Socket编程利用TCP协议的实验报告

Socket编程报告（TCP/IP协议）一．实验目的通过C++来实现TCP/IP协议下的Socket编程，掌握TCP协议的算法实现。

二．实验原理客户端建立Socket，通过端口号和地址确定目标服务器，使用Connect连接到服务器，send发送消息，等待处理，通信完成后调用CloseSocket关闭Socket服务端建立Socket，声明自身的端口号和地址并绑定到Socket，使用Listen打开监听，然后不断用Accept去查看是否有连接，如果有，捕获Socket，并通过Recv获取消息的内容，通信完成后调用CloseSocket关闭这个对应Accept到的Socket，如果不再需要等待任何客户端连接，那么用CloseSocket关闭掉自身的Socket三．实验代码（C++实现）服务器端代码如下：#pragma once#include <stdio.h>#include <winsock.h>#pragma comment (lib,"ws2_32.lib")class CServerNet{public://初始化服务器,返回0表示成功int Init(const char* address,int port);//更新数据void Run();private:SOCKET m_sock;};int CServerNet::Init( const char* address,int port ){int rlt = 0;//用于记录错误信息，并输出int iErrorMsg;//初始化WinSockWSAData wsaData;iErrorMsg = WSAStartup(MAKEWORD(1,1),&wsaData);if (iErrorMsg != NO_ERROR){//初始化WinSock失败printf("wsastartup failed with error : %d\n",iErrorMsg);rlt = 1;return rlt;}//创建服务端Socketm_sock = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);if (m_sock == INVALID_SOCKET){//创建Socket异常printf("socket failed with error : %d\n",WSAGetLastError()); rlt = 2;return rlt;}//声明信息sockaddr_in serverAddr;serverAddr.sin_family = AF_INET;serverAddr.sin_port = port;serverAddr.sin_addr.s_addr = inet_addr(address);//绑定iErrorMsg = bind(m_sock,(sockaddr*)&serverAddr,sizeof(serverAddr));if (iErrorMsg < 0){//绑定失败printf("bind failed with error : %d\n",iErrorMsg);rlt = 3;return rlt;}return rlt;}void CServerNet::Run(){//公开连接listen(m_sock,5);sockaddr_in tcpAddr;int len = sizeof(sockaddr);SOCKET newSocket;char buf[1024];int rval;do{//接收信息newSocket = accept(m_sock,(sockaddr*)&tcpAddr,&len);if (newSocket == INVALID_SOCKET){//非可用socket}else{//新socket连接printf("new socket connect : %d\n",newSocket);//消息处理do{printf("process\n");//接收数据memset(buf,0,sizeof(buf));rval = recv(newSocket,buf,1024,0);if (rval == SOCKET_ERROR)//这应该是个异常，当客户端没有调用closeSocket就直接退出游戏的时候，将会进入这里printf("recv socket error\n");if (rval == 0)//recv返回0表示正常退出printf("ending connection");else//显示接收到的数据printf("recv %s\n",buf);}while(rval != 0);//关闭对应Accept的socketclosesocket(newSocket);}} while (1);//关闭自身的Socketclosesocket(m_sock);}int main(int argc, char **argv){CServerNet serverNet;int iRlt = serverNet.Init("127.0.0.1",8888);if (iRlt == 0){printf("init ok...\n");serverNet.Run();}elseprintf("serverNet init failed with error : %d\n",iRlt);system("pause");}客户端代码如下：#pragma once#include <stdio.h>#include<windows.h>#pragma comment(lib, "Ws2_32.lib")class CClientNet{public://连接上指定服务器int Connect(int port,const char* address);//发送信息int SendMsg(const char* msg,int len);//关闭void Close();private:SOCKET m_sock;};int CClientNet::Connect( int port,const char* address ){int rlt = 0;//用于记录错误信息并输出int iErrMsg;//启动WinSockWSAData wsaData;iErrMsg = WSAStartup(MAKEWORD(1,1),&wsaData);if (iErrMsg != NO_ERROR)//有错误{printf("failed with wsaStartup error : %d\n",iErrMsg);rlt = 1;return rlt;}//创建Socketm_sock = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);if (m_sock == INVALID_SOCKET)//创建Socket失败{printf("socket failed with error : %d\n",WSAGetLastError());rlt = 2;return rlt;}//目标服务器数据sockaddr_in sockaddrServer;sockaddrServer.sin_family = AF_INET;sockaddrServer.sin_port = port;sockaddrServer.sin_addr.s_addr = inet_addr(address);//连接,sock与目标服务器连接iErrMsg = connect(m_sock,(sockaddr*)&sockaddrServer,sizeof(sockaddrServer));if (iErrMsg < 0){printf("connect failed with error : %d\n",iErrMsg);rlt = 3;return rlt;}return rlt;}int CClientNet::SendMsg(const char* msg,int len){int rlt = 0;int iErrMsg = 0;//发送消息，指定sock发送消息iErrMsg = send(m_sock,msg,len,0);if (iErrMsg < 0)//发送失败{printf("send msg failed with error : %d\n",iErrMsg);rlt = 1;return rlt;}return rlt;}void CClientNet::Close(){closesocket(m_sock);}int main(){CClientNet client;//连接到127.0.0.1（即本地）,端口号为8888的服务端printf("Connect\n");client.Connect(8888,"127.0.0.1");//发送消息printf("send msg\n");client.SendMsg("hello\0",sizeof("hello\0"));//关闭socketprintf("close\n");client.Close();system("pause");}四．实验结果五．心得体会通过本次实验，我了解了TCP/IP协议与UDP协议的异同之处，理解了Socket在通信中的地位和作用。

在调试程序过程中的查错纠错也让我对程序有了深刻的理解，虽然程序是借鉴他人的，但我通过调试之后的进一步解析阅读也掌握了其中的原理，收获颇丰。