c网络编程

#include <Winsock2.h>
#include <stdio.h>
#pragma   comment(lib,   "ws2_32.lib")

void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;

wVersionRequested = MAKEWORD( 2, 2 );

err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {                              
return;
}
if ( LOBYTE( wsaData.wVersion ) != 2 ||
        HIBYTE( wsaData.wVersion ) != 2 ) {
WSACleanup( );
return;
}
SOCKET client=socket(AF_INET,SOCK_STREAM,0);

SOCKADDR_IN addr_client;
addr_client.sin_family=AF_INET;
addr_client.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
addr_client.sin_port=htons(6000);

connect(client,(SOCKADDR *)&addr_client,sizeof(SOCKADDR));

char recvBuf[100];
recv(client,recvBuf,100,0);
printf("%s\n",recvBuf);


send(client,"this is zhangsan",strlen("this is zhangsan")+1,0);
closesocket(client);
WSACleanup();
}


#include <Winsock2.h>
#include <stdio.h>

void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;

wVersionRequested = MAKEWORD( 2, 2 );

err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {                              
return;
}
if ( LOBYTE( wsaData.wVersion ) != 2 ||
        HIBYTE( wsaData.wVersion ) != 2 ) {
WSACleanup( );
return;
}

SOCKET server=socket(AF_INET,SOCK_STREAM,0);

SOCKADDR_IN addr_server;
addr_server.sin_family=AF_INET;
addr_server.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
addr_server.sin_port=htons(6000);

bind(server,(SOCKADDR *)&addr_server,sizeof(SOCKADDR));

listen(server,5);

while(1)
{
SOCKADDR_IN addr_client;
int len=sizeof(SOCKADDR);
SOCKET conn=accept(server,(SOCKADDR *)&addr_client,&len);
char sendBuf[100];
sprintf(sendBuf,"welcome %s to my home",inet_ntoa(addr_client.sin_addr));
send(conn,sendBuf,100,0);
char revBuf[100];
recv(conn,revBuf,100,0);
printf("%s",revBuf);
}

}