WSAGetServiceClassInfo Function
The WSAGetServiceClassInfo function retrieves the class information (schema) pertaining to a specified service class from a specified namespace provider.
Syntax
INT WSAGetServiceClassInfo(
__in LPGUID lpProviderId,
__in LPGUID lpServiceClassId,
__inout LPDWORD lpdwBufferLength,
__out LPWSASERVICECLASSINFO lpServiceClassInfo
);
Parameter
lpProviderId [in]
A pointer to a GUID that identifies a specific namespace provider.lpServiceClassId [in]
A pointer to a GUID identifying the service class.lpdwBufferLength [in, out]
On input, the number of bytes contained in the buffer pointed to by the lpServiceClassInfo parameter.On output, if the function fails and the error is WSAEFAULT, this parameter specifies the minimum size, in bytes, of the buffer pointed to lpServiceClassInfo needed to retrieve the record.
lpServiceClassInfo [out]
A pointer to a WSASERVICECLASSINFO structure that contains the service class information from the indicated namespace provider for the specified service class.
Rückgabewert
The return value is zero if the WSAGetServiceClassInfo was successful. Otherwise, the value SOCKET_ERROR is returned, and a specific error number can be retrieved by calling WSAGetLastError.
| Error code | Meaning |
|---|---|
| WSA_NOT_ENOUGH_MEMORY | There was insufficient memory to perform the operation. |
| WSAEACCES | The calling routine does not have sufficient privileges to access the information. |
| WSAEFAULT | The buffer pointed to by the lpServiceClassInfo parameter is too small to contain a WSASERVICECLASSINFOW. The application needs to pass in a larger buffer. |
| WSAEINVAL | The specified service class identifier or namespace provider identifier is not valid. This error is returned if the lpProviderId, lpServiceClassId, lpdwBufSize, or lpServiceClassInfo parameters are NULL. |
| WSAEOPNOTSUPP | The operation is not supported for the type of object referenced. This error is returned by some namespace providers that do not support getting service class information. |
| WSANO_DATA | The requested name is valid, but no data of the requested type was found. |
| WSANOTINITIALISED | The WS2_32.DLL has not been initialized. The application must first call WSAStartup before calling any Windows Sockets functions. |
| WSATYPE_NOT_FOUND | The specified class was not found. |
Hinweise
The WSAGetServiceClassInfo function retrieves service class information from a namespace provider. The service class information retrieved from a particular namespace provider might not be the complete set of class information that was specified when the service class was installed. Individual namespace providers are only required to retain service class information that is applicable to the namespaces that they support. See the section Service Class Data Structures for more information.
Anforderungen
Mindestens unterstützter Client |
Windows 2000 Professional |
Mindestens unterstützter Server |
Windows 2000 Server |
Header |
Winsock2.h |
Bibliothek |
Ws2_32.lib |
DLL |
Ws2_32.dll |
Unicode- und ANSI-Namen |
WSAGetServiceClassInfoW (Unicode) and WSAGetServiceClassInfoA (ANSI) |