Hi 
I've done this several times and the way I do it is:
1. Look for the final dissector file, should be under epan/dissector/packet-xxx.c (in this case packet-snmp.c)
2. Copy the build command for asn2wrs as seen in the 4th line. In this case it looks like this:
asn2wrs.py -b -p snmp -c ./snmp.cnf -s ./packet-snmp-template -D . -O ../.. snmp.asn
3. Open the command prompt in your dissector's asn1 folder (/epan/dissector/asn1/snmp/)
4. Run asn2wrs.py using it's full path. In my case it's "C:\Development\wireshark\tools\asn2wrs.py" and add the parameters you saw in the generated file
so it should look line this:
C:\Development\wireshark\tools\asn2wrs.py -b -p snmp -c ./snmp.cnf -s ./packet-snmp-template -D . -O ../.. snmp.asn
 
This should create the new packet-snmp.c and .h files under epan/dissectors/ and override the existing ones
 
Darien
 
Sent: Monday, February 19, 2018 at 2:55 PM
From: "Dario Lombardo" <dario.lombardo...@gmail.com>
To: "Developer support list for Wireshark" <wireshark-dev@wireshark.org>
Subject: [Wireshark-dev] Regenerate asn dissector
Hi
I've modified epan/dissectors/asn1/snmp/packet-snmp-template.c and I want to regenerate the corresponding dissector.
I've found the cmake target epan/dissectors/asn1/snmp/generate_dissector-snmp, but building it doesn't regenerate the dissector.
What's the missing step?
Thanks.
Dario.
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