[fpc-pascal]XChat plugins using FPC

[Michael Van Canneyt]

On Thu, 24 Jul 2003, James Mills wrote:

> On Wed, Jul 23, 2003 at 08:50:35AM +0200, Michael Van Canneyt wrote:
> >
> >
> > On Wed, 23 Jul 2003, James Mills wrote:
> >
> > > On Wed, Jul 23, 2003 at 03:28:55AM +0200, Marco van de Voort wrote:
> > > > > I can successully compile and test the plugin source listed at
> > > > > http://xchat.org/docs/plugin20.html written in C.
> > > > >
> > > > > However I don't like C much and am wondering if it's possible to do the
> > > > > same thing in pascal... ? I know it has to be possible, but I need
> > > > > someone to start me off in the right direction...
> > > >
> > > > Probably yes, but you'll need to convert headers of xchat-plugin.h. The
> > > > "h2pas" util can be handy for this. (or at least it can save a lot of time)
> > >
> > > Okay I've converted the headers (step 1) :P
> > >
> > > $ h2pas -S -D -p -l xchat xchat-plugin.h
> > > at line 6 error : syntax error
> > > Illegal character in line 6
> > > "#define XCHAT_IFACE_VERSION    ((XCHAT_IFACE_MAJOR * 10000) + \"
> > > at line 7 error : syntax error
> > > Illegal character in line 7
> > > "                                (XCHAT_IFACE_MINOR * 100) + \"
> > >
> > >
> > >
> > > What do I do with these errors though ?
> >
> > run the file through the gcc preprocessor:
> >
> > gcc -E xchat-plugin.h -o xchat-plugin.hp
> > h2pas -S -D -p -l xchat xchat-plugin.hp
> >
> > Note that this destroys all '#define'  constants, so you'll have to
> > run h2pas a second time to get all constants.
> >
> > Michael.
> >
> >
> > _______________________________________________
> > fpc-pascal maillist  -  fpc-pascal at lists.freepascal.org
> > http://lists.freepascal.org/mailman/listinfo/fpc-pascal
>
> I've sucessfully now done all this and now have the headers converted...
> I have a problem though when trying to compiling a test plugin:
>
> $ fpc test
> Free Pascal Compiler version 1.0.6 [2002/08/10] for i386
> Copyright (c) 1993-2002 by Florian Klaempfl
> Target OS: Linux for i386
> Compiling test.pas
> Compiling xchatplugin.pas
> xchatplugin.pas(49,24) Error: Identifier not found XCHAT_PLUGIN
> xchatplugin.pas(49,36) Error: Error in type definition
> xchatplugin.pas(50,22) Error: Identifier not found XCHAT_LIST
> xchatplugin.pas(50,32) Error: Error in type definition
> xchatplugin.pas(51,22) Error: Identifier not found XCHAT_HOOK
> xchatplugin.pas(51,32) Error: Error in type definition
> xchatplugin.pas(55,25) Error: Identifier not found XCHAT_CONTEXT
> xchatplugin.pas(55,38) Error: Error in type definition
> xchatplugin.pas(61,24) Error: Duplicate identifier _XCHAT_PLUGIN
> xchatplugin.pas(61,24) Error: Duplicate identifier _XCHAT_PLUGIN
> xchatplugin.pas(62,60) Error: Identifier not found PXCHAT_PLUGIN
> xchatplugin.pas(62,96) Error: Type identifier expected
> xchatplugin.pas(62,96) Fatal: Syntax error, ) expected but FUNCTION found
>
>
> What's going on here ?

The unit is not correct. There are things that h2pas doesn't 'know'
about. C is case sensitive. Pascal is not. so duplicate identifiers can
exist. the C construct "xchat_plugin *" is translated to
'Pxchat_plugin', but that may or may not be defined already.

In general, a generated file may still need some manual editing before
it is compilable. This is perfectly normal.

Michael.