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1、程序阅读范例二：套接字编程，分server和Client两部分1） server.c - 简单 TCP/UDP 套节字服务器程序 windows环境/* server.c - 简单 TCP/UDP 套节字服务器程序 windows环境 */#include #include #include #include int main(void) unsigned short port= 5001;/端口号 int socket_type = SOCK_DGRAM;/缺省使用TCP连接 char Buffer1280;/收发缓冲区 int retval, fromlen, i, isconnected
2、 = 0;/临时变量 struct sockaddr_in local, from;/套节字地址结构变量 SOCKET listen_socket, msgsock;/套节字变量 WSADATA wsaData;/windows套节字信息/先输入服务器程序所需要的基本信息：端口号，套节字类型printf(请输入端口号( 5000 ):);scanf(%d, &i);if(i 65535)printf(不正确的端口号%d,用缺省端口号5001n,i);elseport = i;printf(请输入套节字类型( 1，TCP; 2, UDP )：);scanf(%d, &i);if(i = 1)so
3、cket_type = SOCK_STREAM;else if(i = 2)socket_type = SOCK_DGRAM;elseprintf(不正确的输入%d,使用TCP数据流n,i);/在windows环境下，需要先初始化协议栈 if (retval = WSAStartup(0x202, &wsaData) != 0) printf(WSAStartup 失败，错误号：%dn, retval); WSACleanup(); return -1; /建立套节字 listen_socket = socket(AF_INET, socket_type, 0); if (listen_soc
4、ket = INVALID_SOCKET) printf(socket()失败，错误号：%dn, WSAGetLastError(); WSACleanup(); return -1; / 拷贝 解析的信息到sockaddr_in结构中 local.sin_family = AF_INET; local.sin_addr.s_addr = INADDR_ANY; local.sin_port = htons(port);/邦定网络地址到套节字 if (bind(listen_socket,(struct sockaddr*)&local, sizeof(local) ) = SOCKET_ER
5、ROR) printf(bind()失败，错误号：%dn, WSAGetLastError(); WSACleanup(); return -1; /对于流式套节字，让套节字处于监听状态，等待连接到来 if (socket_type != SOCK_DGRAM) if (listen(listen_socket,5) = SOCKET_ERROR) printf(listen()失败，错误号：%dn, WSAGetLastError(); WSACleanup(); return -1; printf(监听端口：%d, 使用协议：%sn, port,(socket_type = SOCK_ST
6、REAM)? TCP: UDP); while(1) fromlen =sizeof(from); if (socket_type = SOCK_DGRAM ) msgsock = listen_socket;else if( isconnected = 0)/对于TCP连接，如果没有连接，等待一个连接的到来 msgsock = accept(listen_socket,(struct sockaddr*)&from, &fromlen); if (msgsock = INVALID_SOCKET) printf(accept()失败，错误号：%dn,WSAGetLastError(); WS
7、ACleanup(); return -1; isconnected = 1; printf(从%s收到连接, 端口是：%dn, inet_ntoa(from.sin_addr), htons(from.sin_port); /等待接收网络信息 if (socket_type != SOCK_DGRAM) retval = recv(msgsock, Buffer, sizeof (Buffer), 0 ); /面向tcp，类似BSD read() else retval = recvfrom(msgsock, Buffer, sizeof (Buffer), 0, (struct socka
8、ddr *)&from, &fromlen);/面向UDP printf(从%s收到数据报，端口是：%dn, inet_ntoa(from.sin_addr), htons(from.sin_port); /结果判断 if (retval = SOCKET_ERROR) printf(recv()失败，错误号：%dn, WSAGetLastError(); closesocket(msgsock); continue; else if (retval = 0) printf(客户端关闭连接n); closesocket(msgsock); continue; else /正常接收printf(
9、收到 %d 字节的数据：%s n, retval, Buffer);if (socket_type != SOCK_DGRAM)/对于TCP连接，我们收到exit有一个关闭连接的操作if(!stricmp(Buffer, exit) printf(关闭TCP 连接，等待下一次连接.n);closesocket(msgsock);isconnected = 0;continue;/信息回送 printf(将同样的信息回送给客户端.nn); if (socket_type != SOCK_DGRAM) retval = send(msgsock, Buffer, strlen(Buffer)+1,
10、 0);/面向tcp，类似BSD write() else retval = sendto(msgsock, Buffer, strlen(Buffer)+1, 0, (struct sockaddr *)&from, fromlen);/面向UDP if (retval = SOCKET_ERROR) printf(send()失败，错误号：%dn, WSAGetLastError(); /程序的一个退出条件if(!stricmp(Buffer, quit)break; WSACleanup();return 0;2） client.c - 简单的 TCP/UDP 套节字客户程序 windo
11、ws环境/* client.c - 简单的 TCP/UDP 套节字客户程序 windows环境 */#include #include #include #include #include int main(void) unsigned short port = 5001;/端口号 int socket_type = SOCK_STREAM;/缺省使用TCP连接 char Buffer1280;/收发缓冲区 unsigned int addr;/IP地址变量 int retval,i;/临时变量 struct sockaddr_in server, from; /套节字地址结构变量 struct hostent *hp;/主机信息结构变量指针 WSADATA wsaData;/windows套节字信息 SOCKET conn_socket;/套节字变量/先输入客户程序所需要的基本信息：服务器地址，端口
