Código de ejemplo para quitar el punto de conexión de RnR

El ejemplo de código siguiente lo usa el ejemplo de código del servicio Winsock para anular el registro del punto de conexión de RnR para el servicio.

#include <winsock2.h>
#include <stdio.h>
 
/***************************************************************************

    serverUnregister()

    Unregisters the RnR connection point for the specified service. 
    WSAStartup must be called before calling this function.

***************************************************************************/

INT serverUnregister(SOCKADDR *sa, 
                     GUID *pServiceID, 
                     LPTSTR pszServiceInstanceName, 
                     LPTSTR pszServiceInstanceComment)
{
    DWORD ret;
    WSAVERSION Version;
    WSAQUERYSET QuerySet;
    CSADDR_INFO CSAddrInfo[1];
    SOCKADDR sa_local;

    memset(&QuerySet, 0, sizeof(QuerySet));
    memset(&CSAddrInfo, 0, sizeof(CSAddrInfo));
    memset(&sa_local, 0, sizeof(SOCKADDR));
    sa_local.sa_family = AF_INET;

    // Build the CSAddrInfo structure to contain address
    // data. This is what clients use to create a connection.
    //
    // Be aware that the LocalAddr is set to zero because
    // dynamically assigned port numbers are used.
    //
    CSAddrInfo[0].LocalAddr.iSockaddrLength = sizeof(SOCKADDR);
    CSAddrInfo[0].LocalAddr.lpSockaddr = &sa_local;
    CSAddrInfo[0].RemoteAddr.iSockaddrLength = sizeof(SOCKADDR);
    CSAddrInfo[0].RemoteAddr.lpSockaddr = sa;
    CSAddrInfo[0].iSocketType = SOCK_STREAM;
    CSAddrInfo[0].iProtocol = PF_INET;

    QuerySet.dwSize = sizeof(WSAQUERYSET);
    QuerySet.lpServiceClassId = pServiceID;
    QuerySet.lpszServiceInstanceName = pszServiceInstanceName;
    QuerySet.lpszComment = pszServiceInstanceComment;
    QuerySet.lpVersion = &Version;
    QuerySet.lpVersion->dwVersion = 2;
    QuerySet.lpVersion->ecHow = COMP_NOTLESS;
    QuerySet.dwNameSpace = NS_NTDS;
    QuerySet.dwNumberOfCsAddrs = 1;
    QuerySet.lpcsaBuffer = CSAddrInfo;

    ret = WSASetService( &QuerySet,
                         RNRSERVICE_DEREGISTER,
                         SERVICE_MULTIPLE);

    return(ret);
}