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ExtEscape (coredll)

coredll is for smart devices, not desktop Windows. Therefore, this information only applies to code using the .NET Compact Framework. To see if information for ExtEscape in other DLLs exists, click on Find References to the right.

TODO - a short description

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,


// 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;



Tips & Tricks:

Please add some!

Sample Code:

public static void PowerOff()


    IntPtr hdc = GetDC(IntPtr.Zero);

    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);



private static extern IntPtr GetDC(IntPtr hwnd);

Alternative Managed API:

Do you know one? Please contribute it!

ExtEscape @msdn on MSDN

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