How to use .NET to Turn the Monitor back on after the Idle Timer has Turned it Off?
Question
How do I turn the monitor back on after the idle timer has turned it off? I have power options in windows 7 set to:
Turn off monitor after: 1 minute
Go to sleep: Never
But I don't know how to turn it back on through code.
2 answers
solution1
1 2009-09-15 22:24:20
This looks promising: http://www.codeproject.com/KB/cs/Monitor_management_guide.aspx
It uses the"SendMessage" API call:
SC_MONITORPOWER Sets the state of the display. This command supports devices that have power-saving features, such as a battery-powered personal computer. The lParam parameter can have the following values:
-1 - the display is powering on
1 - the display is going to low power
2 - the display is being shut off
solution2
0 2009-09-15 22:26:36
Do you need to turn it on, or just prevent it from turning off? If the latter, you can use the WinAPI:
SetThreadExecutionState(ES_DISPLAY_REQUIRED)
I don't think that there is a .net wrapper built in, but you should be able to pInvoke it.
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