Creating and raising custom exception in Ruby C extension

[Iñaki Baz Castillo]

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 <[email protected]>

 

[Iñaki 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 <[email protected]>

 

[Iñaki 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 <[email protected]>

 

[Iñaki 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 <[email protected]>

 

[Iñaki 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 <[email protected]>

 

[Nikolai Lugovoi]

=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!");

 

[Iñaki Baz Castillo]

El Jueves, 22 de Octubre de 2009, Nikolai Lugovoi escribi=C3=B3:

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 <[email protected]>

 

[Iñaki 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:

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 <[email protected]>