Winsock SPI Functions

The following list provides concise descriptions of each Winsock SPI function. For additional information on any Winsock SPI function, click the function name. For information about prefix conventions, see Winsock SPI. For information about the Winsock SPI usage, see About the Winsock SPI.

Winsock SPI function	Description
NSPCleanup	Terminates the use of a Winsock namespace service provider.
NSPGetServiceClassInfo	Retrieves class information (schema) pertaining to a specified namespace provider.
NSPInstallServiceClass	Registers service class schema within the namespace providers.
NSPIoctl	Sends an IOCTL to a namespace service provider.
NSPLookupServiceBegin	Initiates a client query of a namespace version 1 service provider that is constrained by information contained within a WSAQUERYSET structure.
NSPLookupServiceEnd	Frees a handle after previous calls to NSPLookupServiceBegin and NSPLookupServiceNext.
NSPLookupServiceNext	Retrieves requested information from a namespace version 1 service provider. This function is called only after obtaining a handle from a previous call to NSPLookupServiceBegin.
NSPRemoveServiceClass	Permanently removes a specified service class from the namespace.
NSPSetService	Registers or deregisters a service instance within a namespace.
NSPStartup	Retrieves dynamic information about a provider, such as the list of the DLL entry points.
NSPv2Cleanup	Notifies a namespace service provider version 2 (NSPv2) provider that a client session has terminated.
NSPv2ClientSessionRundown	Notifies a NSPv2 provider that the client session is terminating.
NSPv2LookupServiceBegin	Initiates a client query of NSPv2 service provider that is constrained by the information contained within a WSAQUERYSET2 structure.
NSPv2LookupServiceEnd	Frees a handle after previous calls to NSPv2LookupServiceBegin and NSPv2LookupServiceNextEx.
NSPv2LookupServiceNextEx	Retrieves the requested information from a NSPv2 provider. This function is called only after obtaining a handle from a previous call to NSPv2LookupServiceBegin.
NSPv2SetServiceEx	Registers or deregisters a name or service instance within a namespace of a NSPv2 provider.
NSPv2Startup	Notifies a NSPv2 provider that a new client process is to begin using the provider.
WPUCloseEvent	Closes an open event object handle.
WPUCloseSocketHandle	Closes an existing socket handle.
WPUCloseThread	Closes a thread opened with a call to WPUOpenCurrentThread.
WPUCompleteOverlappedRequest	Performs overlapped I/O completion notification for overlapped I/O operations.
WPUCreateEvent	Creates a new event object.
WPUCreateSocketHandle	Creates a new socket handle.
WPUFDIsSet	Checks the membership of the specified socket handle.
WPUGetProviderPath	Retrieves the DLL path for the specified provider.
WPUModifyIFSHandle	Receives a possibly modified IFS handle from Ws2_32.dll.
WPUOpenCurrentThread	Opens a handle to the current thread that can be used with overlapped functions in a layered service provider.
WPUPostMessage	Performs the standard Windows PostMessage function in a way that maintains backward compatibility with older versions of WSOCK32.dll.
WPUQueryBlockingCallback	Returns a pointer to a callback function the service provider should invoke periodically while servicing blocking operations.
WPUQuerySocketHandleContext	Queries the context value associated with the specified socket handle.
WPUQueueApc	Queues a user mode–asynchronous procedure call (APC) to the specified thread in order to facilitate invocation of overlapped I/O completion routines.
WPUResetEvent	Resets the state of the specified event object to nonsignaled.
WPUSetEvent	Sets the state of the specified event object to signaled.
WSAAdvertiseProvider	Makes a specific namespace version 2 provider available for all eligible clients.
WSAProviderCompleteAsyncCall	Notifies a client when an asynchronous call to a namespace version 2 provider is completed.
WSAUnadvertiseProvider	Makes a specific namespace version 2 provider no longer available for clients.
WSCDeinstallProvider	Removes the specified transport service provider from the system configuration database.
WSCDeinstallProvider32	Removes the specified 32-bit transport provider from the system configuration database on a 64-bit platform.
WSCEnableNSProvider	Enables or disables a specified namespace provider.
WSCEnableNSProvider32	Enables or disables a specified 32-bit namespace provider on a 64-bit platform.
WSCEnumNameSpaceProviders32	Returns information on available 32-bit namespace providers on a 64-bit platform.
WSCEnumNameSpaceProvidersEx32	Returns information on available 32-bit namespace providers on a 64-bit platform.
WSCEnumProtocols	Retrieves information about available transport protocols.
WSCEnumProtocols32	Retrieves information about available transport protocols in the 32-bit catalog on 64-bit platforms.
WSCGetApplicationCategory	Retrieves the layered service provider (LSP) categories associated with an application.
WSCGetProviderInfo	Retrieves the data associated with an information class for a layered service provider.
WSCGetProviderInfo32	Retrieves the data associated with an information class for a 32-bit layered service provider on a 64-bit platform.
WSCGetProviderPath	Retrieves the DLL path for the specified provider.
WSCGetProviderPath32	Retrieves the DLL path for the specified 32-bit provider on a 64-bit platform.
WSCInstallNameSpace	Installs a namespace provider.
WSCInstallNameSpace32	Installs a 32-bit namespace provider on a 64 bit platform.
WSCInstallNameSpaceEx	Installs a namespace provider.
WSCInstallNameSpaceEx32	Installs a 32-bit namespace provider on a 64 bit platform.
WSCInstallProvider	Installs a transport service provider into the system configuration database.
WSCInstallProvider64_32	Installs the specified transport service provider into the 32-bit and 64-bit system configuration databases on a 64-bit platform.
WSCInstallProviderAndChains	Installs a 32-bit transport service provider as well as its specific protocol chains into the system configuration database on a 32-bit platform.
WSCInstallProviderAndChains64_32	Installs the specified transport provider and its specific protocol chains into both the 32-bit and 64-bit system configuration databases on a 64-bit platform.
WSCSetApplicationCategory	Sets the permitted layered service provider categories associated with an application.
WSCSetProviderInfo	Sets the data value for the specified information class for a layered service provider.
WSCSetProviderInfo32	Sets the data value for the specified information class for a 32-bit layered service provider on a 64-bit platform.
WSCUnInstallNameSpace	Uninstalls a namespace provider.
WSCUnInstallNameSpace32	Uninstalls a specific 32-bit namespace provider on a 32-bit platform.
WSCUpdateProvider	Modifies a transport service provider in the system configuration database.
WSCUpdateProvider32	Modifies a 32-bit transport service provider in the system configuration database on a 64-bit platform.
WSCWriteNameSpaceOrder	Changes the order of available namespace providers.
WSCWriteNameSpaceOrder32	Changes the order of available Windows Sockets (Winsock) 2 namespace providers in a 32-bit catalog on a 64-bit platform.
WSCWriteProviderOrder	Re-orders available transport service providers.
WSCWriteProviderOrder32	Re-orders available transport service providers in a 32-bit catalog on a 64-bit platform.
WSPAccept	Conditionally accepts a connection based on the return value of a condition function.
WSPAddressToString	Converts all components of a sockaddr structure into a human readable–numeric string representation of the address.
WSPAsyncSelect	Requests Windows message-based event notification of network events for a socket.
WSPBind	Associates a local address with a socket.
WSPCancelBlockingCall	Cancels a blocking call that is currently in progress.
WSPCleanup	Terminates use of the Winsock service provider.
WSPCloseSocket	Closes a socket.
WSPConnect	Establishes a connection to a peer, exchanges connect data, and specifies needed quality of service based on the supplied flow specification.
WSPDuplicateSocket	Returns a WSAPROTOCOL_INFO structure that can be used to create a new socket descriptor for a shared socket.
WSPEnumNetworkEvents	Reports occurrences of network events for the indicated socket.
WSPEventSelect	Specifies an event object to be associated with the supplied set of network events.
WSPGetOverlappedResult	Returns the results of an overlapped operation on the specified socket.
WSPGetPeerName	Retrieves the address of the peer to which a socket is connected.
WSPGetQOSByName	Initializes a QOS structure based on a named template, or retrieves an enumeration of the available template names.
WSPGetSockName	Retrieves the local name for a socket.
WSPGetSockOpt	Retrieves a socket option.
WSPIoctl	Controls the mode of a socket.
WSPJoinLeaf	Joins a leaf node into a multipoint session, exchanges connect data, and specifies needed quality of service based on the supplied flow specifications.
WSPListen	Establishes a socket to listen for incoming connections.
WSPRecv	Receives data on a socket.
WSPRecvDisconnect	Terminates reception on a socket, and if the socket is connection oriented, retrieves the disconnect data.
WSPRecvFrom	Receives a datagram and stores the source address.
WSPSelect	Determines the status of one or more sockets.
WSPSend	Sends data on a connected socket.
WSPSendDisconnect	Initiates termination of the connection for a socket and sends disconnect data.
WSPSendTo	Sends data to a specific destination using overlapped I/O.
WSPSetSockOpt	Sets a socket option.
WSPShutdown	Disables sends and/or receives on a socket.
WSPSocket	Creates a socket.
WSPStartup	Initiates use of a Winsock service provider by a client.
WSPStringToAddress	Converts a human-readable numeric string to a socket address structure suitable for passing to Winsock interface that take such a structure.

 

32-bit SPI Functions for 64-bit Platforms

Note

These calls are strictly 32-bit versions of native WSC function calls for use on 64-bit platforms by 32-bit processes. The definitions and semantics of these specific 32-bit calls are the same as their native counterparts.

 

32-bit Winsock SPI function	Description
WSCDeinstallProvider32	Removes the specified 32-bit transport service provider from the system configuration database on a 64-bit platform.
WSCEnableNSProvider32	Changes the state of a given 32-bit namespace provider on a 64-bit platform.
WSCEnumNameSpaceProviders32	Returns a set of available 32-bit namespace providers on a 64-bit platform.
WSCEnumNameSpaceProvidersEx32	Returns information on available 32-bit namespace providers on a 64-bit platform.
WSCEnumProtocols32	Retrieves information about available 32-bit transport protocols on a 64-bit platform.
WSCGetProviderInfo32	Retrieves the data associated with an information class for a 32-bit layered service provider on a 64-bit platform.
WSCGetProviderPath32	Retrieves the DLL path for the specified 32-bit provider on a 64-bit platform.
WSCInstallNameSpace32	Installs a 32-bit namespace provider on a 64-bit platform.
WSCInstallNameSpaceEx32	Installs a namespace provider.
WSCInstallProvider64_32	Installs a transport service provider into the 32-bit and 64-bit system configuration databases on a 64-bit platform.
WSCInstallProviderAndChains64_32	Installs a transport service provider and its specific protocol chains into both the 32-bit and 64-bit system configuration databases on a 64-bit platform.
WSCSetProviderInfo32	Sets the data value for specified information class for a layered service provider on a 64-bit platform.
WSCUnInstallNameSpace32	Uninstalls a 32-bit namespace provider on a 64-bit platform.
WSCUpdateProvider32	Modifies a 32-bit transport service provider in the system configuration database on a 64-bit platform.
WSCWriteNameSpaceOrder32	Modifies the order of available namespace providers in a 32-bit catalog on a 64-bit platform.