client

客户端

#include<Winsock2.h>
#include<stdio.h>
#include<stdlib.h>
#pragma comment (lib,"ws2_32.lib")

//服务器使用的端口号为5050
#define DEFAULT_PORT 5050
#define DATA_BUFFER 1024

void main()
{
    WSADATA wsaData;
    SOCKET sClient;
    int iPort = DEFAULT_PORT;
    //接收数据的缓冲
    int iSend;
    int iRecv;
    //要发送给服务器的信息
    char send_buf[1024];
    //接收数据的缓冲
    char recv_buf[DATA_BUFFER];
    //服务器端地址
    struct sockaddr_in ser;

    printf("--------------------------\n");
    printf("基于TCP的通信程序的客户端\n");

    //提示在命令持中输入法服务器IP地址
    printf("输入服务器IP：");

    char ipz[32];    
    gets(ipz);
    //char * ipz=&ip;

    //接收数据的缓冲区初始化
    memset(recv_buf,0,sizeof(recv_buf));

    if(WSAStartup(MAKEWORD(2,2),&wsaData) != 0)
    {
        printf("Failed to load Winsock.\n");
        return;
    }

    //填写要连接的服务器地址信息
    ser.sin_family = AF_INET;
    ser.sin_port = htons(iPort);
    //inet_addr()函数将命令持的点扫IP地址转化为用二进制表示的网络顺序的IP地址
    //ser.sin_addr.s_addr = inet_addr(argv[1]);
    ser.sin_addr.s_addr = inet_addr(ipz);
    //建立客户端流式套接口
    sClient = socket(AF_INET,SOCK_STREAM,0);

    if(sClient == INVALID_SOCKET)
    {
        printf("socket() Failed:%d\n",WSAGetLastError());
        return;
    }

    //请求与服务器端建立TCP连接
    if(connect(sClient,(struct sockaddr*)&ser,sizeof(ser)) == INVALID_SOCKET)
    {
        printf("connect() Failed.:%d\n",WSAGetLastError());
        return;
    }
    else
    {
        printf("建立TCP连接成功!\n");
        printf("--------------------------\n");

        //进入一个无限循环，与服务器交互
        while(1){

            //向服务器发送数据

            printf("发送消息:");
            gets(send_buf);

            iSend = send(sClient,send_buf,sizeof(send_buf),0);

            if(iSend == SOCKET_ERROR)
            {
                printf("send() Failed:%d\n,WSAGetLastError()");
                    return;
            }
            else if(iSend == 0)
                return;
                else
                    printf("发送成功.\n");


            //从服务器端接收数据
            iRecv = recv(sClient,recv_buf,sizeof(recv_buf),0);

            if(iRecv == SOCKET_ERROR)
            {
                printf("recv() Failed:%d\n",WSAGetLastError());
                return;
            }
            else if(iRecv == 0)
                return;
                else
                {
                    //显示从服务器收到的信息
                    printf("服务器说:%s\n",recv_buf);
                    printf("--------------------------\n");
                }
        }
    }

    closesocket(sClient);
    WSACleanup();
}