From: Rob Ram <numeric@...>
Date: 2008-12-26T17:48:56+09:00
Subject: Re: Calling Ruby from Delphi

Huw Collingbourne wrote:
> You can connect Delphi Prism (Chrome/Oxgene) or C# or some other .NET 
> language with the Ruby interpreter using our free component, The Ruby 
> Connector. I haven't used Delphi 2009 (does that still have a .NET 
> version?) so can't comment specifically on that. The Ruby Connector 
> comes with a comprehensive manual and lots of sample code...
> 
> http://www.sapphiresteel.com/SapphireSteel-Downloads
> 
> best wishes
> Huw Collingbourne
> 
> SapphireSteel Software
> http://www.sapphiresteel.com

Thank you for your reply.

I was successful calling Ruby from Delphi 2009. I used the Delphi API 
found at: http://sourcepole.ch/2006/9/1/embedding-ruby-in-kylix-delphi . 
This was originally written for Delphi 2006. However it will work with 
Delphi 2009 with minor modifications. Delphi 2009 now supports Unicode 
strings and user code strings must be re-cast to 
ansiString/pAnsiString/ansiChar/pAnsiChar to be compatible with Ruby 
strings.
Delphi 2009 is intended for native Windows development. There are other 
versions of Delphi available for .net support.

The source code, “rubycomp-0.8-src.tar.gz”, provides a Delphi component 
for easy evaluation. In my case however, I did not want to re-direct the 
IO and removed the Ruby component. Otherwise, Ruby access is through 
msvcrt-ruby18.dll. The source code provides Delphi files to access the 
Ruby DLL. It’s basically ruby.h and other c++ files re-written for 
Delphi.

To call Ruby functions from Delphi (in simplified terms):

1. First initialize Ruby.

2. Then use rb_require function to load the Ruby file.

3. Calling the “rb_eval_string” can easily access any function within 
the Ruby file. For example:
rv := rb_eval_string(‘myFunction(a,b,c)’); // From the prior example.

4. Finally evaluate rv using:
    rtn := dl_Variant(rv); // where rtn is a variant array.

// multi-results from the prior example.
rv1 := rtn[0];
rv2 := rtn[1];
rv3 := rtn[2];

The dl_Variant function is found in uConv.pas (extracted from 
rubycomp-0.8-src.tar.gz).

There may be better methods to call a Ruby function from Delphi, but 
this does seem to work efficiently.
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