require 'dl' doesn't work

[Liz Huang]

In Ruby 1.8.7 and Rails 2.3.18, I used Dl.dlopen to load intel fortran dll like the following

require 'dl'
...

      sspath = Pathname.new( ".../lib/libsamplesize.dylib" )
      ss = DL.dlopen( sspath )
      samplesize = ss[ "samplesize_", "iiddS" ]
      session[:n], args = samplesize[ session[:nmax], session[:delta],
                          session[:conf], session[:errmsg] ]

but I got error message at line

require 'dl'

This error occurred while loading the following files:
   dl

Thanks!
Liz

[Liz Huang]

I am using Ruby 2.1.0 and Rails 4.1.2 now, and 'dl' no longer works?

Liz

[Joel Pearson]

That's a very short error message. What did the rest of the error say?

--
Posted via http://www.ruby-forum.com/.

[Liz Huang]

I don't see anything else though, let me copy the whole page:

LoadError in SamplesizeController#compute

cannot load such file -- dl

Extracted source (around line #14):

12 13 14 15 16 17

def compute require 'dl' require 'pathname' # if ( session[:sigma_sq] <= 0.0 )

Rails.root: /Library/WebServer/smart

Application Trace | Framework Trace | Full Trace

app/controllers/samplesize_controller.rb:14:in `compute'

This error occurred while loading the following files:
   dl

Request

Parameters:

None

[Matt Jones]

On Monday, 14 July 2014 15:49:51 UTC-4, Liz Huang wrote:

I don't see anything else though, let me copy the whole page:

LoadError in SamplesizeController#compute

cannot load such file -- dl

Extracted source (around line #14):

12 13 14 15 16 17

def compute require 'dl' require 'pathname' # if ( session[:sigma_sq] <= 0.0 )

Rails.root: /Library/WebServer/smart

Application Trace | Framework Trace | Full Trace

app/controllers/samplesize_controller.rb:14:in `compute'

This error occurred while loading the following files:
   dl

DL was deprecated in Ruby 2.0 and removed in 2.1 in favor of Fiddle. Fiddle docs:

http://ruby-doc.org/stdlib-2.0.0/libdoc/fiddle/rdoc/Fiddle.html

--Matt Jones 

[Liz Huang]

Thanks! I will check fiddle out and post if I have any questions. It can call .dylib?

Liz

[Liz Huang]

Dear Matt:

I have tried fiddle, but couldn't make it to import functions in .dylib (Fortran dll generated by intel
fortran compiler) that I could use DL to import successfully before.  Any suggestions?

Thanks!
Liz

[Liz Huang]

Does fiddle work in Mac? I saw some comment that it doesn't work in all platforms.

Liying