[Ecls-list] Newbie get/set question

[David Creelman]

Hi Dean,

Thanks, that's what I was after and it works well.

I should have looked a little more carefully in the doco.

Cheers
David

On Mon, 2005-11-21 at 12:56 +1100, Dean O'Connor wrote:
> this might help ...
> 
> Here's relevant doco page:
>     http://ecls.sourceforge.net/ecldev/Integers.html#Integers
> 
> I'm not quite at the point of fully testing it, but this is what I have 
> been using.
> 
> static cl_object check_value(cl_object int_obj, cl_object float_obj)
> {
>     assert_type_integer(int_obj);
>     // did not see assert for long float ??
> 
>    int value1 = fixint(int_obj);
>    double value2 = lf(float_obj);
> 
>     return Cnil;
> }
> 
> Cheers
> Dean.
> 
> David Creelman wrote:
> 
> >Hi Juan,
> >
> >Okay, cool.
> >
> >.. So I get back a cl_object from cl_[safe]eval. If I want to read an
> >integer, do I just read big from the cl_object ?
> >
> >Cheers
> >DC
> >
> >On Fri, 2005-11-18 at 11:04 +0100, Juan Jose Garcia Ripoll wrote:
> >  
> >
> >>On Fri, 2005-11-18 at 18:57 +1100, David Creelman wrote:
> >>    
> >>
> >>>I can run scripts/functions, but it's not clear to me how I get a
> >>>variable from ECL over to C/C++. There is mention of ffi:, but I don't
> >>>quite get that. Any pointers would be appreciated.
> >>>      
> >>>
> >>You can
> >>
> >>1) Get the output directy from cl_eval() if there is a single lisp
> >>statement.
> >>
> >>2) You can, in compiled files, access C variables using FFI. The value
> >>of this C variable can be set to whatever your lisp code wants to
> >>output. I find this, however, overkilling.
> >>
> >>3) You can simply define a special variable and assign it the value you
> >>want. To recover this value from C there are multiple possibilities.
> >>Perhaps the simplest (but not the safest one) is to use
> >>
> >>	c_string_to_object("thepackage::*thevariable*")
> >>
> >>which will read the string and evaluate the symbol *thevariable* from
> >>the package "THEPACKAGE" and return the value. Formerly you might have
> >>done something like
> >>
> >>	(in-package :thepackage)
> >>
> >>	(setf *thevariable* (+ 1 1))
> >>
> >>Have fun,
> >>
> >>
> >>Juanjo
> >>
> >>
> >>
> >>
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David Creelman
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