最简单的Windows套接字(Socket)例子（源码，实例）

最简单的Windows套接字(Socket)例子（源码，实例） 佟强(http://blog.csdn.net/microtong) 2008年11月21日

Server.exe PortNumber，例如Server 8000

Client.exe IPAddress PortNumber，例如Client 127.0.0.1 8000

然后在客户端的命令行输入字符串并回车，客户端将会把消息发送到服务器，服务器再把消息传回客户端。

服务器端，Server.cpp

//Server.cpp

#include <winsock2.h>

#include <stdio.h>

#include <windows.h>

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

int main(int argc, char* argv[]){

//判断是否输入了端口号

if(argc!=2){

printf("Usage: %s PortNumber/n",argv[0]);

exit(-1);

}

//把端口号转化成整数

short port;

if((port = atoi(argv[1]))==0){

printf("端口号有误！");

exit(-1);

}

WSADATA wsa;

//初始化套接字DLL

if(WSAStartup(MAKEWORD(2,2),&wsa)!=0){

printf("套接字初始化失败!");

exit(-1);

}

//创建套接字

SOCKET serverSocket;

if((serverSocket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==INVALID_SOCKET){

printf("创建套接字失败！");

exit(-1);

}

struct sockaddr_in serverAddress;

memset(&serverAddress,0,sizeof(sockaddr_in));

serverAddress.sin_family=AF_INET;

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

serverAddress.sin_port = htons(port);

//绑定

if(bind(serverSocket,(sockaddr*)&serverAddress,sizeof(serverAddress))==SOCKET_ERROR){

printf("套接字绑定到端口失败！端口: %d/n",port);

exit(-1);

}

//进入侦听状态

if(listen(serverSocket,SOMAXCONN)==SOCKET_ERROR){

printf("侦听失败！");

exit(-1);

}

printf("Server %d is listening....../n",port);

SOCKET clientSocket;//用来和客户端通信的套接字

struct sockaddr_in clientAddress;//用来和客户端通信的套接字地址

memset(&clientAddress,0,sizeof(clientAddress));

int addrlen = sizeof(clientAddress);

//接受连接

if((clientSocket=accept(serverSocket,(sockaddr*)&clientAddress,&addrlen))==INVALID_SOCKET){

printf("接受客户端连接失败！");

exit(-1);

}

printf("Accept connection from %s/n",inet_ntoa(clientAddress.sin_addr));

char buf[4096];

while(1){

//接收数据

int bytes;

if((bytes=recv(clientSocket,buf,sizeof(buf),0))==SOCKET_ERROR){

printf("接收数据失败!/n");

exit(-1);

}

buf[bytes]='/0';

printf("Message from %s: %s/n",inet_ntoa(clientAddress.sin_addr),buf);

if(send(clientSocket,buf,bytes,0)==SOCKET_ERROR){

printf("发送数据失败！");

exit(-1);

}

}

//清理套接字占用的资源

WSACleanup();

return 0;

}

客户端，Client.cpp



//Client.cpp

#include <winsock2.h>

#include <stdio.h>

#include <windows.h>

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

int main(int argc, char* argv[]){

//判断是否输入了IP地址和端口号

if(argc!=3){

printf("Usage: %s IPAddress PortNumber/n",argv[0]);

exit(-1);

}

//把字符串的IP地址转化为u_long

unsigned long ip;

if((ip=inet_addr(argv[1]))==INADDR_NONE){

printf("不合法的IP地址：%s",argv[1]);

exit(-1);

}

//把端口号转化成整数

short port;

if((port = atoi(argv[2]))==0){

printf("端口号有误！");

exit(-1);

}

printf("Connecting to %s:%d....../n",inet_ntoa(*(in_addr*)&ip),port);

WSADATA wsa;

//初始化套接字DLL

if(WSAStartup(MAKEWORD(2,2),&wsa)!=0){

printf("套接字初始化失败!");

exit(-1);

}

//创建套接字

SOCKET sock;

if((sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==INVALID_SOCKET){

printf("创建套接字失败！");

exit(-1);

}

struct sockaddr_in serverAddress;

memset(&serverAddress,0,sizeof(sockaddr_in));

serverAddress.sin_family=AF_INET;

serverAddress.sin_addr.S_un.S_addr = ip;

serverAddress.sin_port = htons(port);

//建立和服务器的连接

if(connect(sock,(sockaddr*)&serverAddress,sizeof(serverAddress))==SOCKET_ERROR){

printf("建立连接失败！");

exit(-1);

}

char buf[4096];

while(1){

printf(">");

//从控制台读取一行数据

gets(buf);

//发送给服务器

if(send(sock,buf,strlen(buf),0)==SOCKET_ERROR){

printf("发送数据失败！");

exit(-1);

}

int bytes;

if((bytes=recv(sock,buf,sizeof(buf),0))==SOCKET_ERROR){

printf("接收数据失败!/n");

exit(-1);

}

buf[bytes]='/0';

printf("Message from %s: %s/n",inet_ntoa(serverAddress.sin_addr),buf);

}

//清理套接字占用的资源

WSACleanup();

return 0;

}