static extern bool GetUserObjectInformation(IntPtr hObj, int nIndex,

  Private Shared Function GetUserObjectInformation(ByVal hObj As IntPtr, ByVal nIndex As Int32, ByRef pvInfo As Byte(), <MarshalAs(UnmanagedType.I4)> ByVal nLength As Int32, <MarshalAs(UnmanagedType.I4)> ByRef lpnLengthNeeded As Int32) As Boolean

    static extern bool GetUserObjectInformation(IntPtr hObj, int nIndex,

        if (GetUserObjectInformation(hdesk, UOI_HEAPSIZE, out heapsize, sizeof(ulong), out lengthNeeded))