Re: Problem with WSAStartup, error LNK2001

I try to programme a simply FTP client.
I use 3 files: FTPconnect.cpp,FTPconnect.h,FTP.cpp.
I use Visual Studio 2008
compiles are all right;but when I built:
there are 2 error :
FTPconnect.obj : error LNK2001: unresolved external symbol
__imp__WSAStartup@8
fatal error LNK1120: 1 unresolved externals

what is the problem;
code as fellow:

FTPconnect.h:

#include<string>
using namespace std;
class FTPconnect
{
private:
        string state;
        int IPadr;
public:
        void open(string hostadr);
        void dir(string dirname);
        void get_in_dir(string dirname);
        void get_file(string filename,string localadr);
        void upload_file(string filename);

};

 FTPconnect.cpp:

#include "FTPconnect.h"
#include <iostream>
#include <Winsock2.h>
using namespace std;
void FTPconnect::open(string hostadr)
{
        if (hostadr == "")
        {
                cout<<"Please enter the FTP sites which you want login:";
                cin>>hostadr;
        }
        //=B3=F5=CA=BC=BB=AFsocket

        WSADATA wsaData;
        int err;
        err = WSAStartup( 0x0101, &wsaData );
        if ( err != 0 ) cout<<"Error";

}

FTP.cpp:

#include "FTPconnect.h"
#include <iostream>
using namespace std;
void hint(string &command,string &information);
int main(void)
{
        string command,information;
        while(1)
        {
                hint(command,information);
                cout<<"command="<<command<<"information="<<information=

                if (command == "quit" || command == "bye")
                {
                        cout<<"GoodBye"<<endl;
                        break;
                }
                command = "";
                information = "";
        }
        return 0;}

void hint(string &command,string &information)
{
        string input;
        int local;
        cout<<"FTP>";
        getline(cin,input);
        local = input.find(" ");
        if (local == string::npos)
                command = input;
        else
        {
                command = input.substr(0,local);
                information = input.substr(local+1);
                cout<<"Has space"<<endl;
        }

}- =D2=FE=B2=D8=B1=BB=D2=FD=D3=C3=CE=C4=D7=D6 -

- =CF=D4=CA=BE=D2=FD=D3=C3=B5=C4=CE=C4=D7=D6 -