Forum: IronRuby ironruby in VB.net and rubygems

Hi,
I've just encountered the following problem:
I've installed the gem "builder" in version 2.0 via igem and it works 
fine.
When using it in a script first the first 2 lines are:

    require 'rubygems'
    require 'builder'

In VB.net I execute ruby code in the following way:

I linked:

    IronRuby.dll
    IronRuby.Libraries.dll
    IronRuby.Lbraries.Yaml.dll

from InstallationDirectory\Silverlight\bin\

my code which works fine with "regular" ruby code:

    Sub Main(ByVal Args As String())
        Dim rubyRuntime As Microsoft.Scripting.Hosting.ScriptRuntime
        Dim rubyEngine As Microsoft.Scripting.Hosting.ScriptEngine

        rubyRuntime = IronRuby.Ruby.CreateRuntime
        rubyEngine = rubyRuntime.GetEngine("rb")

        Dim strRuby As String

        Dim fileReader As StreamReader
        fileReader = New 
StreamReader(System.Environment.CurrentDirectory &
"\" & Args(0))
        strRuby = fileReader.ReadToEnd
        fileReader.Close()
        fileReader = Nothing
        rubyEngine.Execute(strRuby)
    End Sub

Now, when I compile the code the libraries I linked are copied in my 
output
directory as usual. And here the problem starts. When this library
IronRuby.Libraries.dll is in the directory where my programm is running,
executing the "require 'rubygems'" throws an error. It's the same when I
start ir on the command line and type it in. When I delete this library 
the
ruby code runs without any problem, but the VB.net program won't execute
any more. Here's the error message:

    C:/Program Files/IronRuby 1.1/Lib/ironruby/thread.rb:16:in
`load_assembly': Specified type
IronRuby.StandardLibrary.Threading.ThreadingLibraryInitializer is not a
subclass of IronRuby.Builtins.LibraryInitializer (LoadError)
    from C:/Program Files/IronRuby 1.1/Lib/ironruby/thread.rb:16
    from C:/Program Files/IronRuby 1.1/Lib/ruby/1.9.1/rubygems.rb:16:in
`require'
    from C:/Program Files/IronRuby 1.1/Lib/ruby/1.9.1/rubygems.rb:16
    from (ir):1:in `require'
    from (ir):1

The versions I use:
IronRuby 1.1.3.0 on .NET 4.0.30319.239
MS Visual Studio 2010

I desperately hope for help as I couldn't any helping post in the 
archives!
thanks in advance
Andreas

Not sure if this is your problem, but off the top of my head I'll try 
help.

IronRuby needs to know the path to it's standard library directory. This 
is stored in the ir.exe.config file that ships along with IronRuby.
When you host IronRuby from inside another application, this config file 
isn't present.
Rubygems isn't one of the core libraries (those are implemented in 
IronRuby.Libraries.dll), and so when you try and require rubygems, it 
goes looking for the standard library, and fails.

Try open ir.exe.config from the IronRuby directory, and copy the parts 
which reference file paths over to your own app.exe.config (and remember 
to update the paths, etc).

It should look kind of like this (NOTE: this is an old config file and 
so it won't be correct for the latest version of ir):

http://code.google.com/p/efficientlylazycrypto/sou...

Orion