winSockets编程（三）最简单的C/S形式

功能：向服务器端发送一个字符串，属于最简易的形式，一共需要4个主要步骤，初始化-建立套接字-连接服务器-发送数据

/************************************************************************
*    　此代码为最简易的客户端形式,需要背诵 
*   　 作者：    Tinaluo
*    　日期：    2017/10/24
************************************************************************/

#include <WinSock2.h>
#include <iostream>
#pragma comment(lib,"ws2_32.lib")

int main()
{
    WSADATA wsd;
    if (WSAStartup(MAKEWORD(2, 2), &wsd) != 0)
    {
        std::cout << "版本不支持" << std::endl;
        return -1;
    }

    SOCKET sHost = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (INVALID_SOCKET == sHost)
    {
        std::cout << "创建套接字失败" << std::endl;
        WSACleanup();
        return -1;
    }

    SOCKADDR_IN servAddr;
    servAddr.sin_family = AF_INET;
    servAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
    servAddr.sin_port = htons(8000);
    int retVal = connect(sHost, (LPSOCKADDR)&servAddr, sizeof(servAddr));
    if (retVal == SOCKET_ERROR)
    {
        std::cout << "连接服务器失败!" << std::endl;
        closesocket(sHost);
        WSACleanup();
        return -1;
    }

    char buf[MAX_PATH];
    ZeroMemory(buf, MAX_PATH);
    strcpy_s(buf, "Connect successful!");
    retVal = send(sHost, buf, strlen(buf), 0);
    if (retVal == SOCKET_ERROR)
    {
        std::cout << "发送失败!" << std::endl;
        closesocket(sHost);
        WSACleanup();
        return -1;
    }

    std::cout << "关闭套接字!" << std::endl;
    closesocket(sHost);
    WSACleanup();
    return 0;
}

服务端

/************************************************************************
*    最简易服务器端
*    目标：接收客户端问候（此程序需要极其熟练并背诵！）
*    作者：Luotian
*    日期：2017/10/25
************************************************************************/
#include <iostream>
#include "winsock2.h"
#pragma comment(lib, "ws2_32.lib")

int main()
{    
    WSADATA wsd;
    if (WSAStartup(MAKEWORD(2, 2), &wsd) != 0)
    {
        std::cout << "初始化失败!" << std::endl;
        return -1;
    }

    SOCKET serverSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (INVALID_SOCKET == serverSocket)
    {
        std::cout << "创建套接字失败!" << std::endl;
        WSACleanup();
        return  -1;
    }

    SOCKADDR_IN addrServ;
    addrServ.sin_family = AF_INET;
    addrServ.sin_port = htons(8000);
    addrServ.sin_addr.s_addr = INADDR_ANY;
    
    int retVal = bind(serverSocket, (LPSOCKADDR)&addrServ, sizeof(SOCKADDR_IN));
    if (SOCKET_ERROR == retVal)
    {
        std::cout << " 绑定套接字失败!" << std::endl;
        closesocket(serverSocket);
        WSACleanup();
        return -1;
    }

    retVal = listen(serverSocket, 1);
    if (SOCKET_ERROR == retVal)
    {
        std::cout << "创建监听失败!" << std::endl;
        closesocket(serverSocket);
        WSACleanup();
        return -1;
    }

    sockaddr_in addrClient;
    int addrClientlen = sizeof(addrClient);
    SOCKET clientSocket = accept(serverSocket, (sockaddr FAR*)&addrClient, &addrClientlen);
    if (INVALID_SOCKET == clientSocket)
    {
        std::cout << "接受请求失败!" << std::endl;
        closesocket(serverSocket);
        WSACleanup();
        return -1;
    }

    char buf[MAX_PATH];
    ZeroMemory(buf, MAX_PATH);
    retVal = recv(clientSocket, buf, MAX_PATH, 0);
    if (SOCKET_ERROR == retVal)
    {
        std::cout << "获取数据失败!" << std::endl;
        closesocket(serverSocket);
        closesocket(clientSocket);
        WSACleanup();
        return -1;
    }
    std::cout <<buf<< std::endl;

    closesocket(serverSocket);
    closesocket(clientSocket);
    WSACleanup();
    return 0;
}