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(, ), &wsd) != )

    {

        std::cout << "版本不支持" << std::endl;

        return -;

    }

    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 -;

    }

    SOCKADDR_IN servAddr;

    servAddr.sin_family = AF_INET;

    servAddr.sin_addr.s_addr = inet_addr("127.0.0.1");

    servAddr.sin_port = htons();

    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 -;

    }

    char buf[MAX_PATH];

    ZeroMemory(buf, MAX_PATH);

    strcpy_s(buf, "Connect successful!");

    retVal = send(sHost, buf, strlen(buf), );

    if (retVal == SOCKET_ERROR)

    {

        std::cout << "发送失败!" << std::endl;

        closesocket(sHost);

        WSACleanup();

        return -;

    }

    std::cout << "关闭套接字!" << std::endl;

    closesocket(sHost);

    WSACleanup();

    return ;

}

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(, ), &wsd) != )

    {

        std::cout << "初始化失败!" << std::endl;

        return -;

    }

    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  -;

    }

    SOCKADDR_IN addrServ;

    addrServ.sin_family = AF_INET;

    addrServ.sin_port = htons();

    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 -;

    }

    retVal = listen(serverSocket, );

    if (SOCKET_ERROR == retVal)

    {

        std::cout << "创建监听失败!" << std::endl;

        closesocket(serverSocket);

        WSACleanup();

        return -;

    }

    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 -;

    }

    char buf[MAX_PATH];

    ZeroMemory(buf, MAX_PATH);

    retVal = recv(clientSocket, buf, MAX_PATH, );

    if (SOCKET_ERROR == retVal)

    {

        std::cout << "获取数据失败!" << std::endl;

        closesocket(serverSocket);

        closesocket(clientSocket);

        WSACleanup();

        return -;

    }

    std::cout <<buf<< std::endl;

    closesocket(serverSocket);

    closesocket(clientSocket);

    WSACleanup();

    return ;

}