Accessing TCP/IP Sockets Tutorial

This topic describes how to access TCP/IP sockets.


Client programs access TCP/IP sockets through the generic socket interface RSocket(). The RSocket() specifies the protocol-specific behaviour through argument values. This tutorial contains notes on the usage of RSocket() functions for TCP and UDP sockets.

The high level steps to access the TCP/IP sockets are as follows:


You must be familiar with RSocketServ() and RSocket() to understand this tutorial.


  1. The RSocket() function takes a number of parameters that determine the type of socket connection to provide.

    The following are the important parameters for TCP/IP or UDP:
    1. addrFamily
    2. sockType
    3. protocol
  2. The following constant values must be used for TCP/IP: addrFamily: KAfInet or KAfInet6 for IPv6 sockType: KSockStream for TCP/IP or KSockDatagram for UDP protocol: KProtocolInetTCP or KProtocolInetUDP


The following code is an example to access the TCP/IP socket:

void Example::open(void)
    TInt err;
    RSocketServ ss;
    RSocket sock;

    err = ss.Connect();
    err = sock.Open(ss, KAfInet, KSockStream, KProtocolInetTcp);
    // ... now connect to the socket to send and receive data

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