[Winpcap-users] [4.0.2]pcap_handler calling convention

Gianluca Varenni gianluca.varenni at cacetech.com
Fri Jul 11 15:48:02 GMT 2008

More than changing the calling convention from __cdecl to __stdcall (which 
is a breaking change), it should be documented somewhere that the callback 
must use the __cdecl calling convention. Or maybe providing a macro like 

Have a nice day

----- Original Message ----- 
From: "Marco Perrando" <marco.perrando at gmail.com>
To: <winpcap-users at winpcap.org>
Sent: Friday, July 11, 2008 5:25 AM
Subject: [Winpcap-users] [4.0.2]pcap_handler calling convention

> Hi!
> I am working on a piece of software that uses the winpcap dlls.
> I was having some troubles. In short words, these were related to the
> calling convention of the pcap_handler callback.
> This callback uses the __cdecl calling convention (the default for c 
> code).
> Now I have overcome the problem by declaring in my framework the
> callback with the __cdecl calling convention, but IMHO it should be
> annotated with the c-macro CALLBACK (that implies the __stdcall)
> because it is visible to the dll users.
> Regards,
> Marco.
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> Winpcap-users at winpcap.org
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