VC++ TCP/UDP通信程序

今天开始学习在VC++上socket编程，先把代码贴上，备忘一下······

注意：因为本程序使用了WinSock库的函数，按照动态链接库的使用方法之一，这时还需要为程序链接相应的.lib文件。本程序是在VC++6.0下开发的，这里要为本程序链接相应的库文件：ws2_32.lib。方法是选择【project\Seting...】菜单项，并在弹出的Project Setting对话框上选择Link选项卡，然后在Object/library modules编辑框中添加ws2_32.lib文件。输入的库文件与前面的库文件之间一定要有空格。

1.TCP服务端代码：

#include <winsock2.h>

#include <stdio.h>

void main()

{

//加载套接字库

WORD wVersionRequested;

WSADATA wsaData;

int err;

wVersionRequested = MAKEWORD(1, 1);

err = WSAStartup(wVersionRequested, &wsaData);

if (err != 0) {

return;

}

if (LOBYTE(wsaData.wVersion) != 1 ||

HIBYTE(wsaData.wVersion) != 1) {

WSACleanup();

return;

}

//创建用于监听的套接字

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

SOCKADDR_IN addrSrv;

addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);

addrSrv.sin_family = AF_INET;

addrSrv.sin_port = htons(6000);

//绑定套接字

bind(sockSrv, (SOCKADDR *)&addrSrv, sizeof(SOCKADDR));

//将套接字设为监听模式，准备接收客户请求

listen(sockSrv, 5);

SOCKADDR_IN addrClient;

int len = sizeof(SOCKADDR);

while (1)

{

//等待客户端请求到来

SOCKET sockConn = accept(sockSrv, (SOCKADDR *)&addrClient, &len);

char sendBuf[100];

sprintf(sendBuf, "Welcome %s to http://www.sunxin.org", 

inet_ntoa(addrClient.sin_addr));

//发送数据

send(sockConn, sendBuf, strlen(sendBuf) + 1, 0);

char recvBuf[100];

//接受数据

recv(sockConn, recvBuf, 100, 0);

//打印接收的数据

printf("%s\n", recvBuf);

//关闭套接字

closesocket(sockConn);

}

}

2.TCP客户端代码：

#include <winsock2.h>

#include <stdio.h>

void main()

{

//加载套接字库

WORD wVersionRequested;

WSADATA wsaData;

int err;

wVersionRequested = MAKEWORD(1, 1);

err = WSAStartup(wVersionRequested, &wsaData);

if (err != 0) {

return;

}

if (LOBYTE(wsaData.wVersion) != 1 ||

HIBYTE(wsaData.wVersion) != 1) {

WSACleanup();

return;

}

//创建套接字

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

SOCKADDR_IN addrSrv;

addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

addrSrv.sin_family = AF_INET;

addrSrv.sin_port = htons(6000);

//向服务器发出连接请求

connect(sockClient, (SOCKADDR *)&addrSrv, sizeof(SOCKADDR));

//接收数据

char recvBuf[100];

recv(sockClient, recvBuf, 100, 0);

printf("%s\n", recvBuf);

//发送数据

send(sockClient, "This is lisi", strlen("This is lisi")+1, 0);

//关闭套接字

closesocket(sockClient);

WSACleanup();

}

3.UDP服务端代码：

＃i nclude "Winsock2.h"
＃i nclude "stdio.h"
 
void main()
{
//初始化socket库
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD( 1, 1 );
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) 
{
   return;
}
if ( LOBYTE( wsaData.wVersion ) != 1 ||
        HIBYTE( wsaData.wVersion ) != 1 ) 
{
   WSACleanup( );
   return; 
}
 
SOCKET sockSrv = socket( AF_INET , SOCK_DGRAM , 0 ) ;
 
SOCKADDR_IN addrSrv ;
addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY) ;
addrSrv.sin_family = AF_INET ;
addrSrv.sin_port = htons(4000) ;
 
bind( sockSrv , (SOCKADDR*)&addrSrv , sizeof(SOCKADDR) ) ;
 
char sendBuf[100] ;
char recvBuf[100] ;
char tempBuf[200] ;
 
SOCKADDR_IN addrClient ;
int len = sizeof(SOCKADDR) ;
 
while (1)
{
   recvfrom(sockSrv,recvBuf,100,0,(SOCKADDR*)&addrClient,&len) ;
   if ( 'q' == recvBuf[0] )
   {
    sendto(sockSrv,"q",strlen("q")+1,0,(SOCKADDR*)&addrClient,len) ;
    printf("chat end!\n") ;
    break ;
   }
 
   sprintf(tempBuf,"%s say : %s",inet_ntoa(addrClient.sin_addr),recvBuf) ;
   printf( "%s\n" , tempBuf ) ;
   printf( "Please input data:\n" ) ;
   gets( sendBuf ) ;
   sendto(sockSrv,sendBuf,strlen(sendBuf)+1,0,(SOCKADDR*)&addrClient,len) ;
}
 
closesocket( sockSrv ) ;
WSACleanup() ;
}

4.UDP客户端代码：

＃i nclude "Winsock2.h"
＃i nclude "stdio.h"
 
void main()
{
//³õʼ»¯socket¿â
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD( 1, 1 );
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) 
{
   return;
}
if ( LOBYTE( wsaData.wVersion ) != 1 ||
        HIBYTE( wsaData.wVersion ) != 1 ) 
{
   WSACleanup( );
   return; 
}
 
SOCKET sockClient = socket( AF_INET , SOCK_DGRAM , 0 ) ;
 
SOCKADDR_IN addrSrv ;
addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1") ;
addrSrv.sin_family = AF_INET ;
addrSrv.sin_port = htons(4000) ;
 
char sendBuf[100] ;
char recvBuf[100] ;
char tempBuf[200] ;
 
int len = sizeof(SOCKADDR) ;
 
while (1)
{
   printf("Please input data:\n");
   gets( sendBuf ) ;
   sendto( sockClient , sendBuf , strlen(sendBuf) , 0 , 
     (SOCKADDR*)&addrSrv , len ) ;
 
   recvfrom( sockClient , recvBuf , 100 , 0 , (SOCKADDR*)&addrSrv , &len ) ;
   if ( 'q' == recvBuf[0] )
   {
    sendto(sockClient , "q" , strlen("q")+1 , 0 , (SOCKADDR*)&addrSrv , len) ;
    printf("chat end!") ;
    break ;
   }
   sprintf( tempBuf , "%s say: %s\n" , inet_ntoa(addrSrv.sin_addr) , recvBuf ) ;
   printf( tempBuf ) ;
}
 
closesocket(sockClient) ;
WSACleanup() ;
}