Retrieves friends directory. 

This method can be accessed through the Friends.asmx file located in:

~/Workarea/webservices/WebServiceAPI/Community/Friends.asmx

[SoapHeader("AuthHeader")]
[SoapHeader("RequestInfoHeader")]
[WebMethod(MessageName = "GetFriendsDirectory", Description = "Retrieves friends directory.")]
public DirectoryAdvancedUserData GetFriendsDirectory(long userId, long directoryId, PagingInfo pagingInfo);

<SoapHeader("AuthHeader")>
<SoapHeader("RequestInfoHeader")>
<WebMethod(MessageName = "GetFriendsDirectory", Description = "Retrieves friends directory.")>
Public Function GetFriendsDirectory(userId As long, directoryId As long, pagingInfo As PagingInfo) As DirectoryAdvancedUserData