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Hi, I'm trying to create a CustomError exception in a Ruby C extension and =
raise it:

VALUE class_standard_error =3D rb_const_get(rb_cObject, rb_intern("Standa=
rdError"));
VALUE class_custom_error =3D 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?

Thanks a lot.

=2D-=20
I=C3=B1aki Baz Castillo <>

El Jueves, 22 de Octubre de 2009, I=C3=B1aki Baz Castillo escribi=C3=B3:
> Hi, I'm trying to create a CustomError exception in a Ruby C extension and
> raise it:
>=20
> VALUE class_standard_error =3D rb_const_get(rb_cObject,
> rb_intern("StandardError")); VALUE class_custom_error =3D
> rb_define_class_under(class_standard_error, "ClassError", rb_cObject);
> rb_raise(class_custom_error, "Oh, a custom error occurred !!!");
>=20
> Unfortunatelly when running it I get:
>=20
> 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
>=20
> Being "my_function" the Ruby method calling to the above C code.
>=20
> I suspect that the line:
> rb_raise(class_custom_error, "Oh, a custom error occurred !!!");
> is not correct. How should look the first argument?
>=20
> Thanks a lot.

By inspecting the API I've realized that first argument must be an=20
instance/object of the class:

=E2=80=93 rb_raise(VALUE exception_object, const char* format_string, ...)

So I must use "rb_class_new_instance", am I right?



=2D-=20
I=C3=B1aki Baz Castillo <>

El Jueves, 22 de Octubre de 2009, I=C3=B1aki Baz Castillo escribi=C3=B3:
> Hi, I'm trying to create a CustomError exception in a Ruby C extension and
> raise it:
>=20
> VALUE class_standard_error =3D rb_const_get(rb_cObject,
> rb_intern("StandardError")); VALUE class_custom_error =3D
> rb_define_class_under(class_standard_error, "ClassError", rb_cObject);
> rb_raise(class_custom_error, "Oh, a custom error occurred !!!");

Ops, this is wrong as ClassError should be a child of StandardError rather=
=20
than a be under it.


=2D-=20
I=C3=B1aki Baz Castillo <>

El Jueves, 22 de Octubre de 2009, I=C3=B1aki Baz Castillo escribi=C3=B3:
> Hi, I'm trying to create a CustomError exception in a Ruby C extension and
> raise it:
>=20
> VALUE class_standard_error =3D rb_const_get(rb_cObject,
> rb_intern("StandardError")); VALUE class_custom_error =3D
> rb_define_class_under(class_standard_error, "ClassError", rb_cObject);
> rb_raise(class_custom_error, "Oh, a custom error occurred !!!");
>=20
> Unfortunatelly when running it I get:
>=20
> 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
>=20
> Being "my_function" the Ruby method calling to the above C code.
>=20
> 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 =3D rb_const_get(rb_cObject, rb_intern("Standar=
dError"));
VALUE argv[0];
VALUE new_error =3D 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.

=2D-=20
I=C3=B1aki Baz Castillo <>

El Jueves, 22 de Octubre de 2009, I=C3=B1aki Baz Castillo escribi=C3=B3:
> El Jueves, 22 de Octubre de 2009, I=C3=B1aki Baz Castillo escribi=C3=B3:
> > Hi, I'm trying to create a CustomError exception in a Ruby C extension
> > and raise it:
> >
> > VALUE class_standard_error =3D rb_const_get(rb_cObject,
> > rb_intern("StandardError")); VALUE class_custom_error =3D
> > 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?
>=20
> Let's try the following real code:
>=20
> VALUE class_standard_error =3D rb_const_get(rb_cObject,
> rb_intern("StandardError")); VALUE argv[0];
> VALUE new_error =3D rb_class_new_instance(0, argv, class_standard_error);
> rb_raise(new_error, "Oh an error ocurred !!!");
>=20
> When calling the function containing it from Ruby I get:
>=20
> NoMethodError: undefined method `new' for #<StandardError: StandardErro=
r>
>=20
> What am I doing wrong?

Definitively the line
rb_raise(new_error, "Oh an error ocurred !!!");
is wrong. I think that "VALUE exception_object" (as the function requires a=
s=20
first argument) cannot be a class instance.

API:
rb_raise(VALUE exception_object, const char* format_string, ...)

=2D-=20
I=C3=B1aki Baz Castillo <>

On Thu, Oct 22, 2009 at 3:55 PM, I=C3=B1aki Baz Castillo <> wr=
ote:
> =C2=A0 =C2=A0 =C2=A0 =C2=A0VALUE class_standard_error =3D rb_const_get(rb=
_cObject, rb_intern("StandardError"));
> =C2=A0 =C2=A0 =C2=A0 =C2=A0VALUE argv[0];
> =C2=A0 =C2=A0 =C2=A0 =C2=A0VALUE new_error =3D rb_class_new_instance(0, a=
rgv, class_standard_error);
> =C2=A0 =C2=A0 =C2=A0 =C2=A0rb_raise(new_error, "Oh an error ocurred !!!")=
;
>

why not simple:

VALUE custom_error =3D rb_define_class("CustomError", rb_eStandardError);
rb_raise(custom_error, "An error occured!");

El Jueves, 22 de Octubre de 2009, Nikolai Lugovoi escribi=C3=B3:
> On Thu, Oct 22, 2009 at 3:55 PM, I=C3=B1aki Baz Castillo <> =
wrote:
> > VALUE class_standard_error =3D rb_const_get(rb_cObject,
> > rb_intern("StandardError")); VALUE argv[0];
> > VALUE new_error =3D rb_class_new_instance(0, argv,
> > class_standard_error); rb_raise(new_error, "Oh an error ocurred !!!");
>=20
> why not simple:
>=20
> VALUE custom_error =3D rb_define_class("CustomError", rb_eStandardError);
> rb_raise(custom_error, "An error occured!");

Thanks, I've realized right now that first parameter in "rb_raise" can be=20
"VALUE class".

Let me try

Really thanks a lot.

=2D-=20
I=C3=B1aki Baz Castillo <>

El Jueves, 22 de Octubre de 2009, I=C3=B1aki Baz Castillo escribi=C3=B3:
> El Jueves, 22 de Octubre de 2009, Nikolai Lugovoi escribi=C3=B3:
> > On Thu, Oct 22, 2009 at 3:55 PM, I=C3=B1aki Baz Castillo <=
> wrote:
> > > VALUE class_standard_error =3D rb_const_get(rb_cObject,
> > > rb_intern("StandardError")); VALUE argv[0];
> > > VALUE new_error =3D rb_class_new_instance(0, argv,
> > > class_standard_error); rb_raise(new_error, "Oh an error ocurred !!!");
> >
> > why not simple:
> >
> > VALUE custom_error =3D rb_define_class("CustomError", rb_eStandardError=
);
> > rb_raise(custom_error, "An error occured!");
>=20
> Thanks, I've realized right now that first parameter in "rb_raise" can be
> "VALUE class".
>=20
> Let me try
>=20
> Really thanks a lot.
>

Done thanks to you:

VALUE class_xdms_error =3D rb_define_class("XDMSError", rb_eStandardError);
VALUE class_xdms_url_parsing_error =3D rb_define_class("XDMSURLParsingErro=
r",=20
class_xdms_error);
rb_raise(class_xdms_url_parsing_error, "An error occured!");




=2D-=20
I=C3=B1aki Baz Castillo <>