1. fptr / Matt Lewis
Hi Matt,
You ought to add duplicate versions of (or add a parameter to) the
call_xxx() functions that return signed values rather than unsigned. I
find most libraries I use return signed error codes from the functions
and put the "real" return value in some pre-allocated location that you
pass as a parameter....
2. Re: fptr / Matt Lewis
When I tried to use fptr.e for Winux, I came across 2 imediate problems.
The first one, was that I seemed to crash and burn when calling void functions.
The second, was that the parameters and return values were all assumed to be
ints. What if i had wanted to pass a float, or a double, or a long long? (Or
long double? tho currently Eu doesnt support that.)
We need a way to specficy both return value and parameter value type conversion
when calling functions by pointer. Perhaps a call_cdecl(fptr, param_type,
params, ret_type)
setup is needed. (We could even use C_INT and friends from dll.e, if wanted, for
specifying type conversion.)
jbrown
On Thu, Feb 13, 2003 at 07:14:54AM -0500, Matthew Lewis wrote:
>
> Yes, just yesterday I considered that, since I came across that problem.
> For now, I use this piece of code to convert:
>
> constant sign_conversion = allocate(4)
> global function signed( atom x )
> poke4(sign_conversion,x)
> return peek4s( sign_conversion )
> end function
>
> In following the peek4 example, should I name them call_cdecls() and
> call_cdeclu()? Or just add call_cdecl_signed() to be really explicit?
>
> Matt Lewis
>
> > From: Andy Serpa [mailto:ac at onehorseshy.com]
>
> > Hi Matt,
> >
> > You ought to add duplicate versions of (or add a parameter to) the
> > call_xxx() functions that return signed values rather than
> > unsigned. I
> > find most libraries I use return signed error codes from the
> > functions
> > and put the "real" return value in some pre-allocated
> > location that you
> > pass as a parameter....
>
>
>
> TOPICA - Start your own email discussion group. FREE!
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