实现服务器端的多线程SOCKET Server

实现服务器端的多线程SOCKET Server



想要实现的功能：在服务器端有一个控制台程序（或者Windows服务），与多个客户端程序通讯，其中主线程有一个socket绑定在一个固定端口上，负责监听客户端的Socket信息。每当启动一个客户端程序，客户端发送来一个socket连接请求，server端就新开启一个线程，并在其中创建一个socket与该客户端的socket通讯，直到客户端程序关闭，结束该线程。主线程中的socket在应用程序退出时关闭。

这里是Server端代码的简单示意，展示了如何创建多线程的Socket Server。

#include  "StdAfx.h"  
#include  <stdio.h>  
 
DWORD  WINAPI  AnswerThread(LPVOID  lparam)  
{  
           SOCKET  ClientSocket=(SOCKET)(LPVOID)lparam;  
 
           int  bytesRecv;  
           char  sendbuf[32]="";  
           char  recvbuf[32]="";  
 
           while(1)  
           {  
                       bytesRecv=SOCKET_ERROR;  
                       for(int  i=0;i<(int)strlen(recvbuf);i++)  
                       {   recvbuf[i]=''''\0'''';  }

  
                       while(bytesRecv==SOCKET_ERROR)  
                       {  //Receiving Data
                                   bytesRecv=recv(ClientSocket,recvbuf,32,0);  
                       }  

                     

                       //Write your processing code here
                       send(ClientSocket,recvbuf,strlen(recvbuf),0);  
                       printf("%s\n",recvbuf);  
           }  
           return  0;  
}  
 
int  main(int  argc,char*  argv[])  
{  
           //initialize  Winsock  
           WSADATA  wsaData;  
           int  iRet=WSAStartup(MAKEWORD(2,2),&wsaData);  
           if(iRet!=NO_ERROR)  
                       printf("Error  at  WSAStartup()\n");  
             
           //create  a  socket  
           SOCKET  m_socket;  
           m_socket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);  
           if(m_socket==INVALID_SOCKET)  
           {  
                       printf("Error  at  socket():%ld\n",WSAGetLastError());  
                       WSACleanup();  
                       return  0;  
           }  
 
           //bind  a  socket  
           sockaddr_in  service;  
           service.sin_family=AF_INET;  
           service.sin_addr.s_addr=inet_addr("172.16.3.250");  
           service.sin_port=htons(2501);  
 
           if(bind(m_socket,(SOCKADDR*)&service,sizeof(service))==SOCKET_ERROR)  
           {  
                       printf("bind()  failed.\n");  
                       closesocket(m_socket);  
                       return  0;  
           }  
           else  
                       printf("bind  OK.\n");  
 
           //listen  on  a  socket  
           if(listen(m_socket,20)==SOCKET_ERROR)  
                       printf("Error  listening  on  socket.\n"); 



           else  
                       printf("listening  ok.\n");  
 
           //accept  a  connection  
           SOCKET  AcceptSocket;  
             
           printf("Waiting  for  a  client  to  connect...\n");  
           while(1)  
           {  
                       AcceptSocket=SOCKET_ERROR;  
                       while(AcceptSocket==SOCKET_ERROR)  
                       {  
                                   AcceptSocket=accept(m_socket,NULL,NULL);  
                       }  
                       printf("Client  Connected.\n");  
                         
                       DWORD  dwThreadId;  
                       HANDLE  hThread;  
                         
                       hThread=CreateThread(NULL,NULL,            AnswerThread,  
                                   (LPVOID)AcceptSocket,0,&dwThreadId);  
                       if(hThread==NULL)  
                       {  
                                   printf("CreatThread  AnswerThread()  failed.\n");  
                       }  
                       else  
                       {  
                                   printf("CreateThread  OK.\n");  
                       }  
           }  
           return  0;  
}

 

 

Socket的客户端程序就很简单了，可以使用VB拖一个WinSock控件到Form中，然后连接服务器的Socket并发送数据就行了。