Re: calling scheme procedures by name from C

[Paul Emsley]

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()

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");