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int CCreateTCP_UDP::Readn(int fd, void *vptr, size_t nbytes)
{
size_t nleft;
ssize_t nread;
char *ptr;
ptr = (char*)vptr;
nleft = nbytes;
while (nleft > 0)
{
if ( (nread = read(fd, ptr, nleft)) < 0)
{
if (errno == EINTR)
nread = 0; /* and call read() again */
else
return(-1);
} else if (nread == 0)
break; /* EOF */
nleft -= nread;
ptr += nread;
}
return(nbytes - nleft); /* return >= 0 */
}
//vc6.0下运行ConSole Project
//---TcpClient.cpp---
#include <WINSOCK2.H>
#include <stdio.h>
void main()
{
//加载套接字库
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("192.168.173.129");
addrSrv.sin_family=AF_INET;
addrSrv.sin_port=htons(6000);
//向服务器发出连接请求
connect(sockClient,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));
//接收数据
char recvBuf[100];
recv(sockClient,recvBuf,100,0);
printf("%s\n",recvBuf);
//发送数据
send(sockClient,"This is lisi",strlen("This is lisi")+1,0);
//关闭套接字
closesocket(sockClient);
WSACleanup();
}
//---TCPSrv.cpp---
#include <WINSOCK2.H>
#include <stdio.h>
void main()
{
//加载套接字库
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;
}
//创建用于监听的套接字
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);
//绑定套接字
bind(sockSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));
//将套接字设成监听模式,准备接受客户请求
listen(sockSrv,5);
SOCKADDR_IN addrClient;
int len=sizeof(SOCKADDR);
while (1)
{
//等待客户请求到来
SOCKET sockConn=accept(sockSrv,(SOCKADDR*)&addrClient,&len);
char sendBuf[100];
sprintf(sendBuf,"Welcome %s to http://www.sunxin.org",
inet_ntoa(addrClient.sin_addr));
//发送数据
send(sockConn,sendBuf,strlen(sendBuf)+1,0);
char recvBuf[100];
//接收数据
recv(sockConn,recvBuf,100,0);
//打印接收的数据
printf("%s\n",recvBuf);
//关闭套接字
closesocket(sockConn);
}
}