C# Signature:

[DllImport("coredll.dll", SetLastError=true)]
static extern int ExtEscape (IntPtr hdc, uint nEscape, uint cbInput, byte[] lpszInData, int cbOutput, IntPtr lpszOutData);

User-Defined Types:

public enum VideoPowerState : uint

{

    VideoPowerOn = 1,
    VideoPowerStandBy,
    VideoPowerSuspend,
    VideoPowerOff

}

// GDI Escapes for ExtEscape()

private const uint QUERYESCSUPPORT = 8;

// The following are unique to CE

private const uint GETVFRAMEPHYSICAL = 6144;

private const uint GETVFRAMELEN = 6145;

private const uint DBGDRIVERSTAT = 6146;

private const uint SETPOWERMANAGEMENT = 6147;

private const uint GETPOWERMANAGEMENT = 6148;

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

public static void PowerOff()

{

    IntPtr hdc = GetDC(IntPtr.Zero);
    uint func = SETPOWERMANAGEMENT;

    uint size = 12;
    byte[] vpm = new byte[size];

    //structure size
    BitConverter.GetBytes(size).CopyTo(vpm, 0);
    //dpms version
    BitConverter.GetBytes(0x0001).CopyTo(vpm, 4);
    //power state
    BitConverter.GetBytes((uint)VideoPowerState.VideoPowerOff).CopyTo(vpm, 8);

    ExtEscapeSet(hdc, SETPOWERMANAGEMENT, size, vpm, 0, IntPtr.Zero);

}

[DllImport("coredll")]

private static extern IntPtr GetDC(IntPtr hwnd);

Alternative Managed API:

Do you know one? Please contribute it!

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnppc2k/html/ppc_layoff.asp

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