网络的Socket数据传输.docx

1.网络的Socket数据传输是一种特殊的I/O，Socket也是一种文件描述符。Socket也具有一个类似于打开文件的函数调用Socket()，该函数返回一个整型的Socket描述符，随后的连接建立、数据传输等操作都是通过该Socket实现的。2.3.下面用Socket实现一个windows下的c语言socket通信例子，这里我们客户端传递一个字符串，服务器端进行接收。4.1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991001011021031041051061071081091101111121131141151161171181191201211221231241251261271281291301311321331341351361371381391401411421431441451461471481491501511521531541556157158159【服务器端】#includestdafx.h#include#include#include#defineSERVER_PORT5208/侦听端口voidmain()WORDwVersionRequested;WSADATAwsaData;intret,nLeft,length;SOCKETsListen,sServer;/侦听套接字，连接套接字structsockaddr_insaServer,saClient;/地址信息char*ptr;/用于遍历信息的指针/WinSock初始化wVersionRequested=MAKEWORD(2,2);/希望使用的WinSockDLL的版本ret=WSAStartup(wVersionRequested,&wsaData);if(ret!=0)printf(WSAStartup()failed!n);return;/创建Socket,使用TCP协议sListen=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);if(sListen=INVALID_SOCKET)WSACleanup();printf(socket()faild!n);return;/构建本地地址信息saServer.sin_family=AF_INET;/地址家族saServer.sin_port=htons(SERVER_PORT);/注意转化为网络字节序saServer.sin_addr.S_un.S_addr=htonl(INADDR_ANY);/使用INADDR_ANY指示任意地址/绑定ret=bind(sListen,(structsockaddr*)&saServer,sizeof(saServer);if(ret=SOCKET_ERROR)printf(bind()faild!code:%dn,WSAGetLastError();closesocket(sListen);/关闭套接字WSACleanup();return;/侦听连接请求ret=listen(sListen,5);if(ret=SOCKET_ERROR)printf(listen()faild!code:%dn,WSAGetLastError();closesocket(sListen);/关闭套接字return;printf(Waitingforclientconnecting!n);printf(Tips:Ctrl+ctoquit!n);/阻塞等待接受客户端连接while(1)/循环监听客户端，永远不停止，所以，在本项目中，我们没有心跳包。length=sizeof(saClient);sServer=accept(sListen,(structsockaddr*)&saClient,&length);if(sServer=INVALID_SOCKET)printf(accept()faild!code:%dn,WSAGetLastError();closesocket(sListen);/关闭套接字WSACleanup();return;charreceiveMessage5000;nLeft=sizeof(receiveMessage);ptr=(char*)&receiveMessage;while(nLeft0)/接收数据ret=recv(sServer,ptr,5000,0);if(ret=SOCKET_ERROR)printf(recv()failed!n);return;if(ret=0)/客户端已经关闭连接printf(Clienthasclosedtheconnectionn);break;nLeft-=ret;ptr+=ret;printf(receivemessage:%sn,receiveMessage);/打印我们接收到的消息。/closesocket(sListen);/closesocket(sServer);/WSACleanup();【客户端】#includestdafx.h#include#include#include#defineSERVER_PORT5208/侦听端口voidmain()WORDwVersionRequested;WSADATAwsaData;intret;SOCKETsClient;/连接套接字structsockaddr_insaServer;/地址信息char*ptr;BOOLfSuccess=TRUE;/WinSock初始化wVersionRequested=MAKEWORD(2,2);/希望使用的WinSockDLL的版本ret=WSAStartup(wVersionRequested,&wsaData);if(ret!=0)printf(WSAStartup()failed!n);return;/确认WinSockDLL支持版本2.2if(LOBYTE(wsaData.wVersion)!=2|HIBYTE(wsaData.wVersion)!=2)WSACleanup();printf(InvalidWinSockversion!n);return;/创建Socket,使用TCP协议sClient=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);if(sClient=INVALID_SOCKET)WSACleanup();printf(socket()failed!n);return;/构建服务器地址信息saServer.sin_family=AF_INET;/地址家族saServer.sin_port=htons(SERVER_PORT);/注意转化为网络节序saServer.sin_addr.S_un.S_addr=inet_addr(192.168.1.127);/连接服务器ret=connect(sClient,(structsockaddr*)&saServer,sizeof(saServer);if(ret=SOCKET_ERROR)printf(connect()failed!n);closesocket(sClient);/关闭套接字WSACleanup();return;charsendMessage=hellothisisclientmessage!;ret=send(