vc++ - 静态成员显示错误 [英] vc++ - static member is showing error

问题描述

我正在使用 vc++(2010).我正在尝试为服务器端套接字创建一个类.这是头文件

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;

以及对应的源文件

#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";
}

现在 main.cpp 是

Now the main.cpp is

#include<Networking.h>

int main()
{
}

当我编译时，我得到的错误是

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

什么可能导致这种情况，我该如何解决?

What might cause this and how do I solve it?

推荐答案

把它放在你的 .cpp 文件而不是你的 .h 文件中:

Put this in your .cpp file instead of in your .h file:

SOCKET AcceptSocket::s;

如果您的 .h 文件中有它，它会包含在许多 .cpp 文件中.因此，当您链接时，它不知道该使用哪个.

It is being included in many .cpp files if you have it in your .h file. And hence when you link it doesn't know which one to use.

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