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        res = PowerReadFriendlyName(IntPtr.Zero, ptrActiveGuid, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, ref buffSize);

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            res = PowerReadFriendlyName(IntPtr.Zero, ptrActiveGuid, IntPtr.Zero, IntPtr.Zero, ptrName, ref buffSize);

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    public static extern UInt32 PowerReadFriendlyName(

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    public static extern UInt32 PowerReadFriendlyName(

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Private Declare Function PowerReadFriendlyName Lib "powrprof.dll" Alias _

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    "PowerReadFriendlyName" (RootPowerKey As IntPtr, ByRef SchemeGuid As Guid, _

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        res = PowerReadFriendlyName(IntPtr.Zero, ptrActiveGuid, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, ref buffSize);

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            res = PowerReadFriendlyName(IntPtr.Zero, ptrActiveGuid, IntPtr.Zero, IntPtr.Zero, ptrName, ref buffSize);

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Documentation

[PowerReadFriendlyName] on MSDN