Re: calling scheme procedures by name from C

[Richard Shann]

On Sun, 2009-08-02 at 14:00 +0100, Paul Emsley wrote:
> Richard Shann wrote:
> > 
> > SCM proc =  gh_str2scm("d-UploadRoutine",  strlen("d-UploadRoutine"));
> > // proc = scm_string_to_symbol("d-UploadRoutine");
> > // proc = scm_string_to_symbol( gh_str2scm("d-UploadRoutine",  
> > strlen("d-UploadRoutine")));
> > SCM arg1 =  gh_str2scm("hello", strlen("hello"));
> > SCM arg2 =  gh_str2scm("he2lo", strlen("hello"));
> > SCM arg3 =  gh_str2scm("he3lo", strlen("hello"));
> > SCM arg4 =  gh_str2scm("he4lo", strlen("hello"));
> > scm_call_4(proc, arg1, arg2, arg3, arg4);
> > 
> > The three definitions of proc lead to the following three error messages:
> > 
> > ERROR: In procedure apply:
> > ERROR: Wrong type argument in position 1: "d-UploadRoutine"
> > 
> > 
> 
> It is indeed the wrong type of argument.
> 
> Look at scm_c_define_gsubr()
This is for defining scheme procedures using C. My procedure is defined
in scheme, I wanted to call it from C, for which the code in the other
response 

func_symbol = scm_c_lookup("d-UploadRoutine");
proc = scm_variable_ref(func_symbol);

does the trick.
Thanks for the response,
Richard


> 
> http://www.gnu.org/software/guile/manual/html_node/Primitive-Procedures.html
> 
> Paul.
> 
> and p.s. use the new style interface not the gh_* one. e.g.
> SCM arg1 = scm_makfrom0str("hello");
> 
> 
> 
>