C SOCKET 服务器端如何支持多路收发？
#pragma comment(lib,"wsock32.lib")
#include <stdio.h>
#include <winsock2.h>
#include <winsock2.h>
#define SERVER_PORT 5208 //侦听端口
void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int ret, nLeft, length;
SOCKET sListen, sServer; //侦听套接字，连接套接字
struct sockaddr_in saServer, saClient; //地址信息
char receiveMessage[1024],sendMessage[1024];
int i,L;
//WinSock初始化
wVersionRequested=MAKEWORD(2, 2); //希望使用的WinSock DLL 的版本
ret=WSAStartup(wVersionRequested, &wsaData);
if(ret!=0)
{
printf("WSAStartup() failed!\n");
return;
}
//创建Socket,使用TCP协议
sListen=socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sListen == INVALID_SOCKET)
{
WSACleanup();
printf("socket() faild!\n");
return;
}
//构建本地地址信息
saServer.sin_family = AF_INET; //地址家族
saServer.sin_port = htons(SERVER_PORT); //注意转化为网络字节序
saServer.sin_addr.S_un.S_addr = htonl(INADDR_ANY); //使用INADDR_ANY 指示任意地址
//绑定
ret = bind(sListen, (struct sockaddr *)&saServer, sizeof(saServer));
if (ret == SOCKET_ERROR)
{
printf("bind() faild! code:%d\n", WSAGetLastError());
closesocket(sListen); //关闭套接字
WSACleanup();
return;
}
//侦听连接请求
ret = listen(sListen, 5);
if (ret == SOCKET_ERROR)
{
printf("listen() faild! code:%d\n", WSAGetLastError());
closesocket(sListen); //关闭套接字
return;
}
printf("Waiting for client connecting!\n");
printf("Tips: Ctrl+c to quit!\n");
//阻塞等待接受客户端连接
while(1)//循环监听客户端，永远不停止，所以，在本项目中，我们没有心跳包。
{
length = sizeof(saClient);
sServer = accept(sListen, (struct sockaddr *)&saClient, &length);
if (sServer == INVALID_SOCKET)
{
printf("accept() faild! code:%d\n", WSAGetLastError());
closesocket(sListen); //关闭套接字
WSACleanup();
return;
}
nLeft = sizeof(receiveMessage);
printf("nleft Length:%d",nLeft);
while(nLeft>0)
{
//接收数据
ret = recv(sServer, receiveMessage, 1024, 0);
printf("ret Length:%d",ret);
if (ret == SOCKET_ERROR)
{
printf("recv() failed!\n");
return;
}
if (ret == 0) //客户端已经关闭连接
{
printf("Client has closed the connection\n");
break;
}
L=strlen(receiveMessage);
printf("ReciveData Length:%d",L);
printf("ReciveData:");
for(i=0;i<ret;i++)
{
printf("%02X",(receiveMessage[i]&0xff));
}
sendMessage[0]=0x31;
sendMessage[1]=0x32;
ret=send(sServer,sendMessage,2,0);
printf("send length:%d\n",ret);
printf("\n");
}
}
// closesocket(sListen);
// closesocket(sServer);
// WSACleanup();
}
