各位高手能否帮忙解决一下下面这个程序的问题，while循环时为和会出现服务器无限重发最后一包数据。谢谢了！ #include "stdafx.h" #include <stdio.h> #include <Winsock2.h> #include <signal.h> #include <iostream.h> #include <Windows.h> #include <io.h> #include <string.h> #include <stdarg.h> #include <errno.h> int main(int argc, char* argv[]) { struct sockaddr_in address,address1; int i,j,s,s1,tn[4]={0}; int err; int new_s,n1; int n=0; int ret; struct timeval t2; char buf[1000],buftem[1000]; int optLen = sizeof(int); fd_set r, w, e; WORD wVer; WSADATA wsaData; wVer=MAKEWORD(1,1); err=WSAStartup(wVer,&wsaData);//判断Windows sockets dll版本,初始化 if(err!=0) return(0);
s = socket (AF_INET, SOCK_STREAM, 0);//创建socket if (s == -1) {j=WSAGetLastError(); return -1; } i = 1; address.sin_family = AF_INET; address.sin_port = htons (8000);//监听端口8000
address.sin_addr.s_addr = INADDR_ANY; if (bind (s, (struct sockaddr *)&address, sizeof (address)) == -1) { return -1; }
if (listen (s, 1) == -1)//监听，设置监听队列为1，为了简化程序 { return -1; } printf("正在等待请求，请稍后。。。。。。\n"); new_s=accept(s,NULL,NULL);//accept客户端连接，new_s是用于代理和客户端的连接 SOCKET ConnectSocket; ConnectSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);//创建新连接，用于连接http服务器 address.sin_family=AF_INET; address.sin_addr.s_addr = inet_addr( "127.0.0.1" ); address.sin_port = htons( 80 );
if (ConnectSocket!=INVALID_SOCKET) { printf("socket创建\n");
int nn=connect( ConnectSocket, (SOCKADDR*) &address, sizeof(address) );}//进行连接 while(1)//循环处理 { FD_ZERO (&r); FD_ZERO (&w); FD_ZERO (&e); FD_SET(new_s,&r); FD_SET(new_s,&w); FD_SET(new_s,&e); FD_SET(ConnectSocket,&r); FD_SET(ConnectSocket,&w); FD_SET(ConnectSocket,&e); t2.tv_sec=5; t2.tv_usec=5*1000; ret=select(new_s+1,&r,&w,&e,NULL);//查看socket状态 if(FD_ISSET(new_s,&r))//如果客户端发送数据包，则接收并转发服务器端 { n = recv(new_s, buf, strlen(buf),0); if(n!=-1) { tn[0]++; printf("这是从客户端收到的第%d包，内容是：%s，\n报文长度：%d.\n",tn[0],buf,n);//打印相关信息用于调试 n1=send(ConnectSocket,buf,n,0); if(n1!=-1) { tn[1]++; printf("向服务器端转发报文数%d,转发报文长度%d\n",tn[1],n1); } } } if(FD_ISSET(ConnectSocket,&r))//如果服务器端发送数据包，接收并转发客户端 {
n1=recv(ConnectSocket,buftem,strlen(buftem),0); if(n1!=-1) { tn[2]++; printf("这是从服务器端收到的第%d包，内容是：%s,报文长度是：%d.\n",tn[2],buftem,n1); if(FD_ISSET(new_s,&w)) //strcat(buftem,"#13#10"); {n = send(new_s, buftem,n1,0); if(n!=-1) { tn[3]++; printf("向客户端转发报文数%d,转发报文长度%d.\n",tn[3],n); //if(tn[3]==50)///////////此处因为程序会无限循环发报，所以设置一最大发包数控制程序//////////////// //{break;} } } //Sleep(200); } } } } 这个程序可以在vc下直接执行。谢谢！另如何让连接keep alive?
