On Wed, Sep 24, 2003 at 12:03:14PM -0300, Dario Tamburi wrote:
> I do:
>
> manija=pcap_open_live(d->name,65536,1,1000,buffer);
> if(manija==NULL)
> {
> cout << "error al abrir la interfaz";
I suggest you instead do
cout << "error al abrir la interfaz: " << buffer;
so that you also see the error message from "pcap_open_live()", not just
a message saying you got an error opening the interface.
> pcap_freealldevs(dispositivos);
> return 1;
> }
>
> pcap_freealldevs(dispositivos);
> cout << "escuchabdo sobre: " << d->description;
You should probably do something such as
if (d->description != NULL)
cout << "escuchabdo sobre: " << d->description;
else
cout << "escuchabdo sobre: " << d->name;
as there's no guarantee that "d->description" is non-NULL. (It might
never be null on Windows, but I don't know that WinPcap will guarantee
that - and if you check for it, your program will be more likely to work
on UNIX platforms where it *can* be null.)
> /*capturo paquetes*/
> pcap_loop(manija,0,packet_handler,NULL);
> return 0;
>
> and I has the error:
>
> error C2664: 'pcap_loop' : cannot convert parameter 3 from 'void (char,const struct
> pcap_pkthdr,const char)' to 'void (__cdecl *)(unsigned char *,const struct
> pcap_pkthdr *,const unsigned char
>
> Why?
Because "packet_handler()" isn't a C function (you might have to wrap it
in
extern "C" {
...
};
to ensure that it's a C function, not a C++ function) that takes, as its
arguments:
an "unsigned char *";
a "const struct pcap_pkthdr *;
a "const unsigned char *".
It must take three *pointers* as arguments; it cannot take "char",
"const struct pcap_pkthdr", and "const char" as arguments.
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