基于TCP协议时间服务器程序设计.doc

基于TCP协议时间服务器程序设 实验题目：基于TCP协议时间服务器程序设计实验目的：了解TCP通讯的过程，更进一步掌握TCP协议的有关知识。掌握WINDOWS系统下网络通信基本接口使用；掌握网络通信中基本的程序模式；了解PING命令功能；了解时间服务实现方法。实验内容：1、 使用VC开发环境，编写服务器程序，程序如下ret=send(sock,&reBuffidx,nLeft,0);if(ret=0)break;else if(ret=SOCKET_ERROR)printf(send()failed:%dn,WSAGetLastError();break;printf(示范例子发送到终端:%sn,szBuff);nLeft-=ret;idx+=ret;printf(.n);return 0; /Function:main/Description:/Main thread of execution.Initialize Winsock,parse the/command line arguments,creat the listening socket,bind/to the local addres,and wait for client cinnections./int main(int argc, char* argv)WSADATA wsd;SOCKET sListen,sClient;int iAddrSize;HANDLE hThread;DWORD dwThreadId;struct sockaddr_in local,client;ValidateArgs(argc,argv);if(WSAStartup(MAKEWORD(2,2),&wsd)!=0)printf(Failed to load Winsock!n);return 1;/Create our listening socket/sListen=socket(AF_INET,SOCK_STREAM,IPPROTO_IP);if(sListen=SOCKET_ERROR)printf(socket() failed:%dn,WSAGetLastError();return 1;/Select the local interface and bind to it/if(bInterface)local.sin_addr.s_addr=inet_addr(szAddress);if(local.sin_addr.s_addr=INADDR_NONE)usage();elselocal.sin_addr.s_addr=htonl(INADDR_ANY);local.sin_family=AF_INET;local.sin_port=htons(iPort);if(bind(sListen,(struct sockaddr*)&local,sizeof(local)=SOCKET_ERROR)printf(bind() failed:%dn,WSAGetLastError();return 1;listen(sListen,5);/In a continous loop,wait for incoming clients.Once one/is detected,create a thread and pass the handle off to it/printf(示范例子服务已启动，端口：7803n);while(1)iAddrSize=sizeof(client);sClient=accept(sListen,(struct sockaddr*)&client,&iAddrSize);if(sClient=INVALID_SOCKET)printf(accept()failed:%dn,WSAGetLastError();break;printf(示范例子Accepted client:%s:%dn, inet_ntoa(client.sin_addr),ntohs(client.sin_port);hThread=CreateThread(NULL,0,ClientThread, (LPVOID)sClient,0,&dwThreadId);if(hThread=NULL)printf(CreateThread()failed:%dn,GetLastError();break;CloseHandle(hThread);closesocket(sListen);WSACleanup();return 0;2、实验程序所要实现的功能1、加载套接字库，创建套接字(WSAStartup()/socket();2、绑定套接字到一个IP地址和一个端口上(bind()；3、将套接字设置为监听模式等待连接请求(listen()；4、请求到来后，接受连接请求，返回一个新的对应于此次连接的套接字(accept()；5、用返回的套接字和客户端进行通信(send()/recv()；6、返回，等待另一连接请求；7、关闭套接字，关闭加载的套接字库(closesocket()/WSAScleanup()。3、实现程序功能所需要的函数1 WSAStartup()/socket()功能：加载套接字库/创建一个新的套接字格式：int WSAStartt(WORD wVersionRequest,LPWSADATA loWSAData);SOCKET socket(int af,int type,int procotol);2 bind()功能：将指定的套接字同一个已知地址绑定到一起。格式：int bind(SOCKET s,const struct sockaddr FAR * name,int namelen);3 listen()功能：用于面向连接服务器，表明它愿意接收连接。格式：int listen(SOCKET s, int backlog);4 accept()功能：建立连接格式：SOCKET accept(SOCKET s,struct sockaddr FAR * name,int FAR * addrlen);5 send()/recv()功能：在已经连接的套接字上发送/接受数据格式：int send(SOCKET s,char FAR* buf,int len,int flags); int recv(SOCKET s,char FAR* buf,int len,int flags);6 closesocket()/WSAScleanup()功能：关闭套接字格式：int closesocket(SOCKET s