larskanis/libusb

uninitialized constant LIBUSB::Call::FFI (NameError)

pioz opened this issue · 5 comments

pioz commented

Hi, I have this problem under osx lion:
I've installed ffi and libusb gem:

port install libusb
gem install ffi
gem install libusb

When I run this code

require 'libusb'

I've this error:

/Users/pioz/.rvm/gems/ruby-1.9.3-p0/gems/libusb-0.1.3/lib/libusb.rb:24:in `<module:Call>': uninitialized constant LIBUSB::Call::FFI (NameError)
from /Users/pioz/.rvm/gems/ruby-1.9.3-p0/gems/libusb-0.1.3/lib/libusb.rb:23:in `<module:LIBUSB>'
from /Users/pioz/.rvm/gems/ruby-1.9.3-p0/gems/libusb-0.1.3/lib/libusb.rb:20:in `<top (required)>'
from /Users/pioz/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:59:in `require'
from /Users/pioz/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:59:in `rescue in require'
from /Users/pioz/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:35:in `require'
from main.rb:1:in `<main>'

Ruby version 1.9.3, libusb version 1.0.9, libusb gem version 0.1.3, ffi gem version 1.0.11.

Any idea?

larskanis commented

Currently no idea. It seems that ffi isn't installed/loaded correctly. You may try

gem install ffi --pre

or do a

gem 'ffi'
require 'libusb'

to ensure, that require 'ffi' does not load some wrong file.

pioz commented

Ok, with ffi --pre (v1.1.0.rc4) I've another error:

/Users/pioz/.rvm/gems/ruby-1.9.3-p0/gems/ffi-1.1.0.rc4/lib/ffi/library.rb:121:in `block in ffi_lib': Could not open library 'libusb-1.0': dlopen(libusb-1.0, 5): image not found. (LoadError)
Could not open library 'libusb-1.0.dylib': dlopen(libusb-1.0.dylib, 5): image not found
from /Users/pioz/.rvm/gems/ruby-1.9.3-p0/gems/ffi-1.1.0.rc4/lib/ffi/library.rb:88:in `map'
from /Users/pioz/.rvm/gems/ruby-1.9.3-p0/gems/ffi-1.1.0.rc4/lib/ffi/library.rb:88:in `ffi_lib'
from /Users/pioz/.rvm/gems/ruby-1.9.3-p0/gems/libusb-0.1.3/lib/libusb.rb:29:in `<module:Call>'
from /Users/pioz/.rvm/gems/ruby-1.9.3-p0/gems/libusb-0.1.3/lib/libusb.rb:23:in `<module:LIBUSB>'
from /Users/pioz/.rvm/gems/ruby-1.9.3-p0/gems/libusb-0.1.3/lib/libusb.rb:20:in `<top (required)>'
from /Users/pioz/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:59:in `require'
from /Users/pioz/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:59:in `rescue in require'
from /Users/pioz/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:35:in `require'

I've install libusb with sudo port install libusb.

$ port list | grep libusb
libusb                         @1.0.9          devel/libusb
libusb-compat                  @0.1.4          devel/libusb-compat
libusb-devel                   @1.0.8.20101017 devel/libusb-devel
libusb-legacy                  @0.1.12         devel/libusb-legacy
larskanis commented

I'm not that familar with OSX. But you need to have libusb installed:

port installed | grep libusb
  libusb @1.0.9_0 (active)

Then there should be a file /opt/local/lib/libusb-1.0.dylib. To ensure that the libusb library file can be found, you could use:

export LD_LIBRARY_PATH=/opt/local/lib
larskanis commented

@pioz : Is your issue to libusb solved, now? I would like to close it, if so.

dmcinnes commented

In any case installing libusb through homebrew seemed to solve the issue for me :)