pinvoke.net: Edit: powrprof.PowerGetActiveScheme

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Summary: Retrieves current power scheme GUID for Windows Vista

!!!!C# Signature:
        [DllImport("powrprof.dll")]
        public static extern UInt32 PowerGetActiveScheme(IntPtr UserRootPowerKey, ref IntPtr ActivePolicyGuid);
!!!!VB Signature:
        Declare Function PowerGetActiveScheme Lib "powrprof.dll" (ByVal UserRootPowerKey As IntPtr, ByRef ActivePolicyGuid As IntPtr) As Integer
!!!!User-Defined Types:
None.

!!!!Alternative Managed API:
Do you know one?  Please contribute it!

!!!!Notes:
None.

!!!!Tips & Tricks:
Please add some!

!!!!Sample Code:
        private string GetCurrentPowerSchemeVistaAPI()
        {
            IntPtr ptrActiveGuid = IntPtr.Zero;
            uint res = PowerGetActiveScheme(IntPtr.Zero, ref ptrActiveGuid);
            if (res == 0)
            {
                uint buffSize = 0;
                res = PowerReadFriendlyName(IntPtr.Zero, ptrActiveGuid, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, ref buffSize);
                if (res == 0)
                {
                    IntPtr ptrName = Marshal.AllocHGlobal((int)buffSize);
                    res = PowerReadFriendlyName(IntPtr.Zero, ptrActiveGuid, IntPtr.Zero, IntPtr.Zero, ptrName, ref buffSize);
                    if (res == 0)
                    {
                        string ret = Marshal.PtrToStringUni(ptrName);
                        Marshal.FreeHGlobal(ptrName);
                        return ret;
                    }
                    Marshal.FreeHGlobal(ptrName);
                }
            }
            throw new Exception("Error reading current power scheme. Native Win32 error code = " + res);
        }

Documentation: PowerGetActiveScheme@msdn on MSDN