Getting variable form IronRuby

Ruby IronRuby
1

I’m using IronRuby 1.1.3 and .Net 4.

In IronRuby I’ve got two files:

  1. Module.rb

This file contains a class with static method GetObjectHash. The idea

is to parse the object find all it’s properties and make a hash like:
{property_name => [property_type, property_value], …}

  1. Main.rb

This file creates several objects from different classes and calls

GetObjectHash method.

Then I try to execute Main.rb using C#:

string path = “…/…/RubyTest.rb”;
var runtime = IronRuby.Ruby.CreateRuntime();
var engine = runtime.GetEngine(“rb”);
engine.ExecuteFile(path);

Ok, it executes. And if in Main.rb I write the last command as

hashString = ModuleClass.GetObjectHash(testObject).to_s
print hashString

it prints into the console the hash I want to see. But. I’d like not to
use the last “print” command, and get the hashString variable into C#
where I can use it as normal string.

I tried to do that like:

dynamic netString;
engine.ExecuteFile(path).TryGetVariable(“hashString”, out netString);
string hash = netString as String;
Console.WriteLine(hash);

But hashString remained null. (Variable name is ok, I checked it).

Am I doing something wrong? How can I get “hashString” with stored data
into C#?

2

Hi Alexander,

did you try to convert the strings in the hash (which are a special type
of string called mutablestring) to a System::String.

I usually use:

a = “This is A String”
print a.class # => String
print a.to_clr_string # => System::String (which is the standard .net
string type)

I would use:
hashString = ModuleClass.GetObjectHash(testObject).to_s.to_clr_string

(now hashString is a Standard C# string)

Alexander R. wrote in post #1070241:

I’m using IronRuby 1.1.3 and .Net 4.

In IronRuby I’ve got two files:

  1. Module.rb

This file contains a class with static method GetObjectHash. The idea

is to parse the object find all it’s properties and make a hash like:
{property_name => [property_type, property_value], …}

  1. Main.rb

This file creates several objects from different classes and calls

GetObjectHash method.

Then I try to execute Main.rb using C#:

string path = “…/…/RubyTest.rb”;
var runtime = IronRuby.Ruby.CreateRuntime();
var engine = runtime.GetEngine(“rb”);
engine.ExecuteFile(path);

Ok, it executes. And if in Main.rb I write the last command as

hashString = ModuleClass.GetObjectHash(testObject).to_s

print hashString

it prints into the console the hash I want to see. But. I’d like not to
use the last “print” command, and get the hashString variable into C#
where I can use it as normal string.

I tried to do that like:

dynamic netString;
engine.ExecuteFile(path).TryGetVariable(“hashString”, out netString);
string hash = netString as String;
Console.WriteLine(hash);

But hashString remained null. (Variable name is ok, I checked it).

Am I doing something wrong? How can I get “hashString” with stored data
into C#?

3

Thanks for your answer, Eduardo.

I’ve done it as you adviced:

hashString = ModuleClass.GetObjectHash(testObject).to_s.to_clr_string

in IronRuby code

and tried to call it in C#:

string netString;
engine.ExecuteFile(path).TryGetVariable(“hashString”, out netString);
Console.WriteLine(netString);

Well, there are no mistakes in compiling Ruby code, but the netString is
null after executing the ruby file.

I guess that the hashString after executing just seems to be empty. Is
it something wrong with calling it in C# or is it just expected to be
so?

4

Why not use the ModuleClass directly from C#?

For example, if your ruby file looks like that:

class ModuleClass def getObjectHash(hashString) return
hashString.to_s.to_clr_string endend

Then in C# you’ll use it as follows:

var engine = IronRuby.Ruby.CreateEngine(); var scope =
engine.ExecuteFile(“module_class.rb”);
dynamic globals = scope.Engine.Runtime.Globals;dynamic module =
globals.ModuleClass.@new();string s = module.getObjectHash(“yo
yo”);Console.WriteLine(s ?? “NULL”);

Shay.

Shay F. | CodeValue http://codevalue.net/ Co-Founder, Dynamic
Languages and Web Technologies Expert | Microsoft Visual C# MVP | Author
of
IronRuby Unleashed
Email: [email protected] | Blog:
http://IronShay.comhttp://ironshay.com/ |
Twitter: http://twitter.com/ironshay