From: "Iñaki Baz Castillo" <ibc@...>
Date: 2009-10-22T21:55:16+09:00
Subject: Re: Creating and raising custom exception in Ruby C extension

El Jueves, 22 de Octubre de 2009, Iñaki Baz Castillo escribió:
> Hi, I'm trying to create a CustomError exception in a Ruby C extension and
>  raise it:
> 
>   VALUE class_standard_error = rb_const_get(rb_cObject,
>  rb_intern("StandardError")); VALUE class_custom_error =
>  rb_define_class_under(class_standard_error, "ClassError", rb_cObject);
>  rb_raise(class_custom_error, "Oh, a custom error occurred !!!");
> 
> Unfortunatelly when running it I get:
> 
>   ArgumentError: wrong number of arguments(1 for 0)
>     ./test_unit.rb:22:in `initialize'
>     ./test_unit.rb:22:in `new'
>     ./test_unit.rb:22:in `my_function'
>     ./test_unit.rb:22:in `test_01
> 
> Being "my_function" the Ruby method calling to the above C code.
> 
> I suspect that the line:
>   rb_raise(class_custom_error, "Oh, a custom error occurred !!!");
> is not correct. How should look the first argument?


Let's try the following real code:

	VALUE class_standard_error = rb_const_get(rb_cObject, rb_intern("StandardError"));
	VALUE argv[0];
	VALUE new_error = rb_class_new_instance(0, argv, class_standard_error);
	rb_raise(new_error, "Oh an error ocurred !!!");

When calling the function containing it from Ruby I get:

  NoMethodError: undefined method `new' for #<StandardError: StandardError>

What am I doing wrong?
Thanks a lot.

-- 
Iñaki Baz Castillo <ibc@aliax.net>