vc++ - static member is showing error
- by prabhakaran
I am using vc++(2010). I am trying to create a class for server side socket. Here is the header file
#include<winsock.h>
#include<string>
#include<iostream>
using namespace std;
class AcceptSocket
{
// static SOCKET s;
protected:
SOCKET acceptSocket;
public:
AcceptSocket(){};
void setSocket(SOCKET socket);
static void EstablishConnection(int portNo,string&);
static void closeConnection();
static void StartAccepting();
virtual void threadDeal();
static DWORD WINAPI MyThreadFunction(LPVOID lpParam);
};
SOCKET AcceptSocket::s;
and the corresponding source file
#include<NetWorking.h>
#include<string>
void AcceptSocket::setSocket(SOCKET s)
{
acceptSocket=s;
}
void AcceptSocket::EstablishConnection(int portno,string &failure)
{
WSAData w;
int error = WSAStartup(0x0202,&w);
if(error)
failure=failure+"\nWSAStartupFailure";
if(w.wVersion != 0x0202)
{
WSACleanup();
failure=failure+"\nVersion is different";
}
SOCKADDR_IN addr;
addr.sin_family=AF_INET;
addr.sin_port=htons(portno);
addr.sin_addr.s_addr=htonl(INADDR_ANY);
AcceptSocket::s=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if(AcceptSocket::s == INVALID_SOCKET)
failure=failure+"\nsocket creating error";
if(bind(AcceptSocket::s,(LPSOCKADDR) &addr,sizeof(addr)) == SOCKET_ERROR)
failure=failure+"\nbinding error";
listen(AcceptSocket::s,SOMAXCONN);
}
void AcceptSocket::closeConnection()
{
if(AcceptSocket::s)
closesocket(AcceptSocket::s);
WSACleanup();
}
void AcceptSocket::StartAccepting()
{
sockaddr_in addrNew;
int size=sizeof(addrNew);
while(1)
{
SOCKET temp=accept(AcceptSocket::s,(sockaddr *)&addrNew,&size);
AcceptSocket * tempAcceptSocket=new AcceptSocket();
tempAcceptSocket->setSocket(temp);
DWORD threadId;
HANDLE thread=CreateThread(NULL,0,MyThreadFunction,(LPVOID)tempAcceptSocket,0,&threadId);
}
}
DWORD WINAPI AcceptSocket::MyThreadFunction(LPVOID lpParam)
{
AcceptSocket * acceptsocket=(AcceptSocket *) lpParam;
acceptsocket->threadDeal();
return 1;
}
void AcceptSocket::threadDeal()
{
"You didn't define threadDeal in the derived class";
}
Now the main.cpp is
#include<Networking.h>
int main()
{
}
When I am compiling The error I got is
Error 1 error LNK2005: "private: static unsigned int AcceptSocket::s" (?s@AcceptSocket@@0IA) already defined in NetWorking.obj C:\Documents and Settings\prabhakaran\Desktop\check\check\main.obj check
Error 2 error LNK1169: one or more multiply defined symbols found C:\Documents and Settings\prabhakaran\Desktop\check\Debug\check.exe 1 1 check
Now anybody please enlighten me about this issue
