Re: [slang-users] Slirp / slirp_map_struct() not working

[Laurent Perez <laurent.perez@xxxxxxxxxx>]

* Sebastian Gniazdowski <sgniazdowski@xxxxxxxxx> [2021-05-29 14:54] :

[...]

> The docs say:
> 
> "In the present implementation additional manual coding is required to
> define the structure layout used by the SLang_push_cstruct() and
> SLang_pop_cstruct() routines."
> 
> Which manual code?

Hi Sebastian,

The interpreter needs to know about your C structure layout, which
can be done by filling a SLang_CStruct_Field_Type table (see [1]) :

SLang_CStruct_Field_Type WindowEntry_Layout [] =
{
  MAKE_CSTRUCT_FIELD(WindowEntry, name, "name",SLANG_STRING_TYPE, 0),
  MAKE_CSTRUCT_FIELD(WindowEntry, path, "path",SLANG_STRING_TYPE, 0),
  MAKE_CSTRUCT_FIELD(WindowEntry, syntax, "syntax",SLANG_STRING_TYPE, 0),
  SLANG_END_CSTRUCT_TABLE
};      

This is the "additional manual coding" part that Slirp manual is
refering to.

Structures can then be passed from / to S-Lang this way :

WindowEntry en;

SLang_push_cstruct ((VOID_STAR)&en, WindowEntry_Layout);
SLang_pop_cstruct ((VOID_STAR)&en, WindowEntry_Layout);

For a working example, please look at slgtk code (GdkColor,
GdkRectangle...)

Regards ;


Laurent.



References :
------------
[1] https://www.jedsoft.org/slang/doc/html/cslang-5.html#ss5.5


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