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服务器:
#include "stdafx.h"
#include <iostream>
using namespace std;
#include <winsock2.h>
#pragma comment(lib,"ws2_32.lib")
#define MYPORT 9000 // the port users will be connecting to
#define BACKLOG 10 // how many pending connections queue will hold
#define BUF_SIZE 200
int fd_A[BACKLOG]; // accepted connection fd
int conn_amount; // current connection amount
void showclient()
{
int i;
printf("client amount: %d\n", conn_amount);
for (i = 0; i < BACKLOG; i++) {
printf("[%d]:%d ", i, fd_A[i]);
}
printf("\n\n");
}
int main(int argc, char* argv[])
{
int sock_fd, new_fd; // listen on sock_fd, new connection on new_fd
struct sockaddr_in server_addr; // server address information
struct sockaddr_in client_addr; // connector's address information
// socklen_t sin_size;
int yes = 1;
char buf[BUF_SIZE];
int ret;
int i;
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested=MAKEWORD(1,1);
err=WSAStartup(wVersionRequested,&wsaData);
if (err !=0)
{
return -1;
}
if(LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1)
{
WSACleanup();
return -1;
}
if ((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
if (setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR, (char*)&yes, sizeof(int)) == -1) {
perror("setsockopt");
exit(1);
}
int on = 1;
ret = setsockopt( sock_fd, SOL_SOCKET, SO_REUSEADDR,(char*)&on, sizeof(on) );
int nNetTimeout=2000;//2秒
//设置发送时限
setsockopt(sock_fd,SOL_SOCKET,SO_SNDTIMEO,(char *)&nNetTimeout,sizeof(int) );
//设置接收时限
setsockopt(sock_fd,SOL_SOCKET,SO_RCVTIMEO,(char *)&nNetTimeout,sizeof(int));
ret = setsockopt( sock_fd, SOL_SOCKET, SO_REUSEADDR,(char*)&on, sizeof(on) );
server_addr.sin_family = AF_INET; // host byte order
server_addr.sin_port = htons(MYPORT); // short, network byte order
server_addr.sin_addr.s_addr = INADDR_ANY; // automatically fill with my IP
memset(server_addr.sin_zero, '\0', sizeof(server_addr.sin_zero));
if (bind(sock_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1)
{
perror("bind");
exit(1);
}
if (listen(sock_fd, BACKLOG) == -1)
{
perror("listen");
exit(1);
}
printf("listen port %d\n", MYPORT);
fd_set fdsr;
int maxsock;
struct timeval tv;
conn_amount = 0;
maxsock = sock_fd;
while (1)
{
// initialize file descriptor set
FD_ZERO(&fdsr);
FD_SET(sock_fd, &fdsr);
// timeout setting
tv.tv_sec = 30;
tv.tv_usec = 0;
// add active connection to fd set
for (i = 0; i < BACKLOG; i++)
{
if (fd_A[i] != 0)
{
FD_SET(fd_A[i], &fdsr);
}
}
ret = select(maxsock + 1, &fdsr, NULL, NULL, &tv);
if (ret < 0)
{
perror("select");
break;
}
else if (ret == 0)
{
printf("timeout\n");
continue;
}
// check every fd in the set
for (i = 0; i < conn_amount; i++)
{
if (FD_ISSET(fd_A[i], &fdsr))
{
cout<<"Recv Begin!\n";
ret = recv(fd_A[i], buf, sizeof(buf), 0);
if (ret <= 0)
{ // client close
printf("client[%d] close\n", i);
closesocket(fd_A[i]);
FD_CLR(fd_A[i], &fdsr);
fd_A[i] = 0;
}
else
{ // receive data
if (ret < BUF_SIZE)
memset(&buf[ret], '\0', 1);
printf("client[%d] send:%s\n", i, buf);
}
}
}
// check whether a new connection comes
if (FD_ISSET(sock_fd, &fdsr))
{
int len = sizeof(client_addr);
new_fd = accept(sock_fd, (struct sockaddr *)&client_addr, &len);
if (new_fd <= 0)
{
perror("accept");
continue;
}
// add to fd queue
if (conn_amount < BACKLOG)
{
fd_A[conn_amount++] = new_fd;
printf("new connection client[%d] %s:%d\n", conn_amount,
inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
if (new_fd > maxsock)
maxsock = new_fd;
}
else
{
printf("max connections arrive, exit\n");
send(new_fd, "bye", 4, 0);
closesocket(new_fd);
break;
}
}
showclient();
}
// close other connections
for (i = 0; i < BACKLOG; i++) {
if (fd_A[i] != 0) {
closesocket(fd_A[i]);
}
}
exit(0);
return 0;
}
客户端:
void CSocketClientDlg::OnButton1()
{
WORD vVersion;
WSADATA wsData;
int iErr;
vVersion = MAKEWORD(2,0);
iErr = WSAStartup(vVersion,&wsData);
if(iErr!=0)
{
AfxMessageBox("Socket2.0初始化失败,Exit!");
return;
}
//CString szServerIP("192.168.0.16");
char *pszServerIP = "127.0.0.1";
sockaddr_in Server;
Server.sin_family = AF_INET;
Server.sin_port = htons(9000);
Server.sin_addr.S_un.S_addr = inet_addr(pszServerIP);
memset(&Server.sin_zero,0,8);
m_clientSocket = socket(AF_INET,SOCK_STREAM,0);
if(m_clientSocket == INVALID_SOCKET)
{
TRACE("Create Socket Failed!\n");
return;
}
if(connect(m_clientSocket,(struct sockaddr*)&Server,sizeof(struct sockaddr)) == -1)
{
TRACE("Connect Server Failed!\n");
return;
}
else
{
m_bConFlag = true;
}
}
void CSocketClientDlg::OnButton2()
{
UpdateData();
int iSendSize = 0;
if(m_bConFlag)
{
iSendSize = send(m_clientSocket,m_strMsg.GetBuffer(0),m_strMsg.GetLength(),0);
}
}