Name Resolution Functions (Windows Embedded CE 6.0)
1/6/2010
Winsock provides the following functions to perform name space query operations:
The WSAEnumNameSpaceProviders function 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 WSALookupServiceNext and ending with a call to WSALookupServiceEnd. WSALookupServiceBegin takes a WSAQUERYSET structure 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 WSALookupServiceNext and WSALookupServiceEnd.
The application invokes WSALookupServiceNext to obtain query results, with results supplied in an application-supplied WSAQUERYSET buffer. The application continues to call WSALookupServiceNext until 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 WSALookupServiceEnd function can also be used to cancel a currently pending WSALookupServiceNext when called from another thread.