From: Robert Klemme <bob.news@...>
Date: 2003-12-15T19:01:58+09:00
Subject: Re: create/read/write structs in ruby


"Michael Hale" <michael@halefamilysite.com> schrieb im Newsbeitrag
news:542265F2-2CF8-11D8-BE7E-000A95C4BF56@halefamilysite.com...
> I am creating an extension in ruby for a library with a sizeable amount
> of sizeable structs.  I would like to be able to create c structs, set
> their attributes, and read their attributes in ruby, for the purpose of
> passing the struct I just setup to a native method that knows what to
> do with it.
>
> I am envisioning something like this:
>
> require 'customtype.so'
> t = CustomType.new
> #writer
> t.property1 = 'some value'
>
> #reader
> t.property1
>
> Under the covers this would read/write the values on my c struct.
> The only way I can see to implement this would be to basically write a
> c method for every attribute on the struct and then do some method
> missing stuff on the ruby side.
>
> Is there an easier/better way to read and write data from a struct in
> ruby than what I have outlined?

Depending on what you want to do it might be easier to use Struct and do
the conversion at a later moment.  An Example:

irb(main):007:0> Customer = Struct.new( "Customer", :name, :number )
=> Struct::Customer
irb(main):008:0> c1 = Customer.new
=> #<struct Struct::Customer name=nil, number=nil>
irb(main):009:0> c1.name = "foo"
=> "foo"
irb(main):010:0> c1.number = 123434
=> 123434
irb(main):011:0> c1
=> #<struct Struct::Customer name="foo", number=123434>
irb(main):012:0>

Kind regards

    robert