> -----Ursprüngliche Nachricht-----
> Von: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
> Gesendet: 28.02.07 16:34:26
> An: Wireshark Developer mailinglist <wireshark-dev@xxxxxxxxxxxxx>
> Betreff: [Wireshark-dev] Importing initializers in plugins on Win32
> Hi list,
>
> I've been trying to import some of the true_false strings provided by
> libwireshark.dll into a plugin, but can't get the compiler to grock it.
>
> Here's the relevant code snippet from my source file.
>
> #include <epan/packet.h>
> #include <epan/xdlc.h>
>
> static hf_register_info hf[] =
> {
> { &hf_lap_p,
> { "Poll", "lap.control.p", FT_BOOLEAN, 8,
> [line 683] TFS(&flags_set_truth), XDLC_P_F, "", HFILL }},
> ....
> }
>
> Compiling this file, using VC6, gives
>
> packet-.c
> packet-.c(683) : error C2099: initializer is not a constant
> packet-.c(683) : warning C4047: 'initializing' : 'const void *' differs in levels of indirection from 'const int '
> packet-.c(683) : warning C4047: 'initializing' : 'unsigned int ' differs in levels of indirection from 'char [1]'
> packet-.c(683) : warning C4047: 'initializing' : 'int ' differs in levels of indirection from 'void *'
>
> So I looked at the export of the symbol flags_set_truth. As documented
> these shall be marked WS_VAR_IMPORT, which they are (see epan/tfs.h).
> They are also set in libwireshark.def as DATA.
> The nmake file is of the latest fashion with
> CFLAGS=/DHAVE_WIN32_LIBWIRESHARK_LIB /D_NEED_VAR_IMPORT_ $(CFLAGS) so the
> VAR_IMPORT should be covered.
>
> I've got the sneaking suspicion that you can't import constants this way
> from another DLL, although exporting dscp_vals[] from
> epan/dissectors/packet-ip.c does work!?
>
> Anyone a suggestion how to properly address this?
>
I've recently stumbled across this problem myself, when moving the CBA dissector into the PROFINET plugin.
AFAIK, this is caused as the compiler cannot know the size of this. So you *can* use this value inside the plugin (e.g. using val_to_str), but you cannot use it to *initialize* the hf_register_info.
Regards, ULFL
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