[Ironruby-core] WinForms event handling

Andrew S. Townley ast at atownley.org
Tue Apr 21 13:08:07 EDT 2009


I was doing a bit of experimenting with ironruby today to see if it
might be useful for some prototyping work that I'm doing.  I noticed
that any of the strings returned from the CLR don't automatically
include the ruby string methods.  I would've expected that these would
be mapped directly so that you could call @textfield.text.strip instead
of @textfield.text.trim.

Probably low on the priority list, but was just curious what the plan
was.  Assignment to locally created string references doesn't help
either.  I know it's early days yet, but this sort of thing will make it
difficult for people to remember which API applies where--especially if
CLR strings "escape" a particular method context.

Interesting things seem to also happen if you try and create a CLR type

C:\>ir -v
IronRuby 0.3 on .NET

irb(main):001:0> require 'mscorlib'
=> true
irb(main):002:0> s = System::String.new "fubar"
TypeError: can't convert String into System::Char*
        from (irb):0
        from :0:in `eval'
        from workspace.rb:80:in `evaluate'
        from context.rb:217:in `evaluate'
        from irb.rb:147:in `eval_input'
        from irb.rb:253:in `signal_status'
        from irb.rb:146:in `eval_input'
        from ruby-lex.rb:230:in `each_top_level_statement'
        from :0:in `loop'
        from ruby-lex.rb:229:in `each_top_level_statement'
        from :0:in `catch'
        from ruby-lex.rb:227:in `each_top_level_statement'
        from irb.rb:102:in `eval_input'
        from irb.rb:69:in `start'
        from :0:in `catch'
        from irb.rb:51:in `start'
        from iirb:0irb(main):003:0>

The only way that I've found to ensure that it's really a Ruby string is
to do something like this

s = "" << clrstring

Has anyone else hit this yet?


Andrew S. Townley <ast at atownley.org>

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