A foreign function interface (FFI) is a mechanism for one language to interact with software written in another language.
Questions tagged [ffi]
1778 questions
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How should dynamic, system-level libraries be bundled into a Rust crate?
When creating a wrapper around a (C) library libfoo that is either itself commonly dynamically linked or links some dependencies dynamically, should the crate libfoo-sys include this library and its dependencies in some way? If so, how?
In case…
Jan Hettenkofer
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How to specify to pyo3 the virtualenv to use in a rust project?
I need port some python code in my rust project (calling python from rust).
I am writing an app in rust that in a small part needs to import a module written in python.
This is my project…
al3x
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How to use USB interface of R307 fingerprint module?
I want to use the R307 fingerprint module using USB Protocol. I found an SDK for it that included a dll file. Now I want to use NodeJS to call the dll functions. So, I used node ffi module to call native dll functions.
DLL file link:…
Gnanavel
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Question about Implementing drop on an FFI library and preventing undefined behavior
I am trying to build a rust wrapper around a c library. For the structs in this library there are generally two functions for memory management, one for allocation and another for deallocation.
Now I plan to use the allocation code in the…
Brandon Piña
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2 answers
dart:ffi library ERROR: Unused import: 'package:ffi/ffi.dart' while trying to use allocate() and free() methods
I am trying to make an app that captures image (and doesnt display the camera stream) using dart:ffi (.c file is not included in code below). (I used this page) I use allocate() and free() methods, but I get an error: "The method 'free' ('allocate')…
Ozdek
- 3
- 3
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2 answers
bundle install fails due to ff1 gem even if gem install ffi is successful
Steps I did
Installed rbenv - Installation successful
rbenv install 3.1.2
Installed bundler gem - Successfull
gem install bundler
ran the bundle install command - Failed
bundle install
Output:
Fetching gem metadata from…
sudheeshcm
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1 answer
Dart - Bitshift for Uint
Try bitshifting for a Uint32 in Dart. How to handle this, if there is no support from dart:ffi?
import 'dart:ffi';
Uint32 len = 0 as Uint32;
len >>= 1; // will not be compiled
Try it with "normal" int. But i am afraid, will the result be…
0
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1 answer
how to translate from regular contructor in C++ to pImpl
I am working with this CXX rust example code
https://github.com/dtolnay/cxx/blob/master/demo/src/main.rs
// Toy implementation of an in-memory blobstore.
//
// In reality the implementation of BlobstoreClient could be a large complex C++
//…
Erik
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Can't build multiple binaries with Cargo linking to the same code using ffi
I have a Fortran library that I want to call from Rust, so I used ISO_C_BINDING to expose them to Rust. I got it to work nicely as a CLI application. But now I also want to expose it as a webapi (I chose https://rocket.rs). However when I try to…
suvayu
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Using C++ dll file need to convert jpg into Webp using nodejs
I've searched stackoverflow and numerous websites for an answer to this. But I can't find any proper information regarding this. I am stuck.
I want to convert jpg into Webp by Using C++ dll file in nodejs. For this i Installed FFi Also, But getting…
amit joshi
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- 4
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0 answers
How to pass an opaque data-type from a private module in an external Rust crate to FFI?
I am building the back-end of an iOS crypto wallet app using FFI bridge between flutter and rust. In doing so, I am required to mirror the external types onto the rust input file, or api.rs when following the flutter_rust_bridge official. Here is…
kenta_desu
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Getting error While installing FFI in NodeJS
I am trying to install ffi but I am getting an error. I have installed all the dependencies i.e. python and windows build tools before installing ffi.
Below is the complete error that I am getting:
npm WARN deprecated tar@2.2.2: This version of tar…
amit joshi
- 39
- 4
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0 answers
Need to Access Dll File through Nodejs, But getting Error
I am trying to call DLL functions through node.js by using FFI to get some return values.
npm i ffi
But not able to install ffi, Getting Error
npm ERR! command failed
npm ERR! command C:\Windows\system32\cmd.exe /d /s /c node-gyp rebuild
npm ERR!…
amit joshi
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- 4
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0 answers
EnumDisplayDevicesA not returning attached display if screen is duplicated?
I am trying to write a program in node.js which, via ffi, would interact with the Windows API to disconnect all external displays. Here is the code.
function DisplayDevices() {
var i = 0;
const display_device = new DISPLAY_DEVICE();
const…
Spartan 117
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1 answer
How to Link Lib.a in IOS, static as well as dynamic linking?
I have some open source c++ library , I have converted into lib.a for different IOS architecture, how can I link this library in Xcode For IOS Devices.
http://wiki.zeromq.org/build:iphone
Reference Link
The Main Target is to first test this in IOS…
wajahat akram
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