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，考试.大提示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
