转自:说不完的故事
http://www.cnblogs.com/Sniper-quay/archive/2011/06/22/2086636.html
sockets(套接字)编程有三种,流式套接字(SOCK_STREAM),数据报套接字(SOCK_DGRAM),原始套接字(SOCK_RAW);基于TCP的socket编程是采用的流式套接字。
服务器端编程的步骤:
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()/WSACleanup())。客户端编程的步骤:
1:加载套接字库,创建套接字(WSAStartup()/socket()); 2:向服务器发出连接请求(connect()); 3:和服务器端进行通信(send()/recv()); 4:关闭套接字,关闭加载的套接字库(closesocket()/WSACleanup())。第一式: 加载/释放Winsock库:
1.加载方法:
WSADATA wsa;
/*初始化socket资源*/ if (WSAStartup(MAKEWORD(1,1),&wsa) != 0) { return; //代表失败 }
2.释放方法:
WSACleanup();
第二式: 构造SOCKET:
1.服务端:构造监听SOCKET,流式SOCKET.
SOCKET Listen_Sock = socket(AF_INET, SOCK_STREAM, 0)2.客户端:构造通讯SOCKET,流式SOCKET.
SOCKET Client_Sock = socket(AF_INET, SOCK_STREAM, 0)第三式:配置监听地址和端口:
1.服务端: SOCKADDR_IN serverAddrZeroMemory((char *)&serverAddr,sizeof(serverAddr));
serverAddr.sin_family = AF_INET; serverAddr.sin_port = htons(1234); /*本地监听端口:1234*/ serverAddr.sin_addr.s_addr = htonl(INADDR_ANY); /*有IP*/第四式: 绑定SOCKET:
1.服务端:绑定监听SOCKET.
bind(Listen_Sock,(struct sockaddr *)&serverAddr,sizeof(serverAddr))第五式: 服务端/客户端连接:
1.服务端:等待客户端接入.
SOCKET Command_Sock = accept(Listen_Sock, ...)2.客户端:请求与服务端连接.
int ret = connect(Client_Sock, ...)第六式: 收/发数据:
1.服务端:等待客户端接入.char buf[1024].
接收数据:recv(Command_Sock,buf, ...) 或 发送数据:send(Command_Sock,buf, ...)2.客户端:请求与服务端连接.char buf[1024].
发送数据:send(Client_Sock,buf, ...) 或 接收数据:recv(Client_Sock,buf, ...)第七式: 关闭SOCKET:
1.服务端:关闭SOCKET.
closesocket(Listen_Sock) closesocket(Command_Sock)2.客户端:关闭SOCKET.
closesocket(Client_Sock) #include <stdio.h> #include <Winsock2.h> void main() { WORD wVersionRequested; WSADATA wsaData; int err; wVersionRequested = MAKEWORD( 1, 1 ); err = WSAStartup( wVersionRequested, &wsaData ); if ( err != 0 ) { return ; } if ( LOBYTE( wsaData.wVersion ) != 1 || HIBYTE( wsaData.wVersion ) != 1 ) { WSACleanup( ); return ; } SOCKET sockSrv=socket(AF_INET,SOCK_STREAM,0); SOCKADDR_IN addrSrv; addrSrv.sin_addr.S_un.S_addr=htonl(INADDR_ANY); addrSrv.sin_family=AF_INET; addrSrv.sin_port=htons(6000); bind(sockSrv,(SOCKADDR*)&addrSrv, sizeof (SOCKADDR)); listen(sockSrv,5); SOCKADDR_IN addrClient; int len= sizeof (SOCKADDR); while (1) { SOCKET sockConn=accept(sockSrv,(SOCKADDR*)&addrClient,&len); char sendBuf[50]; sprintf (sendBuf, "Welcome %s to here!" ,inet_ntoa(addrClient.sin_addr)); send(sockConn,sendBuf, strlen (sendBuf)+1,0); char recvBuf[50]; recv(sockConn,recvBuf,50,0); printf ( "%s\n" ,recvBuf); closesocket(sockConn); } } |
#include#include void main(){ WORD wVersionRequested; WSADATA wsaData; int err; wVersionRequested = MAKEWORD( 1, 1 ); err = WSAStartup( wVersionRequested, &wsaData ); if ( err != 0 ) { return; } if ( LOBYTE( wsaData.wVersion ) != 1 || HIBYTE( wsaData.wVersion ) != 1 ) { WSACleanup( ); return; } SOCKET sockClient=socket(AF_INET,SOCK_STREAM,0); SOCKADDR_IN addrSrv; addrSrv.sin_addr.S_un.S_addr=inet_addr("127.0.0.1"); addrSrv.sin_family=AF_INET; addrSrv.sin_port=htons(6000); connect(sockClient,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR)); send(sockClient,"hello",strlen("hello")+1,0); char recvBuf[50]; recv(sockClient,recvBuf,50,0); printf("%s\n",recvBuf); closesocket(sockClient); WSACleanup();}