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Wireshark build error

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I'm getting the following error while trying to build a plugin for wireshark 3.2.1 on my PC (windows 10)

C:\Users\ravishas\Desktop\wsnew\plugins\epan\expand\packet-expand.c(778,43): warning C4113: 'void (__cdecl *)(tvbuff_t *,packet_info *,proto_tree *)' differs in parameter lists from 'dissector_t' [C:\Development\build_try\plugins\epan\expand\expand.vcxproj]

C:\Users\ravishas\Desktop\wsnew\plugins\epan\expand\packet-expand.c(778,43): warning C4133: 'function': incompatible types - from 'void (__cdecl *)(tvbuff_t *,packet_info *,proto_tree *)' to 'dissector_t' [C:\Development\build_try\plugins\epan\expand\expand.vcxproj]

I have looked into the function and there is an additional " void * " parameter in the dissector_t function. Should that parameter be retained or is there any other workaround?

Thanks in advance

Sriram R's avatar
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Sriram R
asked 2020-03-05 04:59:47 +0000, updated 2020-03-05 06:13:00 +0000
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I have looked into the function and there is an additional " void * " parameter in the dissector_t function.

Yes, there is. A dissector is handed, as its last argument, a void *, which is a pointer to private data being passed to the dissector. Most dissectors are just passed a null pointer; what it gets passed depends on what's calling it.

Should that parameter be retained

Yes. It has to be there, even if the dissector ignores it.

Guy Harris's avatar
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Guy Harris
answered 2020-03-05 18:43:45 +0000
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But it still gives me the same error. How do I rectify it?

Sriram R's avatar Sriram R (2020-03-16 08:50:53 +0000) edit
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