Using Sniffer within a class

[savio]

Hi Esteban ,

I have a problem with using the Sniffer within a class, no matter the changes i make, the member function does'nt match the sniffer packet handler function type.

My Program has the following structure:

using namespace std;

using namespace Crafter;

class Proto{

private:

Sniffer *sniff;

public:

void packet_handler(Packet *packet,void *user)

{

packet->Print();

}

void My_Sniffer()

{

sniff = new Sniffer("","eth0",&Proto::packet_handler);

sniff->Capture();

}

};

The problem is with the packet handler function. I keep getting this compilation error:

error: no matching function for call to 'Crafter::Sniffer::Sniffer(std::string, std::string, void (Proto::*)(Crafter::Packet*, void*))

I hope you can help me with a fix, A correction code would be much appreciated.

Thank You

[savio]

Nevermind I solved it by converting the function:

Void (*func_ptr)(packet*,void*) = &Proto::packer_handler;

Sniffer sniff("","eth0",func_ptr);

And I declared the member function as static

[Esteban Pellegrino]

Yes, glad you figure it out...  The problem is that member functions on c++ has an extra "this" pointer and that is not the signature of the function the Sniffer expects. You should declare it as static member function or use another function external to the class.

Best,

Esteban

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