C++网络编程

#include "stdafx.h"
#include "winsock2.h"
#include <iostream>
#pragma comment(lib, "ws2_32.lib")

using namespace std;
BOOL RecvLine(SOCKET s, char* buf); //读取一行数据

int main(int argc, char* argv[])
{
const int BUF_SIZE = 64;

WSADATA wsd; //WSADATA变量
SOCKET sHost; //服务器套接字
SOCKADDR_IN servAddr; //服务器地址
char buf[BUF_SIZE]; //接收数据缓冲区
char bufRecv[BUF_SIZE];
int retVal; //返回值
//初始化套结字动态库
if (WSAStartup(MAKEWORD(2, 2), &wsd) != 0)
{
cout << "WSAStartup failed!" << endl;
return -1;
}
//创建套接字
sHost = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (INVALID_SOCKET == sHost)
{
cout << "socket failed!" << endl;
WSACleanup();//释放套接字资源
return  -1;
}

//设置服务器地址
servAddr.sin_family = AF_INET;
servAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
servAddr.sin_port = htons((short)4999);
int nServAddlen = sizeof(servAddr);

//连接服务器
retVal = connect(sHost, (LPSOCKADDR)&servAddr, sizeof(servAddr));
if (SOCKET_ERROR == retVal)
{
cout << "connect failed!" << endl;
closesocket(sHost); //关闭套接字
WSACleanup(); //释放套接字资源
return -1;
}
while (true)
{
//向服务器发送数据
ZeroMemory(buf, BUF_SIZE);
cout << "向服务器发送数据:";
cin >> buf;
retVal = send(sHost, buf, strlen(buf), 0);
if (SOCKET_ERROR == retVal)
{
cout << "send failed!" << endl;
closesocket(sHost); //关闭套接字
WSACleanup(); //释放套接字资源
return -1;
}
//RecvLine(sHost, bufRecv);
ZeroMemory(bufRecv, BUF_SIZE);
recv(sHost, bufRecv, BUF_SIZE, 0); // 接收服务器端的数据， 只接收5个字符
cout << endl << "从服务器接收数据:" << bufRecv;
cout << "\n";
}
//退出
closesocket(sHost); //关闭套接字
WSACleanup(); //释放套接字资源
return 0;
}

服务器代码：

// Server.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "winsock2.h"
#pragma comment(lib, "ws2_32.lib")
#include<iostream>
using namespace std;
int main(int argc, char* argv[])
{
const int BUF_SIZE = 64;
WSADATA         wsd;            //WSADATA变量
SOCKET          sServer;        //服务器套接字
SOCKET          sClient;        //客户端套接字
SOCKADDR_IN     addrServ;;      //服务器地址
char            buf[BUF_SIZE];  //接收数据缓冲区
char            sendBuf[BUF_SIZE];//返回给客户端得数据
int             retVal;         //返回值
//初始化套结字动态库
if (WSAStartup(MAKEWORD(2, 2), &wsd) != 0)
{
cout << "WSAStartup failed!" << endl;
return 1;
}

//创建套接字
sServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (INVALID_SOCKET == sServer)
{
cout << "socket failed!" << endl;
WSACleanup();//释放套接字资源;
return  -1;
}

//服务器套接字地址
addrServ.sin_family = AF_INET;
addrServ.sin_port = htons(4999);
addrServ.sin_addr.s_addr = INADDR_ANY;
//绑定套接字
retVal = bind(sServer, (LPSOCKADDR)&addrServ, sizeof(SOCKADDR_IN));
if (SOCKET_ERROR == retVal)
{
cout << "bind failed!" << endl;
closesocket(sServer);   //关闭套接字
WSACleanup();           //释放套接字资源;
return -1;
}

while (1)
{
//开始监听
retVal = listen(sServer, 10);
if (SOCKET_ERROR == retVal)
{
cout << "listen failed!" << endl;
closesocket(sServer);   //关闭套接字
WSACleanup();           //释放套接字资源;
return -1;
}

//接受客户端请求
sockaddr_in addrClient;
int addrClientlen = sizeof(addrClient);
sClient = accept(sServer, (sockaddr FAR*)&addrClient, &addrClientlen);
if (INVALID_SOCKET == sClient)
{
cout << "accept failed!" << endl;
closesocket(sServer);   //关闭套接字
WSACleanup();           //释放套接字资源;
return -1;
}

while (1)
{
//接收客户端数据
ZeroMemory(buf, BUF_SIZE);
retVal = recv(sClient, buf, BUF_SIZE, 0);
if (SOCKET_ERROR == retVal)
{
cout << "recv failed!" << endl;
closesocket(sServer);   //关闭套接字
closesocket(sClient);   //关闭套接字
WSACleanup();           //释放套接字资源;
return -1;
}
if (buf[0] == '0')
//break;
cout << "客户端发送的数据: " << buf << endl;

cout << "向客户端发送数据: ";
cin >> sendBuf;

send(sClient, sendBuf, strlen(sendBuf), 0);
}
}

//退出
closesocket(sServer);   //关闭套接字
closesocket(sClient);   //关闭套接字
WSACleanup();           //释放套接字资源;
return 0;
}