Function mrb_funcall_argv 

pub unsafe extern "C" fn mrb_funcall_argv(
    mrb: *mut mrb_state,
    val: mrb_value,
    name: mrb_sym,
    argc: mrb_int,
    argv: *const mrb_value,
) -> mrb_value

Call existing ruby functions. This is basically the type safe version of mrb_funcall.

 #include <stdio.h>
 #include <mruby.h>
 #include "mruby/compile.h"
 int
 main()
 {
   mrb_state *mrb = mrb_open();
   mrb_value obj = mrb_fixnum_value(1);

   if (!mrb) { }

   FILE *fp = fopen("test.rb","r");
   mrb_value obj = mrb_load_file(mrb,fp);
   mrb_funcall_argv(mrb, obj, MRB_SYM(method_name), 1, &obj); // Calling ruby function from test.rb.
   fclose(fp);
   mrb_close(mrb);
  }

@param mrb The current mruby state. @param val A reference to an mruby value. @param name_sym The symbol representing the method. @param argc The number of arguments the method has. @param obj Pointer to the object. @return mrb_value mrb_value mruby function value. @see mrb_funcall