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SOCKADDR_IN Structure

In the Internet address family, the SOCKADDR_IN structure is used by Windows Sockets to specify a local or remote endpoint address to which to connect a socket.

struct sockaddr_in{ 
   short sin_family; 
   unsigned short sin_port; 
   struct in_addr sin_addr; 
   char sin_zero[8]; 
};

sin_family

Address family (must be AF_INET).

sin_port

IP port.

sin_addr

IP address.

sin_zero

Padding to make structure the same size as SOCKADDR.

This is the form of the SOCKADDR structure specific to the Internet address family and can be cast to SOCKADDR.

The IP address component of this structure is of type IN_ADDR. The IN_ADDR structure is defined in Windows Sockets header file WINSOCK.H as follows:

struct in_addr {

union {

struct{

unsigned char s_b1,

s_b2,

s_b3,

s_b4;

} S_un_b;

struct {

unsigned short s_w1,

s_w2;

} S_un_w;

unsigned long S_addr;

} S_un;

};

Header: winsock2.h

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