客户端服务器程序

//服务器端
#include <WinSock2.h>  
#include <stdio.h>  
#include <stdlib.h>  
  
#pragma comment(lib, "ws2_32.lib")  
  
void main()  
{  
    WSADATA wsaData;  
    int port = 5099;  
  
    char buf[] = "Server: hello, I am a server.....";   
  
    if(WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)  
    {  
        printf("Failed to load Winsock");  
        return;  
    }  
  
    //创建用于监听的套接字  
    SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0);  
  
    SOCKADDR_IN addrSrv;  
    addrSrv.sin_family = AF_INET;  
    addrSrv.sin_port = htons(port); //1024以上的端口号  
    addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);  
  
    int retVal = bind(sockSrv, (LPSOCKADDR)&addrSrv, sizeof(SOCKADDR_IN));  
    if(retVal == SOCKET_ERROR){  
        printf("Failed bind:%d\n", WSAGetLastError());  
        return;  
    }  
  
    if(listen(sockSrv,10) ==SOCKET_ERROR){  
        printf("Listen failed:%d", WSAGetLastError());  
        return;  
    }  
  
    SOCKADDR_IN addrClient;  
    int len = sizeof(SOCKADDR);  
  
    while(1)  
    {  
        //等待客户请求到来    
        SOCKET sockConn = accept(sockSrv, (SOCKADDR *) &addrClient, &len);  
        if(sockConn == SOCKET_ERROR){  
            printf("Accept failed:%d", WSAGetLastError());  
            break;  
        }  
  
        printf("Accept client IP:[%s]\n", inet_ntoa(addrClient.sin_addr));  
  
        //发送数据  
        int iSend = send(sockConn, buf, sizeof(buf) , 0);  
        if(iSend == SOCKET_ERROR){  
            printf("send failed");  
            break;  
        }  
  
        char recvBuf[100];  
        memset(recvBuf, 0, sizeof(recvBuf));  
//      //接收数据  
        recv(sockConn, recvBuf, sizeof(recvBuf), 0);  
        printf("%s\n", recvBuf);  
  
        closesocket(sockConn);  
    }  
  
    closesocket(sockSrv);  
    WSACleanup();  
    system("pause");  
}  

//客户端

#include <WinSock2.h>  
#include <stdio.h>  
  
#pragma comment(lib, "ws2_32.lib")  
  
void main()  
{  
    //加载套接字  
    WSADATA wsaData;  
    char buff[1024];  
    memset(buff, 0, sizeof(buff));  
  
    if(WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)  
    {  
        printf("Failed to load Winsock");  
        return;  
    }  
  
    SOCKADDR_IN addrSrv;  
    addrSrv.sin_family = AF_INET;  
    addrSrv.sin_port = htons(5099);  
    addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");  
  
    //创建套接字  
    SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0);  
    if(SOCKET_ERROR == sockClient){  
        printf("Socket() error:%d", WSAGetLastError());  
        return;  
    }  
  
    //向服务器发出连接请求  
    if(connect(sockClient, (struct  sockaddr*)&addrSrv, sizeof(addrSrv)) == INVALID_SOCKET){  
        printf("Connect failed:%d", WSAGetLastError());  
        return;  
    }else  
    {  
        //接收数据  
        recv(sockClient, buff, sizeof(buff), 0);  
        printf("%s\n", buff);  
    }  
  
    //发送数据  
    char buff = "hello, this is a Client....";  
    send(sockClient, buff, sizeof(buff), 0);  
  
    //关闭套接字  
    closesocket(sockClient);  
    WSACleanup();  
}