简单的网络管理代码

#include< stdio.h >

#include< stdlib.h >

#include< windows.h >

#include< winsock.h >

#include< string.h >

 

#pragma comment( lib, "ws2_32.lib" )

 

#define PORT 2046

#define MAXDATASIZE 100

 

 

void main( void )

{

 

int iClientSock;

struct sockaddr_in ServerAddr;

 

int numbytes;

char buf[ MAXDATASIZE ] = { "y" };

 

WSADATA WSAData;

if( WSAStartup( MAKEWORD( 1, 1 ), &WSAData ) )

{

printf( "initializationing error!\n" );

WSACleanup( );

exit( 0 );

}

 

if( ( iClientSock = socket( AF_INET, SOCK_DGRAM, 0 ) ) == -1 )

{

printf( " 创建套接字失败 !\n" );

WSACleanup( );

exit( 0 );

}

 

ServerAddr.sin_family = AF_INET;

ServerAddr.sin_port = htons( PORT );

ServerAddr.sin_addr.s_addr = inet_addr( "127.0.0.1" );// 记得换 IP

memset( &( ServerAddr.sin_zero ), 0, sizeof( ServerAddr.sin_zero ) );

 

 

numbytes = sendto( iClientSock, buf, strlen( buf ), 0, ( struct sockaddr * ) & ServerAddr, sizeof( struct sockaddr ) );

if( numbytes == -1 )

{

printf( "sendto 调用失败 !\n" );

WSACleanup( );

exit( 0 );

}

 

printf( "sent %d bytes to %s\n", numbytes, inet_ntoa( ServerAddr.sin_addr ) );

 

closesocket( iClientSock );

WSACleanup( );

}