virtual function problem

adina

Hi,
I have 2 classes in my application: class A and class B.
in CaptureDoc.h

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class CCaptureDoc : public CWinpcap

{

public:

    CCaptureDoc(wxFrame* capframe, CCaptureWindow* capwindow);
 
     void PacketHandler(struct pcap_pkthdr* pkt_header, const unsigned char* pkt_data);
 
    void WinpcapThreadEnded();
 
    bool m_capmaxperform;

private:

    CCaptureWindow* m_capwindow;

    wxFrame* m_capframe;

};

in CaptureDoc.cpp

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#include "CaptureDoc.h"
 
CCaptureDoc::CCaptureDoc(wxFrame* capframe, CCaptureWindow* capwindow)

{

   /* here some code */

}
 
void CCaptureDoc::PacketHandler(struct pcap_pkthdr* packet_header, const unsigned char* packet_data)

{

/* here some code */

}
 
void CCaptureDoc::WinpcapThreadEnded()

{

    /* here some code */

}

in winpcap.h

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class CWinpcap : public wxThread, wxEvtHandler {

/* ... code*/

virtual void PacketHandler(struct pcap_pkthdr* pkt_header, const unsigned char* pkt_data);

virtual void WinpcapThreadEnded(); 

/* code */

}

In winpcap.cpp member functions of the CWinpcap class are supposed to call the functions WinpcapThreadEnded() and PacketHandler()

I need the overriden functions in the derived class to get called by the base class and do their job. Is this the right way to solve this problem. However, I get an error LNK2001: unresolved external symbol....

If it cannot be done in this way, what would another way be ?
Any help would be very appreciated :)

Thanks,
Adina

adina

An observation to the above post: I don't want the base class to know who is inheriting from it. Therefore I don't instantiate a derived class object or something like it. I suppose that you may see the functions overriden in the derived class as callback functions. Is this possible to be done ?

Thanks,

Adina

adina

Hello again,
I've been reading a little about the template method design pattern.
I have put the two virtual functions WinpcapThreadEnded() and PacketHandler() in the base class as protected.
The functions from the base class that call these two functions are public and non-virtual.

Stiil I receive the same linking errors: error LNK2001 unresolved external WinpcapThreadEnded() and unresolved external PacketHandler().

Any ideas to this problem are very much welcomed.

Thanks,
Adina

virtual function problem

re: virtual function problem

re: virtual function problem

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