windows 下socket 实现服务器和客户端连接的小例子
// 服务器端实现代码#include <WinSock.h>#include <iostream>using namespace std;#define MAX_NAMEBUF 255#define MAX_BUF1024// 网络链接库#pragma comment( lib , "ws2_32.lib")void socketInit2(){// Windows异步套接字)的启动命令WSADATA wsaData;if (WSAStartup(MAKEWORD(2,1),&wsaData)) //调用Windows Sockets DLL{ printf("Winsock无法初始化!\n");WSACleanup();return;}int sockfd,new_fd;struct sockaddr_in my_addr;struct sockaddr_in their_addr;int sin_size;//建立TCP套接口if((sockfd = socket(AF_INET,SOCK_STREAM,0))==-1){printf("create socket error\n");perror("socket");exit(1);}//初始化结构体，并绑定2323端口my_addr.sin_family = AF_INET;my_addr.sin_port = htons(2323);my_addr.sin_addr.s_addr = INADDR_ANY;memset(my_addr.sin_zero, 0, 8);//绑定套接口if(bind(sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr))==-1){perror("bind socket error");exit(1);}//创建监听套接口if(listen(sockfd,10)==-1){perror("listen");exit(1);}//等待连接while(1){sin_size = sizeof(struct sockaddr_in);printf("server is run.\n");//如果建立连接，将产生一个全新的套接字if((new_fd = accept(sockfd,(struct sockaddr *)&their_addr,&sin_size))==-1){perror("accept");exit(1);}printf("accept success.\n");//读取客户端发来的信息int numbytes;char buff[256];memset(buff,0,256);if((numbytes = recv(new_fd,buff,sizeof(buff),0))==-1){perror("recv");exit(1);}printf("%s\n",buff);//将从客户端接收到的信息再发回客户端if(send(new_fd,buff,strlen(buff),0)==-1){perror("send");closesocket(new_fd);exit(0);}closesocket(new_fd);}closesocket(sockfd);}int _tmain(int argc, _TCHAR* argv[]){socketInit2();return 0;}// 客户端实现代码#include <stdio.h>#include <stdlib.h>#include <string.h>#include <sys/types.h>#include <WinSock2.h>#include <iostream>// 网络链接库#pragma comment( lib , "ws2_32.lib")int main(int argc,char *argv[]){// Windows异步套接字)的启动命令WSADATA wsaData;if (WSAStartup(MAKEWORD(2,1),&wsaData)) //调用Windows Sockets DLL{ printf("Winsock无法初始化!\n");WSACleanup();return 0;}int sockfd,numbytes;char buf[100];struct sockaddr_in their_addr;//建立一个TCP套接口if((sockfd = socket(AF_INET,SOCK_STREAM,0))==-1){perror("socket");printf("create socket error.建立一个TCP套接口失败");exit(1);}//初始化结构体，连接到服务器的2323端口their_addr.sin_family = AF_INET;their_addr.sin_port = htons(2323);hostent*pEnt;char hostname[256];::gethostname(hostname, sizeof(hostname));if ((pEnt = ::gethostbyname(hostname)) != NULL){ULONG ad = *(ULONG *)pEnt->h_addr_list[0];their_addr.sin_addr.s_addr = ad;std::cout<<ad<<std::endl;}memset(their_addr.sin_zero,0,8);//和服务器建立连接if(connect(sockfd,(struct sockaddr *)&their_addr,sizeof(struct sockaddr))==-1){perror("connect");exit(1);}//向服务器发送数据if(send(sockfd,"hello!socket.",16,0)==-1){perror("send");exit(1);}//接受从服务器返回的信息if((numbytes = recv(sockfd,buf,100,0))==-1){perror("recv");exit(1);}buf[numbytes] = '\0';printf("Recive from server:%s\n",buf);//关闭socketclosesocket(sockfd);getchar();}