See Also
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Winsock provides the following functions to perform name space query operations:
The WSAEnumNameSpaceProvidersfunction allows an application to discover which namespaces are accessible through Winsock name resolution facilities. It also allows an application to determine whether a given namespace is supported by more than one namespace provider, and to discover the provider identifier for any particular namespace provider. Using a provider identifier, the application can restrict a query operation to a specified namespace provider.
Winsock namespace query operations involve a series of calls: WSALookupServiceBegin, followed by one or more calls to WSALookupServiceNextand ending with a call to WSALookupServiceEnd. WSALookupServiceBegintakes a WSAQUERYSETstructure as input to define the query parameters along with a set of flags to provide additional control over the search operation. It returns a query handle which is used in the subsequent calls to WSALookupServiceNextand WSALookupServiceEnd.
The application invokes WSALookupServiceNextto obtain query results, with results supplied in an application-supplied WSAQUERYSETbuffer. The application continues to call WSALookupServiceNextuntil the error code WSA_E_NO_MORE is returned indicating that all results have been retrieved. The search is then terminated by a call to WSALookupServiceEnd. The WSALookupServiceEndfunction can also be used to cancel a currently pending WSALookupServiceNextwhen called from another thread.