Detecting if the monitor is on or off?

[motionman95]

Using swfkit, can I listen to GUID_MONITOR_POWER_ON and detect when the monitor is on or off? I'm in XP.

GUID_MONITOR_POWER_ON - 02731015-4510-4526-99e6-e5a17ebd1aea

The monitor on/off notification indicates when the primary system monitor is on or off. This notification is useful for components that actively render content to the display device, such as media visualization. These applications should register for this notification and stop rendering graphics content when the monitor is off to reduce system power consumption. The Data member is a DWORD that indicates the current monitor state.

0x0

The monitor is off.
0x1

The monitor is on.

[SWFKit]

This feature is only available in vista or windows server 2008.

[motionman95]

What about WM_SYSCOMMAND SC_MONITORPOWER?

[SWFKit]

I'm sorry this problem is difficult, as well as the "detecting standing by" one.

[SWFKit]

Fortunately for this problem the following code seems to work well.

dllimport "kernel32.dll" stdcall long GetDevicePowerState(long, long*);
dllimport "kernel32.dll" stdcall long CreateFileA(String, long, long, long, long, long, long) as CreateFile;

var GENERIC_READ = 0x80000000;
var GENERIC_WRITE = 0x40000000;
var OPEN_EXISTING = 3;

dl = CreateFile("\\\\.\\LCD", GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0);
trace(dl);
var state = new Object;
state.value = false;
result = GetDevicePowerState(dl, state);
if (!result) trace("the method has failed!");
else trace("The state of the monitor is ", state.value ? "on" : "off");

[motionman95]

Is there a way to constantly trace the value of this? Or detect when it's value changes?

[SWFKit]

Originally Posted by motionman95

Is there a way to constantly trace the value of this? Or detect when it's value changes?

You can write a detecting function, and run it at some regular intervals, say every second, by calling the setInterval method.