pinvoke.net: Edit: netapi32.NetLocalGroupGetMembers

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Summary: 
Code to read the membership of Local Groups (ideally used with NetLocalGroupEnum )
 
!!!!C# Signature:
		/// <summary>
		/// The NetLocalGroupGetMembers function retrieves a list of the members of a particular local group in 
		/// the security database, which is the security accounts manager (SAM) database or, in the case 
		/// of domain controllers, the Active Directory. Local group members can be users or global groups.
		/// </summary>
		/// <param name="servername"></param>
		/// <param name="localgroupname"></param>
		/// <param name="level"></param>
		/// <param name="bufptr"></param>
		/// <param name="prefmaxlen"></param>
		/// <param name="entriesread"></param>
		/// <param name="totalentries"></param>
		/// <param name="resume_handle"></param>
		/// <returns></returns>
		[DllImport("NetAPI32.dll", CharSet=CharSet.Unicode)]
		public extern static int NetLocalGroupGetMembers(
			[MarshalAs(UnmanagedType.LPWStr)] string servername,
			[MarshalAs(UnmanagedType.LPWStr)] string localgroupname,
			int level,
			out IntPtr bufptr,
			int prefmaxlen,
			out int entriesread,
			out int totalentries,
			IntPtr resume_handle);
!!!!VB Signature:
 Declare Function NetLocalGroupGetMembers Lib "netapi32.dll" (TODO) As TODO
!!!!User-Defined Types:
	[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]
			public struct LOCALGROUP_MEMBERS_INFO_2 
		{
			public int lgrmi2_sid;
			public int lgrmi2_sidusage;
			public string lgrmi2_domainandname;
		} 
!!!!Notes:
None.

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

!!!!Sample Code:
		//Example code for a class file or dll( I used a dll)
		public static ArrayList GetLocalGroupMembers(string ServerName,string GroupName)
		{
			ArrayList myList = new ArrayList();
			int EntriesRead;
			int TotalEntries;
			int Resume  = IntPtr.Zero;
			IntPtr buffer;
			int val = NetLocalGroupGetMembers(ServerName, GroupName, 2, out bufPtr, -1, out EntriesRead, out TotalEntries, Resume);
			if(EntriesRead> 0)
			{
				LOCALGROUP_MEMBERS_INFO_2[] Members = new LOCALGROUP_MEMBERS_INFO_2[EntriesRead];
				IntPtr iter = bufPtr;
				for(int i=0; i < EntriesRead; i++)
				{
					Members[i] = (LOCALGROUP_MEMBERS_INFO_2)Marshal.PtrToStructure(iter, typeof(LOCALGROUP_MEMBERS_INFO_2)); 
					iter = (IntPtr)((int)iter + Marshal.SizeOf(typeof(LOCALGROUP_MEMBERS_INFO_2)));
					myList.Add(Members[i].lgrmi2_domainandname + "," + Members[i].lgrmi2_sidusage);
				}
				NetApiBufferFree(bufPtr);
			}
			return myList;
		}

////////////////////////////////////////////////////////////////////////////////////////////////////////
		//Example code for calling application
		ArrayList RetGroups = new ArrayList();
		RetGroups =DsDomain.GetLocalGroupMembers(null,"administrators");		
		string delimStr = ",";
		char [] delimiter = delimStr.ToCharArray();	
		foreach(string str in RetGroups)
	{		//I used this to retrieve the type of group so I could use an icon in a treeview if desired.
			//split[0] is the "domain\group or user", split[1] is the type, 1 for user, 2 for group.				
		string [] split = null;
		split = str.Split(delimiter);
		Console.WriteLine(split[0] + split[1]);
	}

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

Documentation: NetLocalGroupGetMembers@msdn on MSDN