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Questions tagged [ruby-ffi]

Ruby-FFI is a ruby extension for programmatically loading dynamic libraries, binding functions within them, and calling those functions from Ruby code.

Ruby-FFI is a ruby extension for programmatically loading dynamic libraries, binding functions within them, and calling those functions from Ruby code. It works without changes on Ruby and JRuby.

31 questions
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How can I load Windows DLL files with Ruby fiddle?

I am trying to create a GR framework binding for ruby. I use Fiddle. Fiddle is a default extension to translate a foreign function interface (FFI) with ruby. It Works well on Linux and Mac. But on Windows, I got following error. code…
kojix2
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ruby ffi call function referenced by pointer in struct?

I'm trying to use libfluidsynth with ruby ffi and need to iterate over a soundfont to get all instruments. Specifically, the _fluid_sfont_t struct has iteration_start and iteration_next references that I need to…
eagspoo
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Can I pass a ruby object pointer to a ruby-ffi callback?

I could really use a push in the right direction on this. Given this C code: typedef void cbfunc(void *data); void set_callback(cbfunc* cb); //do_stuff calls the callback multiple times with data as argument void do_stuff(void *data); This Ruby…
Daniel Wyatt
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Assigning to nested struct members in Ruby FFI

Consider the following two FFI structs: class A < FFI::Struct layout :data, :int end class B < FFI::Struct layout :nested, A end To instantiate them: a = A.new b = B.new Now when I try to assign a to b.nested like this: b[:nested] = a I get the…
G S
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How to pass a struct with a string field to a native library, with pre-initialized string field of that struct, via FFI?

I have ruby code which passes a struct to a native Rust library, via FFI gem. A struct contains a string field. I need to be able to specify string on Ruby side. class MyStruct < FFI::Struct layout :s1, :string, :field2,…
Korasatavvaku
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Rust Vec to Ruby Array with FFI Segfaults

I am trying to return a struct that can be converted into a Ruby array from an external rust function but when I try to call the structs #to_a method I get a segfault. use libc::size_t; #[repr(C)] pub struct Array { len: libc::size_t, data:…
mpiccolo
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Error compiling the tesseract-ocr gem with ruby ffi-inliner

When I try and run the following code, require 'rubygems' require 'bundler/setup' Bundler.require(:default) I get the errors below $ bundle exec ruby test.rb…
Cameron Walsh
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Ruby Fiddle - Function behaves differently between C and Ruby

I am using Ruby Fiddle to access a C function to perform some heavy calculations. The C function works perfectly well when called directly, but when used via Fiddle it returns various rows of nans and infs in an unpredictable way. The function…
Rojj
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Why is my Fiddle struct being filled with garbage?

I'm attempting to convert a very simple C Win32 API call over to Ruby utilizing Fiddle and I'm not having much success. The first two method calls work flawlessly, though when I get to the call which populates a struct I'm having a bit of…
cjones26
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How do I use the ruby ffi gem to call a freestanding function in a rust library?

ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-linux] rustc 0.13.0-nightly (f168c12c5 2014-10-25 20:57:10 +0000) I want to use the ffi gem in conjunction with rust. I have read this (quite outdated) blog post, which shows how to do that. The…
le_me
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Why does gem not auto compile my C extension

I build a Ruby gem, which needs some C extension. This one - once compiled - is bound via Ruby FFI into the gem. My setup: I use bundle for the gem scaffolding. Inside my gems folder I have a subfolder ext. This one includes a static Makefile,…
GeorgieF
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Declaring char array in Ruby FFI

I have the following C code: typedef void (*mycallback) (char buf[128]); void take_callback(mycallback cb) { } I've written the equivalent Ruby FFI declarations as below (following advice for structs on FFI wiki): callback :mycallback, [[:char,…
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GENERAL_NAME_free error when using Aerospike from Ruby

I am trying to create a simple shared library libfoo.so which opens a connection to Aerospike server using a single function, waits for 3 seconds and closes the connection. libfoo.so has a single function open_then_close(char* host, int port). Then…
fade2black
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Is it possible to make a function attached with ruby ffi private?

I have a share object lib that I attach functions from, using ruby ffi. I want to attach each function with an alias and make the alias' private, because calling them can be dangerous. I am wrapping each function in their own ruby module function,…
Rostepher
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How to bring methods from a module into the scope of the caller of a method in ruby?

The code should look like this: def bring_into_scope(module) #here the caller of the method should get methods from +module+ end class Bar def bar_method #do stuff end end class Foo def initialize(bar) bring_into_scope(bar) …
le_me
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