TCP部分：

参考：http://blog.csdn.net/sbfksmq/article/details/50808863

另附：linux下的tcp/udp参考：https://www.cnblogs.com/lyggqm/p/9111010.html

TCP_SEVER:

// winsocketTCPServer.cpp : 定义控制台应用程序的入口点。

//

#include "stdafx.h"

//服务器

#include<iostream>

#include<WinSock2.h>                    // socket 所需要的头文件

#pragma comment(lib,"WS2_32.lib")// link socket 库

#define PORT 9999

#define BUFLEN 1024

using namespace std;

int main()

{

    WSADATA wsaData;

    // 1 启动并初始化winsock(WSAStarup)

    if (WSAStartup(MAKEWORD(, ), &wsaData))//成功返回0

    {

        return FALSE;

    }

    //2 创建套接字(socket)

    SOCKET sServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    if (INVALID_SOCKET == sServer)

    {

        WSACleanup();

        return FALSE;

    }

    //3 准备通信地址

    SOCKADDR_IN addrServer;

    addrServer.sin_family = AF_INET;

    addrServer.sin_port = htons(PORT);

    addrServer.sin_addr.s_addr = INADDR_ANY;//任意可用地址

                                            //4 绑定地址与socket（bind）

    if (SOCKET_ERROR == bind(sServer, (const sockaddr*)&addrServer, sizeof(SOCKADDR_IN)))

    {

        closesocket(sServer);

        WSACleanup();

        return FALSE;

    }

    //5 监听 （listen)

    if (SOCKET_ERROR == listen(sServer, SOMAXCONN))

    {

        closesocket(sServer);

        WSACleanup();

    }

    // 6 等待客户端连接（accpet）

    sockaddr_in addrClient;

    int addrClientLen = sizeof(addrClient);

    cout << "服务器启动成功，等待客户端连接中。。。。" << endl;

    SOCKET sClient = accept(sServer, (sockaddr *)&addrClient, &addrClientLen);

    if (INVALID_SOCKET == sClient)

    {

        cout << WSAGetLastError() << endl;

        closesocket(sServer);

        closesocket(sClient);

        WSACleanup();

        return FALSE;

    }

    //7 接收数据（recv）

    char recvBuf[BUFLEN];

    ZeroMemory(recvBuf, sizeof(recvBuf));

    if (SOCKET_ERROR == recv(sClient, recvBuf, sizeof(recvBuf), ))

    {

        closesocket(sServer);

        closesocket(sClient);

        WSACleanup();

        return FALSE;

    }

    cout << "客户端(" << inet_ntoa(addrClient.sin_addr) << ":" << addrClient.sin_port << "):" << recvBuf << endl;

    //8 发送数据

    char sendBuf[BUFLEN] = "你好客户端！";

    if (SOCKET_ERROR == send(sClient, sendBuf, sizeof(sendBuf), ))

    {

        closesocket(sServer);

        closesocket(sClient);

        WSACleanup();

        return FALSE;

    }

    system("pause");

    system("pause");

    return TRUE;

}

/*

注：1：MAKEWORD把参数组成一个WORD（双字节）类型数据并返回这个WORD类型数值，高位代表(修订本)号,低位字节指定主版本号（其代表）

2：socket(AF_INET,//The Internet Protocol version 4 (IPv4) address family

SOCK_STREAM,//, two-way,This socket type uses the Transmission Control Protocol (TCP) for the Internet address family (AF_INET or AF_INET6).

IPPROTO_TCP//The Transmission Control Protocol (TCP). This is a possible value when the af parameter is AF_INET or AF_INET6 and the type parameter is SOCK_STREAM.

)

*/

TCP_CLIENT:

// winsocketTCPClient.cpp : 定义控制台应用程序的入口点。

//

#include "stdafx.h"

//客户端

#include<iostream>

#include<WinSock2.h>

#pragma comment(lib,"WS2_32.lib")

using namespace std;

#define BUFLEN 1024

#define PORT 9999

void getIP(char*szHostaddress);

int main()

{

    WSADATA wsaData;

    // 1 启动并初始化winsock(WSAStarup)

    if (WSAStartup(MAKEWORD(, ), &wsaData))//成功返回0

    {

        return FALSE;

    }

    //2 创建套接字(socket)

    SOCKET sHost = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    if (INVALID_SOCKET == sHost)

    {

        closesocket(sHost);

        WSACleanup();

        return FALSE;

    }

    //3 准备通信地址

    char szHostaddress[];

    getIP(szHostaddress);

    SOCKADDR_IN addrServer;

    addrServer.sin_family = AF_INET;

    addrServer.sin_port = htons(PORT);

    addrServer.sin_addr.s_addr = inet_addr(szHostaddress);

    //4 连接服务器（connect)

    if (SOCKET_ERROR == connect(sHost, (const sockaddr*)&addrServer, sizeof(addrServer)))

    {

        closesocket(sHost);

        WSACleanup();

        return FALSE;

    }

    //5 发送数据 (send)

    char sendBuf[BUFLEN] = "你好服务器!";

    if (SOCKET_ERROR == send(sHost, sendBuf, sizeof(sendBuf), ))

    {

        closesocket(sHost);

        WSACleanup();

        return FALSE;

    }

    cout << "客户端发送消息成功！" << endl;

    //7 接收数据（recv）

    char recvBuf[BUFLEN];

    ZeroMemory(recvBuf, sizeof(recvBuf));

    if (SOCKET_ERROR == recv(sHost, recvBuf, sizeof(recvBuf), ))

    {

        closesocket(sHost);

        WSACleanup();

        return FALSE;

    }

    cout << "服务器发来的消息：" << recvBuf << endl;

    system("pause");

}

void getIP(char*szHostaddress) {

    char szHostname[];

    if (gethostname(szHostname, sizeof(szHostname)) != SOCKET_ERROR)//先得到主机名

    {

        HOSTENT *pHostEnt = gethostbyname(szHostname);//通过名字拿到地址

        if (pHostEnt != NULL)

        {

            sprintf(szHostaddress, "%d.%d.%d.%d",

                (pHostEnt->h_addr_list[][] & 0x00ff),

                (pHostEnt->h_addr_list[][] & 0x00ff),

                (pHostEnt->h_addr_list[][] & 0x00ff),

                (pHostEnt->h_addr_list[][] & 0x00ff));

        }

    }

    else

        return;

}

UDP部分：

参考：http://blog.csdn.net/sbfksmq/article/details/51046439

UDP_SERVER:

// 服务端

// UDP.cpp : 定义控制台应用程序的入口点。

//1 为UDP通信，单例模式

//2 一些socket函数不兼容 预处理器定义里添加如下的宏

//_WINSOCK_DEPRECATED_NO_WARNINGS;_CRT_SECURE_NO_DEPRECATE;_SCL_SECURE_NO_DEPRECATE;

//3 UDP为非面向连接方式不需要listen 与accept

#include"stdafx.h"

#include"afxwin.h"

#include"WinSock2.h"

#include<iostream>

#include <ws2tcpip.h>

#pragma comment(lib,"WS2_32.lib")

using namespace std;

//日志 可以不看

bool WriteErrorLogFile(CString csData)// errorlog

{

    char buff[];

    CString ErrorLog;

    GetModuleFileName(NULL, (LPWSTR)buff, sizeof(buff));

    cout << buff << endl;

    ErrorLog = CString(buff);

    ErrorLog += ErrorLog.Left(ErrorLog.ReverseFind('\\')) + "\\ErrorLog";  

    CString stemp;

    CString sPathName;

    SYSTEMTIME sys_time;

    GetLocalTime(&sys_time);  

    sPathName = ErrorLog;  

    stemp.Format(L"%d%d%d", sys_time.wYear, sys_time.wMonth, sys_time.wDay);

    sPathName += "\\" + stemp;  

    CreateDirectory(sPathName, NULL);  

    CStdioFile f;

    if (!f.Open(sPathName, CStdioFile::modeCreate | CStdioFile::modeNoTruncate | CStdioFile::modeWrite | CStdioFile::typeText))

    {

        return false;

    }

    f.SeekToEnd();

    stemp.Format(L"%02d:%02d:%02d:%s\n", sys_time.wHour, sys_time.wMinute, sys_time.wSecond, csData);

    f.WriteString(stemp);

    f.Flush();

    f.Close();

    return true;

}

class UDPSERVER

{//私有

    UDPSERVER(char *ip, char*port) :m_IP(ip), m_Port(port)

    {

        m_srvSocket = INVALID_SOCKET;

        //init

    //  Init();

    }

    UDPSERVER(UDPSERVER const &that)

    {  

    }

public:

    static UDPSERVER *Instance(char*ip,char*port)

    {

        if (!_instance)

        {

            _instance = new UDPSERVER(ip, port);

        }

        return _instance;

    }

    static bool Init()

    {

        WSADATA wsaData;

        try {

            if (WSAStartup(0X202, &wsaData))//If successful, the WSAStartup function returns zero

            {

                int err = WSAGetLastError();  

                WSACleanup();

                return true;

            }

        }

        catch (...)

        {

            cout << "WSAStartup error code:" << WSAGetLastError() << endl;

            return false;

        }

        return true;

    }

    static bool GetLocalIp(char *szIP)// 获取IP

    {

        char szHostName[];

        ZeroMemory(szHostName, sizeof(szHostName));

        if (gethostname(szHostName, sizeof(szHostName))== )//gethostname 函数要在WSAStartup后进行调用。。。

        {

        //  cout << "szHostName = " <<szHostName<< endl;

            HOSTENT*pHostEnt = gethostbyname(szHostName);

            if (pHostEnt)

            {

                sprintf(szIP, "%d.%d.%d.%d", (pHostEnt->h_addr_list[][] & 0xff),

                    (pHostEnt->h_addr_list[][] & 0xff),

                    (pHostEnt->h_addr_list[][] & 0xff),

                    (pHostEnt->h_addr_list[][] & 0xff));

                //cout<<szIP<<endl;

                return true;

            }

        }

        else

        {

            cout << "gethostname error code:" << WSAGetLastError()<<endl;

            return false;

        }

        return true;

    }

    bool StartServer()

    {  

        // create socket

        m_srvSocket = socket(AF_INET, SOCK_DGRAM, );

        if (INVALID_SOCKET == m_srvSocket)

        {

            WSACleanup();

            char errBuf[];

            WriteErrorLogFile(CString(itoa(WSAGetLastError(), errBuf, sizeof(errBuf))));

            return false;

        }

        // address  

        pAddrServer.sin_family = AF_INET;

        pAddrServer.sin_port = htons(atoi(m_Port));

        pAddrServer.sin_addr.s_addr = inet_addr(m_IP);//or INADDR_ANY:接收任意IP发来的数据或指定一个IP发送数据

        //bind

        if (bind(m_srvSocket, (const sockaddr*)&pAddrServer, sizeof(SOCKADDR_IN)))

        {

            WSACleanup();

            closesocket(m_srvSocket);

            char errBuf[];

            WriteErrorLogFile(CString(itoa(WSAGetLastError(), errBuf, sizeof(errBuf))));

            return false;

        }

        //jUDP no need to listen or accept

        return true;

    }

        void RcvData(char*buff = NULL)

        {

            int nSrvAddrLen = sizeof(SOCKADDR);

            char bufMessage[];

            ZeroMemory(bufMessage, sizeof(bufMessage));

            int nRetRcv = recvfrom(m_srvSocket, bufMessage, sizeof(bufMessage), , (sockaddr*)&pAddrServer, (int *)

                &nSrvAddrLen);

            /*recv,send,(TCP)从一个已连接的socket接收或发送数据

            sendto,recvfrom(UDP/TCP)：从一个已连接或未连接的socket接收或发送数据

            当你对于数据报socket调用了connect（）函数时，你也可以利用send（）和recv（）进行数据传输，

            但该socket仍然是数据报socket，并且利用传输层的UDP服务。但在发送或接收数据报时，内核会自动为之加上目地和源地址信息。*/

            //不管是recv还是recvfrom，都有两种模式，阻塞和非阻塞，可以通过ioctl函数来设置   

            if ( == nRetRcv)

            {

                WSACleanup();

                closesocket(m_srvSocket);

                char errBuf[];

                WriteErrorLogFile(CString(itoa(WSAGetLastError(), errBuf, sizeof(errBuf))));

            }

            cout << "the client:"<<inet_ntoa(pAddrServer.sin_addr)<<" say:" << bufMessage << endl;

        }

        void SentData(char*buff=NULL)

        {

            // sendto

            SOCKADDR_IN clientAddr;

            clientAddr.sin_family = AF_INET;

            clientAddr.sin_port = htons((short));//发送到的端口

            clientAddr.sin_addr.s_addr = inet_addr(m_IP);  

            int nRetSent = sendto(m_srvSocket,"hello client",sizeof("hello client"),, (SOCKADDR*)&clientAddr, sizeof(clientAddr));

            if ( == nRetSent)

            {

                WSACleanup();

                closesocket(m_srvSocket);

                char errBuf[];

                WriteErrorLogFile(CString(itoa(WSAGetLastError(), errBuf, sizeof(errBuf))));

            }

        }

private:

    char *m_IP;

    char *m_Port;

    SOCKET m_srvSocket;

    SOCKADDR_IN  pAddrServer ;

    static UDPSERVER* _instance;

};

UDPSERVER*UDPSERVER::_instance = NULL;

int main(int argc,char*argv[])

{

    char szIP[] = {};

    UDPSERVER::Init();

    if (false != UDPSERVER::GetLocalIp(szIP))

    {

        UDPSERVER* pUdpServer = UDPSERVER::Instance(szIP, "");

        if (pUdpServer->StartServer())

        {

            while ()

            {

                pUdpServer->RcvData();

                pUdpServer->SentData();

            }

        }

        else

        {

            delete pUdpServer;

            pUdpServer = NULL;

        }

    }

    system("pause");

    return ;

}

UDP_CLIENT:

//客户端

#include "stdafx.h"

#include <winsock2.h>

#include <ws2tcpip.h>

#include <stdio.h>

#include<iostream>

#pragma comment (lib, "Ws2_32.lib")

using namespace std;

int  main(int argc, char **argv)

{

    //1 初始化

    WSADATA wsaData;

    SOCKET  sServer;

    WSAStartup(0x202, &wsaData);

    //2 创建绑定socket

    sServer = socket(AF_INET, SOCK_DGRAM, );

    SOCKADDR_IN srvAddr;

    srvAddr.sin_family = AF_INET;

    srvAddr.sin_port = htons();

    srvAddr.sin_addr.s_addr = inet_addr("172.168.28.201");

    bind(sServer, (const sockaddr*)&srvAddr, sizeof(srvAddr));

   //3 准备数据传输目的地的地址与数据

    int nSrvAddrLen = sizeof(srvAddr);

    char szSendBuff[];

    ZeroMemory(szSendBuff, sizeof(szSendBuff));

    memcpy(szSendBuff, "hello server", sizeof("hello server"));

    SOCKADDR_IN cltAddr;

    cltAddr.sin_family = AF_INET;

    cltAddr.sin_port = htons();// 发送到哪个端口            htons主机字节顺序转变成网络字节顺序

    cltAddr.sin_addr.s_addr = inet_addr("172.168.28.201");//inet_addr 字符串转换为32位二进制网络字节序的IPV4地址

    int nCltAddrLen = sizeof(cltAddr);

    // 发送

    sendto(sServer, szSendBuff, sizeof(szSendBuff), , (const sockaddr*)&cltAddr, nCltAddrLen);

    // 接收

    memset(szSendBuff, , sizeof(szSendBuff));

    recvfrom(sServer, szSendBuff, sizeof(szSendBuff), , ( sockaddr*)&srvAddr, &nSrvAddrLen);  

    /*inet_pton inetntop 可以在将IP地址在“点分十进制”和“网络二进制结构”之间转换。而且，这2个函数能够处理ipv4和ipv6。算是比较新的函数*/

    struct protoent *pe  = getprotobyname("udp");

    //getpeername(sServer, (sockaddr*)&srvAddr, &nSrvAddrLen);

    cout << "the client receive the message: " << endl;

    cout << "/* the server ip:" << inet_ntoa(srvAddr.sin_addr) << endl;//inet_ntoa 将网络地址转换成“.”点隔的字符串格式

    cout << "  the server  port is " <<ntohs(srvAddr.sin_port) << endl;//htons

    cout << "  the server protocol:" << pe->p_name << endl;

    cout << "  the server protocal num is " << pe->p_proto << endl;

    cout << "  the server message is : "<< szSendBuff << " */ " << endl;

    system("pause");

    return ;

}

SELECT部分：

参考：http://blog.csdn.net/sbfksmq/article/details/51051585

SELECT_SERVER:

// WinSelectModel.cpp : 定义控制台应用程序的入口点。

//

//server side ,select model

/*

Syntax:

int select(

_In_    int                  nfds,//Ignored. The nfds parameter is included only for compatibility with Berkeley sockets.

_Inout_ fd_set               *readfds,//An optional pointer to a set of sockets to be checked for readability.

_Inout_ fd_set               *writefds,//An optional pointer to a set of sockets to be checked for writability.

_Inout_ fd_set               *exceptfds,//An optional pointer to a set of sockets to be checked for errors.

_In_    const struct timeval *timeout//The maximum time for select to wait, provided in the form of a TIMEVAL structure. Set the timeout parameter to null for blocking operations.

)

功能：简单的讲就是一个socket“复用器”(不必为第个客户建立新线程，但需要不断轮询fd_set检测，fd_set的大小固定64)，它能够检测报告一个或多个socket状态 ，但不如WSAASyncSelct()那么细致，第次调用，select ()把一组socket作为输入参数，而且它是阻塞的（可设置）,也就是说该函数能使你同时检测多个socket的状态，它需要通过返回值来带回执行结果

Return value:成功返回当前状态与设定状态相匹配的socket的总数，超时返回0（timeout参数），失败返回SOCKET_ERROR

remarks:它与BSD兼容 ，也可以使用WSAAsyncSelect() ，timeout非零则阻塞，零则不阻塞（但不要传NULL为无限阻塞)

应用：网络连接数不大的程序

与select配合使用的宏

FD_ZERO(*set) :对fd_set初始化

FD_SET(s, *set):添加指定s套接字至集合

FD_CLR(s, *set):删除指定s套接字至集合

FD_ISSET(s, *set):检查指定s套接字是否集合

FD_SETSIZE: 64

*/

#include "stdafx.h"

#include<iostream>

#include<WinSock2.h>                    // socket 所需要的头文件

#pragma comment(lib,"WS2_32.lib")// link socket 库

#define PORT 6666

#define BUFLEN 1024

using namespace std;

fd_set g_fdClientSocket;

//fd_set

DWORD WINAPI ThreadProc(LPVOID lpParameter);

int main()

{  

    DWORD dwThreadID;

    sockaddr_in addrClient;

    int addrClientLen = sizeof(addrClient);

    SOCKET sServer = INVALID_SOCKET;

    SOCKET sClient;

    int nClientCount = ;

    // 1 启动并初始化winsock(WSAStarup)

    WSADATA wsaData;

    if (WSAStartup(0x202, &wsaData))//成功返回0

    {

        return FALSE;

    }

    //2 创建套接字(socket)

     sServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    if (INVALID_SOCKET == sServer)

    {

        WSACleanup();

        return FALSE;

    }

    //3 准备通信地址

    SOCKADDR_IN addrServer;

    addrServer.sin_family = AF_INET;

    addrServer.sin_port = htons(PORT);//服务器用于监听的端口号，客户端需要知道这个端口进行连接

    addrServer.sin_addr.s_addr =  INADDR_ANY;

    //4 绑定地址与socket（bind）

    if (SOCKET_ERROR == bind(sServer, (const sockaddr*)&addrServer, sizeof(SOCKADDR_IN)))

    {

        closesocket(sServer);

        WSACleanup();

        return FALSE;

    }

    //5 监听 （listen)

    if (SOCKET_ERROR == listen(sServer, SOMAXCONN))

    {

        closesocket(sServer);

        WSACleanup();

    }

    //6 线程利用select()处理可读的客户端

    CreateThread(NULL, , ThreadProc, NULL, , &dwThreadID);

    // 7 等待多个客户端连接（accpet）

    while (nClientCount<FD_SETSIZE)

    {

         sClient= accept(sServer, (sockaddr *)&addrClient, &addrClientLen);

        if (INVALID_SOCKET == sClient)

        {

            cout << WSAGetLastError() << endl;

            //或根据错误码进行其他操作

            closesocket(sServer);

            closesocket(sClient);

            WSACleanup();

            return FALSE;

        }

        printf("Accepted client:%s:%d\n", inet_ntoa(addrClient.sin_addr), ntohs(addrClient.sin_port));

        FD_SET(sClient,& g_fdClientSocket);

        nClientCount++;

    }

    system("pause");

    return TRUE;

}

// 只处理是可读状态的socket

DWORD WINAPI ThreadProc(LPVOID lpParameter)

{

    fd_set fdRead;

    fd_set fdWrite;

    FD_ZERO(&fdRead);

    FD_ZERO(&fdWrite);  

    int nRet = ;  

    char recvBuffer[] = {};  

    struct timeval stTimeOut = { , };  

    while (true)

    {

        fdRead = g_fdClientSocket;

        fdWrite = g_fdClientSocket;

        nRet = select(, &fdRead, &fdWrite, NULL, &stTimeOut);

        if (SOCKET_ERROR != nRet)

        {

            for (int i = ; i < g_fdClientSocket.fd_count; i++)

            {

                if (FD_ISSET(g_fdClientSocket.fd_array[i], &fdRead))

                {

                    memset(recvBuffer, , sizeof(recvBuffer));

                    SOCKADDR_IN stAddrTemp;

                    int nTempLen = sizeof(stAddrTemp);

                    nRet = recvfrom(g_fdClientSocket.fd_array[i], recvBuffer, sizeof(recvBuffer), , (sockaddr*)&stAddrTemp, &nTempLen);

                    if (SOCKET_ERROR == nRet)

                    {

                        closesocket(g_fdClientSocket.fd_array[i]);

                        FD_CLR(g_fdClientSocket.fd_array[i], &g_fdClientSocket);

                    }

                    else

                    {

                        cout << "the client(" << inet_ntoa(stAddrTemp.sin_addr) << ":" << ntohs(stAddrTemp.sin_port) << ") :" << recvBuffer << "(message size is " << nTempLen << ")" << endl;

                    }

                }

                if (FD_ISSET(g_fdClientSocket.fd_array[i], &fdWrite))

                {

                    nRet = send(g_fdClientSocket.fd_array[i], "hello Client", sizeof("hello Client"), );

                    if (SOCKET_ERROR == nRet)

                    {

                        int nErrorNo = WSAGetLastError();

                        cout << "send error code is " << nErrorNo << endl;//10038  socket handle parameter did not reference a valid socket, or for select, a member of an fd_set was not valid.

                        closesocket(g_fdClientSocket.fd_array[i]);

                        FD_CLR(g_fdClientSocket.fd_array[i], &g_fdClientSocket);

                    }

                    else

                    {

                        continue;

                    }

                }

            }

        }

    }

}

SELECT_CLIENT:

// WinSelectClient.cpp : 定义控制台应用程序的入口点。

//  

#include "stdafx.h"

#include<WinSock2.h>

//客户端

#include<iostream>

#pragma comment(lib,"WS2_32.lib")

using namespace std;

#define BUFLEN 1024

#define PORT 6666

void getIP(char*szHostaddress);

void SendProc();

SOCKET sHost;

int main()

{

    WSADATA wsaData;

    // 1 启动并初始化winsock(WSAStarup)

    if (WSAStartup(MAKEWORD(, ), &wsaData))//成功返回0

    {

        return FALSE;

    }

    //2 创建套接字(socket)

    sHost = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    if (INVALID_SOCKET == sHost)

    {

        closesocket(sHost);

        WSACleanup();

        return FALSE;

    }

    //3 准备通信地址

    char szHostaddress[];

    getIP(szHostaddress);

    SOCKADDR_IN addrServer;

    addrServer.sin_family = AF_INET;

    addrServer.sin_port = htons(PORT);

    addrServer.sin_addr.s_addr = inet_addr(szHostaddress);

    //4 连接服务器（connect)

    if (SOCKET_ERROR == connect(sHost, (const sockaddr*)&addrServer, sizeof(addrServer)))//连接到指定的地址

    {

        closesocket(sHost);

        WSACleanup();

        return FALSE;

    }

    //5 发送数据 (send)

    char sendBuf[BUFLEN] = "你好服务器!";

    if (SOCKET_ERROR == send(sHost, sendBuf, sizeof(sendBuf), ))

    {

        closesocket(sHost);

        WSACleanup();

        return FALSE;

    }

    cout << "客户端发送消息成功！" << endl;

    //7 接收数据（recv）

    char recvBuf[BUFLEN];

    ZeroMemory(recvBuf, sizeof(recvBuf));

    if (SOCKET_ERROR == recv(sHost, recvBuf, sizeof(recvBuf), ))

    {

        closesocket(sHost);

        WSACleanup();

        return FALSE;

    }

    cout << "服务器发来的消息：" << recvBuf << endl;

    while (true)

    {

        SendProc();

        Sleep();

    }

    system("pause");

}

void SendProc(

    )

{

    char sendBuf[BUFLEN] = "你好服务器!";

    if (SOCKET_ERROR == send(sHost, sendBuf, sizeof(sendBuf), ))

    {

        closesocket(sHost);

        WSACleanup();

        return ;

    }

    cout << "客户端发送消息成功！" << endl;

}  

void getIP(char*szHostaddress) {

    char szHostname[];

    if (gethostname(szHostname, sizeof(szHostname)) != SOCKET_ERROR)//先得到主机名

    {

        HOSTENT *pHostEnt = gethostbyname(szHostname);//通过名字拿到地址

        if (pHostEnt != NULL)

        {

            sprintf(szHostaddress, "%d.%d.%d.%d",

                (pHostEnt->h_addr_list[][] & 0x00ff),

                (pHostEnt->h_addr_list[][] & 0x00ff),

                (pHostEnt->h_addr_list[][] & 0x00ff),

                (pHostEnt->h_addr_list[][] & 0x00ff));

        }

    }

    else

        return;

}

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