實現伺服器端的多線程SOCKET Server C++/VC

轉自：http://hi.baidu.com/eternity8013/blog/item/86bf7503c557deea09fa932b.html

 

 

想要實現的功能：在伺服器端有一個控制台程式（或者Windows服務），與多個用戶端程式通訊，其中主線程有一個socket綁定在一個固定連接埠上，負責監聽用戶端的Socket資訊。每當啟動一個用戶端程式，用戶端發送來一個socket串連請求，server端就新開啟一個線程，並在其中建立一個socket與該用戶端的socket通訊，直到用戶端程式關閉，結束該線程。主線程中的socket在應用程式退出時關閉。

這裡是Server端代碼的簡單示意，展示了如何建立多線程的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;
}