Is there a Windows API that can be used to determine whether monitor is off or on?

[Charles Chang]

Hello,

As the subject.

Charles

 

[Lau Lei Cheong]

Seems not.

http://msdn.microsoft.com/library/en-us/power/base/getdevicepowerstate.asp?frame=true
The GetDevicePowerState function retrieves the current power state of the
specified device. This function cannot be used to query the power state of a
display device.