Helper Functions in the SPI
The NSPGetServiceClassInfo function retrieves service class schema information that has been retained by a namespace provider. It is also used by the Windows Sockets 2 DLL in its implementation of WSAGetServiceClassNameByClassId.
The following macros defined in the Svcguid.h header file and can aid in mapping between well known service classes and these namespaces.
| Macro name | Description |
|---|---|
| SVCID_TCP(Port) SVCID_UDP(Port) |
Given a TCP or UDP port for the Internet protocol, returns the GUID. |
| IS_SVCID_TCP(GUID) IS_SVCID_UDP(GUID) |
Returns TRUE if the GUID for TCP or UDP is within the allowable range. |
| PORT_FROM_SVCID_TCP(GUID) PORT_FROM_SVCID_UDP(GUID) |
Returns the TCP or UDP port associated with the GUID. |
| SVCID_NETWARE(SAPID) |
Given the Service Advertising Protocol (SAP) identifier, returns the GUID. This macro is used with the SAP namespace within a NetWare environment. |
| SAPID_FROM_SVCID_NETWARE(GUID) |
Returns the NetWare SAP identifier associated with the GUID. This macro is used with the SAP namespace within a NetWare environment. |
| IS_SVCID_NETWARE(GUID) |
Returns TRUE if the GUID for NetWare is within the allowable range. This macro is used with the SAP namespace within a NetWare environment. |
Note
The Svcguid.h header file is not automatically included by the Winsock2.h header file.