`rescue in block in dlload': can't load D:/Ruby25/lib/ruby/gems/2.5.0/gems/libui-0.0.8/vendor/libui.dll (Fiddle::DLError) about libui

[kematy]

in msys2, pacman -Syu update system
pacman -S mingw-w64-i686-libffi

then in cmd :gem install fiddle
irb(main):001:0> require 'fiddle'
=> false
irb(main):002:0> p Fiddle::VERSION
"1.0.8"
=> "1.0.8"

then

D:/Ruby25/lib/ruby/gems/2.5.0/gems/fiddle-1.0.8/lib/fiddle.rb:67: warning: already initialized constant Fiddle::RTLD_GLOBAL
D:/Ruby25/lib/ruby/2.5.0/fiddle.rb:53: warning: previous definition of RTLD_GLOBAL was here
D:/Ruby25/lib/ruby/gems/2.5.0/gems/fiddle-1.0.8/lib/fiddle.rb:68: warning: already initialized constant Fiddle::RTLD_LAZY
D:/Ruby25/lib/ruby/2.5.0/fiddle.rb:54: warning: previous definition of RTLD_LAZY was here
D:/Ruby25/lib/ruby/gems/2.5.0/gems/fiddle-1.0.8/lib/fiddle.rb:69: warning: already initialized constant Fiddle::RTLD_NOW
D:/Ruby25/lib/ruby/2.5.0/fiddle.rb:55: warning: previous definition of RTLD_NOW was here
D:/Ruby25/lib/ruby/gems/2.5.0/gems/fiddle-1.0.8/lib/fiddle.rb:61:in initialize': Exec format error (Fiddle::DLError) from D:/Ruby25/lib/ruby/gems/2.5.0/gems/fiddle-1.0.8/lib/fiddle.rb:61:in new'
from D:/Ruby25/lib/ruby/gems/2.5.0/gems/fiddle-1.0.8/lib/fiddle.rb:61:in dlopen' from D:/Ruby25/lib/ruby/gems/2.5.0/gems/fiddle-1.0.8/lib/fiddle/import.rb:86:in block in dlload'
from D:/Ruby25/lib/ruby/gems/2.5.0/gems/fiddle-1.0.8/lib/fiddle/import.rb:77:in collect' from D:/Ruby25/lib/ruby/gems/2.5.0/gems/fiddle-1.0.8/lib/fiddle/import.rb:77:in dlload'
from D:/Ruby25/lib/ruby/gems/2.5.0/gems/libui-0.0.8/lib/libui/ffi.rb:78:in <module:FFI>' from D:/Ruby25/lib/ruby/gems/2.5.0/gems/libui-0.0.8/lib/libui/ffi.rb:74:in module:LibUI'
from D:/Ruby25/lib/ruby/gems/2.5.0/gems/libui-0.0.8/lib/libui/ffi.rb:73:in <top (required)>' from D:/Ruby25/lib/ruby/gems/2.5.0/gems/libui-0.0.8/lib/libui.rb:28:in require_relative'
from D:/Ruby25/lib/ruby/gems/2.5.0/gems/libui-0.0.8/lib/libui.rb:28:in <module:LibUI>' from D:/Ruby25/lib/ruby/gems/2.5.0/gems/libui-0.0.8/lib/libui.rb:6:in <top (required)>'
from D:/Ruby25/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in require' from D:/Ruby25/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in rescue in require'
from D:/Ruby25/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:39:in require' from D:/ruby-lab/guis/libui.rb:1:in

'

[kojix2]

At first glance, it may be a Fiddle problem.

1. Can you call Fiddle?

require 'fiddle'

2. If it does, what version of Fiddle do you have?

require 'fiddle'
p Fiddle::VERSION

The VERSION constant was added recently, so it may not exist. It means that it is prior to 1.0.0.

[kojix2]

How did you install Ruby on Windows?
RubyInstaller?

[kematy]

I install ruby with RubyInstaller.
irb(main):001:0> require 'fiddle'
=> false
gem install fiddle
Fetching: fiddle-1.0.8.gem (100%)
Temporarily enhancing PATH for MSYS/MINGW...
Installing required msys2 packages: mingw-w64-i686-libffi
错误：无法打开文件 /var/lib/pacman/local/mingw-w64-i686-gnutls-3.6.13-2/desc: No such file or directory
Building native extensions. This could take a while...

[kojix2]

Thanks.

Sorry, It doesn't seem to be a fiddle problem.
It seems that libui.dll cannot be loaded. LibUI problem.

First, we need to find out if libui.dll exists.

/Ruby25/lib/ruby/gems/2.5.0/gems/libui-0.0.8/vendor/libui.dll

Check the file size and make sure the file is not corrupt.

[kematy]

Only ofr 64 bit Ruby?

[kojix2]

Only the 64bit version is packed in the Gem. (´-ω-`)
Other versions are distributed on the libui site.
If you replace it, it might work.

https://github.com/andlabs/libui/releases/tag/alpha4.1

[kematy]

Thank you

[kojix2]

Now I can reproduce the issue.

Ruby	libui.dll	work?
Ruby+Devkit 2.5.9-1 (x86)	libui-alpha4.1-windows-amd64-shared.zip	Not work
Ruby+Devkit 2.5.9-1 (x86)	libui-alpha4.1-windows-386-shared.zip	OK

Thank you for your report.
If there are no further problems, please close it.

[kojix2]

Updates
Added a task to the Rakefile to download the 32-bit libui shared library.

rake vendor:all_x64      # Download libui.so, libui.dylib, and libui.dll to...
rake vendor:linux_x64    # Download libui.so for Linux to vendor directory
rake vendor:linux_x86    # Download libui.so for Linux to vendor directory
rake vendor:mac_x64      # Download libui.dylib for Mac to vendor directory
rake vendor:windows_x64  # Download libui.dll for Windows to vendor directory
rake vendor:windows_x86  # Download libui.dll for Windows to vendor directory

So, you can install it as follows

rake vendor:windows_x86
rake install

[rubyFeedback]

Oddly enough I re-installed the Win10 laptop and I ran into the exact same issue.

The strange thing is that prior to the re-installation, that issue did not happen.

Right now I am a bit confused how this error shows up. I don't recall what I did
different prior to the reinstall; always installed via "gem install libui".

Note that require 'fiddle' and Fiddle::VERSION works. But require 'libui' fails
with a "No such file or directory" Fiddle::DLError.

Is there some path issue perhaps? I can start "irb" from cmd.exe just fine
and "ruby -v" shows the most recent ruby version (which is ruby 3.0.3).

[kojix2]

@rubyFeedback
Please tell us a little more about your environment.
Did you use RubyInstaller to install Ruby, and is Ruby really a 64-bit version?
Obviously using a 32bit version of Ruby will cause problems, but other causes are less clear and need to be investigated.

[kojix2]

One way to tell 64bit Ruby from 32bit Ruby is to use
ruby -e "puts 1.size"

If it is 4, it is 32-bit, and if it is 8, it is 64-bit.