socket tcp 服务端 ,客户端

 

 

 

 

 

 

 

 

 

tcp_server.cpp

#include <WinSock2.h>
#include <iostream>





using namespace std;

//指定动态库的lib文件
#pragma comment(lib,"ws2_32.lib")

int main() {

    //初始化winsock2.2 相关的动态库
    WSADATA wd;
    if (WSAStartup(MAKEWORD(2, 2), &wd) != 0) {
        //0表示成功
        cout << "WSAStartup error:" << WSAGetLastError() << endl;
        return 0;
    }

    //1,创建tcp socket 流式套接字
    SOCKET s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (s == INVALID_SOCKET) {

        cout << "socket error:" << WSAGetLastError() << endl;
        return 0;
    }

    //2,绑定socket 到一个 ip地址和端口
    sockaddr_in addr;
    //网络字节序
    addr.sin_port = htons(8000);
    addr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
    addr.sin_family = AF_INET; //地址族
    int len = sizeof(sockaddr_in);
    if (bind(s, (sockaddr*)&addr, len) == SOCKET_ERROR) {
        cout << "bind error:" << WSAGetLastError() << endl;
        return 0;

    }
    //3,监听
    //5代表正在等待完成相应的tcp三次握手过程的队列长度
    if (listen(s, 5) == SOCKET_ERROR) {
        cout << "listen error:" << WSAGetLastError() << endl;
        return 0;

    }

    //4,接受客户端请求,并且返回和客户端通讯的套接字
    sockaddr_in addrClient;
    memset(&addrClient, 0, sizeof(sockaddr_in));
    len = sizeof(sockaddr_in);
    SOCKET c = accept(s, (sockaddr*)&addrClient, &len);
    //成功返回套接字
    if (c == INVALID_SOCKET) {
        cout << "accept error:" << WSAGetLastError() << endl;
        return 0;
    }


    //5,发送,接受消息
    int ret = 0;

    do {
        //向客户端发送数据, 用accept 返回的套接字c
        ret = send(c, "i am server!", strlen("i am server!"), 0);
        //接收客户端的消息
        char buf[64] = { '\0' };
        //把flag 置为0
        ret = recv(c, buf, 64, 0);

        cout << "recv:"<<inet_ntoa(addrClient.sin_addr) <<":  " << buf << endl;
    } while (ret != SOCKET_ERROR && ret != 0);
    //对方关闭返回0, 错误是error


    //6 关闭
    closesocket(s);

    //清理winsock环境
    WSACleanup();



    //netstat -ao

    return 0;
}

 

 

 

tcp_client.cpp

#include <WinSock2.h>
#include <iostream>





using namespace std;

//指定动态库的lib文件
#pragma comment(lib,"ws2_32.lib")

int main() {


    //初始化winsock2.2 相关的动态库
    WSADATA wd;
    if (WSAStartup(MAKEWORD(2, 2), &wd) != 0) {
        //0表示成功
        cout << "WSAStartup error:" << WSAGetLastError() << endl;
        return 0;
    }


    //1,创建tcp socket 流式套接字
    SOCKET s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (s == INVALID_SOCKET) {

        cout << "socket error:" << WSAGetLastError() << endl;
        return 0;
    }

    //2,链接服务端
    sockaddr_in addr;
    //网络字节序
    addr.sin_port = htons(8000);
    addr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
    addr.sin_family = AF_INET; //地址族
    int len = sizeof(sockaddr_in);

    if (connect(s, (sockaddr*)&addr, len) == SOCKET_ERROR) {
    
        cout << "connect error:" << WSAGetLastError() << endl;
        return 0;
    }

    //3接受发送消息
    int ret = 0;

    do {
        char buf[64] = {'\0'};
        ret = recv(s,buf,64,0);

        cout << "recv:" << inet_ntoa(addr.sin_addr) << ":  " << buf << endl;

        //send
        ret = send(s,"i am client!",strlen("i am client!"),0);

        Sleep(1000);
    } while (ret != SOCKET_ERROR && ret != 0);




    //清理winsock环境
    WSACleanup();



    //netstat -ao

    return 0;
}