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编程是採用的流式套接字。
server端编程的步骤:
1:载入套接字库,创建套接字(WSAStartup()/socket());
2:绑定套接字到一个IP地址和一个port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,返回一个新的相应于此次连接的套接字(accept());
5:用返回的套接字和client进行通信(send()/recv());
6:返回,等待还有一连接请求;
7:关闭套接字,关闭载入的套接字库(closesocket()/WSACleanup())。
client编程的步骤:
1:载入套接字库,创建套接字(WSAStartup()/socket());
2:向server发出连接请求(connect());
3:和server端进行通信(send()/recv());
4:关闭套接字,关闭载入的套接字库(closesocket()/WSACleanup())。
第一式: 载入/释放Winsock库:
1.载入方法:
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.client: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port:
1.服务端: SOCKADDR_IN serverAddr
ZeroMemory((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/client连接:
1.服务端:等待client接入.
SOCKET Command_Sock = accept(Listen_Sock, ...)
2.client: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client接入.char buf[1024].
接收数据:recv(Command_Sock,buf, ...)
或
发送数据:send(Command_Sock,buf, ...)
2.client: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.client: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 < 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 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(); }