Re: Chained CAN dissecector: Can not get reference for CAN dissector

[Sebastian Schildt <sebastian () frozenlight de>]

Hi,

Thanks for the answers, now I at least understand what is going on. Unfortunately it seems,  the data parameter in the 
dissector call is not promoted to Lua (maybe somthing for another enhancement :) ). So I will probably try to implement 
Pascal's solution first.

Sebastian

> Am 15.12.2015 um 12:53 schrieb Michael Mann <mmann78 () netscape net>:
>
> The CAN ID is passed as the "data" parameter to the subdissector from the CAN dissector.  The C code of a 
> subdissector to handle it would be as follows:
>  
> struct can_identifier
> {
>     guint32 id;
> };
>  
> static int subdissector_function(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
> {
>     struct can_identifier can_id;
>     can_id = *((struct can_identifier*)data);
>     if (can_id.id != 42)
>     {
>         return 0;
>     }
>     ...
> }
>  
> I'm not as familiar with Lua to know how to setup the equivalent, but you shouldn't need to "override" the CAN 
> dissector to get the CAN ID.
>  
>  
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