c++ 網絡編程（一）TCP/IP 入門級客戶端與服務端交互代碼

原文作者：aircraft

原文地址：https://www.cnblogs.com/DOMLX/p/9601511.html

　　　　c++ 網絡編程（一）TCP/IP  入門級客戶端與服務端交互代碼

測試環境：VS2013

一.服務端代碼

#define _WINSOCK_DEPRECATED_NO_WARNINGS

#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;
    }

    //創建用於監聽的套接字
    SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0);

    SOCKADDR_IN addrSrv;
    addrSrv.sin_family = AF_INET;
    addrSrv.sin_port = htons(port); //1024以上的端口號
    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)
    {
        //等待客戶請求到來    
        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));

        //發送數據
        int iSend = send(sockConn, buf, sizeof(buf), 0);
        if (iSend == SOCKET_ERROR){
            printf("send failed");
            break;
        }

        char recvBuf[100];
        memset(recvBuf, 0, sizeof(recvBuf));
        //         //接收數據
        recv(sockConn, recvBuf, sizeof(recvBuf), 0);
        printf("%s\n", recvBuf);

        closesocket(sockConn);
    }

    closesocket(sockSrv);
    WSACleanup();
    system("pause");
}

二.客戶端代碼

#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include <WinSock2.h>
#include <stdio.h>

#pragma comment(lib, "ws2_32.lib")

void main()
{
    //加載套接字
    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");

    //創建套接字
    SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0);
    if (SOCKET_ERROR == sockClient){
        printf("Socket() error:%d", WSAGetLastError());
        return;
    }

    //向服務器發出連接請求
    if (connect(sockClient, (struct  sockaddr*)&addrSrv, sizeof(addrSrv)) == INVALID_SOCKET){
        printf("Connect failed:%d", WSAGetLastError());
        return;
    }
    else
    {
        //接收數據
        recv(sockClient, buff, sizeof(buff), 0);
        printf("%s\n", buff);
    }

    //發送數據
    char *buffSend = "hello, this is a Client....";
    send(sockClient, buffSend, strlen(buffSend) + 1, 0);
    printf("%d", strlen(buffSend) + 1);

    //關閉套接字
    closesocket(sockClient);
    WSACleanup();
    system("pause");
}

怕某些小白不懂我詳細說說運行，運行時先開服務端，在開客戶端運行 ，也就是開兩個cPP文件分別運行，兩個cpp各是一個小項目代碼 不要放在一起

這裏的127.0.0.1是代表本地的地址，你們想實現兩機交互就用對方的地址。

代碼很簡單，想要直接拿去，接下來直接看運行結果：