Example Code for Using Ranging to Retrieve Members of a Group

The following code example contains a subroutine that uses ranging with ActiveX Directory Objects (ADO) to retrieve the members of a group.

Private Sub EnumGroupWithADO(strGroupDN As String, strUsername As String, strPassword As String)
	Set oConn = CreateObject("ADODB.Connection")
	Set oComm = CreateObject("ADODB.Command")
	 
	oConn.Provider = "ADsDSOObject"
	oConn.Properties("ADSI Flag") = 1

	If strUsername <> "" Then
		oConn.Properties("User ID") = strUsername
		oConn.Properties("Password") = strPassword
	End If
	 
	oConn.Open
	oComm.ActiveConnection = oConn
	 
	' For compatibility with all operating systems, the number of objects
	' retrieved by each query should not exceed 999.
	rangeStep = 999

	lastLoop = False
	lowRange = 0
	highRange = lowRange + rangeStep

	commandPrefix = "<LDAP://" & strGroupDN & ">;(objectClass=*);member;range="
	commandSuffix = ";base"
	 
	Do
		If lastLoop Then
			' Perform this query with the "range=<lowRange>-*" range.
			oComm.CommandText = commandPrefix & lowRange & "-*" & commandSuffix
		Else
			' Perform this query with the "range=<lowRange>-<highRange>" range.
			oComm.CommandText = commandPrefix & lowRange & "-" & highRange & commandSuffix
		End If
		Debug.Print "Current search command: " & oComm.CommandText
	
		' Execute the query.
		Set oRS = oComm.Execute
	
		' Reset the retrieved members counter.
		nRetrieved = 0
	
		' Enumerate the retrieved members.
		While Not oRS.EOF
			For Each oField In oRS.Fields
				If VarType(oField) = (vbArray + vbVariant) Then
					For Each oValue In oField.Value
						Debug.Print vbTab & oValue
						nRetrieved = nRetrieved + 1
					Next
				End If
			Next
			oRS.MoveNext
		Wend
	
		' If the last query was just performed, exit the loop.
		If lastLoop = True Then
			Exit Do
		End If
	
		If nRetrieved = 0 Then
			' No objects were retrieved by the last query, so perform one last query
			' with the "range=<lowRange>-*" range.
			lastLoop = True
		Else
			' Increment the high and low ranges to query for the next block of objects.
			lowRange = highRange + 1
			highRange = lowRange + rangeStep
		End If
	Loop While True

End Sub