Position = new Point(x, y);