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Questions tagged [ffi]

A foreign function interface (FFI) is a mechanism for one language to interact with software written in another language.

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In Racket's FFI, how do you register a callback that takes a list?

I need to define a function in Racket's FFI that takes a callback: (define-ffi-definer define-lib (ffi-lib "libLib")) (define callback (_fun [len : _int] [elems : (_list i _int)] -> _void)) (define-lib registerCallback (_fun callback ->…
Nate
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Returning a dependent pair from a foreign function

I have the following Chez support file: (define list-copy-with-length (xs) (cons (length xs) (list-copy xs))) and I have this Idris file: %foreign "scheme,chez:list-copy-with-length" prim__listToVect : List t -> (Nat, Vect n t) listToVect : List…
shadowtalker
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Create a safe binding between C and Rust for non opaque datatypes passed as *void

I need to interface with a third party C library where I have a function like this: void setOption(const char* optionName, void* value) { if (strcmp(optionName, "OPTION_1") == 0) { gOption1 = (const uint_fast64_t) value; } else…
Ivan
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Pass 2D array of bytes to C in Rust

I've written a function in C with this signature: write_stuff(char **pages, uint32 page_count); pages will be an array of 128 elements, with each element either NULL or pointing to a char array of 8192 bytes. So, an array of arrays with fixed,…
ccleve
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`The Flutter SDK is not available` when running `dart run ffigen`

I'm trying to run dart run ffigen but I'm getting this error $ dart run ffigen The Flutter SDK is not available. #0 BoundSdkSource.getDirectory (package:pub/src/source/sdk.dart:125:7) #1 SystemCache.load…
noibe
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Request answers to questions found when calling Dll libraries using FFI-NAPI

I am confused。 When using FFI-NAPI - Dll 。 The return value does not receive anything。 But print out the content (stdut) at the terminal。 I will post part of the code below and keep trying. I guess it will work after using FF-callback, but I'm…
曾钰涵
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Bindgen: How to include all functions in some files but only certain functions in other files?

I have two folders that I want to create bindings for: Include: - I need everything in this folder Src: - I only need 3 functions (of many) from one file (of many) All of the required files are included in wrapper.h. I can create bindings for the…
Jambalaya
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Running 'npm install' on previously working Node.js project, now gives errors. (Possibly problem with 'ffi-napi' package or 'node-gyp' dependency)

I wrote a web app back in November 2020, and it was working perfectly fine then. But now when I download it, and try to install it via 'npm install' I get a ton of errors. The project is located here if anyone wants to try…
pintof
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How to declare argc, argv in ruby ffi, and how to pass proper values to it?

Answered: What is proper ruby ffi code for this function: void glutInit(int *argc, char ** argv); attach_function :glutInit, [:pointer, :pointer], :void Answered: How to handle array of C-strings? Like a pointer! Still unanswered:How to change…
przemo_li
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Binding a C++ virtual class for use in Python

I want to know a way of consuming the VST3 SDK from Python. In its essence, the VST3 architecture mimics COM. My end goal is using the GetPluginFactory exported by a VST3 plugin in Python. This function returns a pointer to a C++ virtual class. I am…
demberto
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Load a ctypes dlopen handle with cffi

I have this weird case where I absolutely need to open a library using ctypes._dlopen (intercepted method that use a weird memory layout) and then so I can use it in a more simpler way (with my header definitions) I need to load the handle (so the…
hube
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How to copy to clipboard w/o os api using lua and ffi

How do you copy a value or string in lua? I’ve only found alternatives for the regular microsoft os api. For my use I do not have access to the os api and instead have access to ffi and steam panorama. If possible I would also know how to get a…
Nepo
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Using `riscv64-unknown-elf-g++` to link rust static lib failed

I try to use riscv64-unknown-elf-g++ which is rv64imac architecture to compile C code with rust static lib. The simple example is https://github.com/zzhengzhuo/base_bin . When I use riscv64-unknown-elf-gcc, it works well. But when I use…
user18014250
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Is there a workaround for the fact that TypeId only works for 'static types?

I am giving C++ a Box containing a trait object, and then when I get that Box back from C++, I want to try to downcast it into a concrete type. However, I can't do it safely because the types I'm using are not (and cannot be) 'static, so…
laptou
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Rust FFI - Dangling pointer

I work on a Rust library used, through C headers, in a Swift UI. I can read from Swift in Rust, but I can't write right away to Swift (so from Rust) what I've just read. -- Basically, I get to convert successfully in String an *const i8 saying hello…
Ontokrat
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