A foreign function interface (FFI) is a mechanism for one language to interact with software written in another language.
Questions tagged [ffi]
1778 questions
0
votes
1 answer
Dart FFI type mappings
I'm making a Dart library that uses FFI to interact with Rust code and I have some questions.
I couldn't find any official information about native interop behavior and I've been steering only by other examples and Dart SDK code.
For instance, Dart…
pak3nuh
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- 4
0
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0 answers
Is it possible to write into a Rust data pointer handed over from an external function call while accessing the data pointer from outside?
Let's assume we have a software module with a data structure in Rust, which can do a specific computation taking a list of numbers as input. We would like to access this module from outside, e.g. C++. As the computation is processed number-by-number…
Nevsden
- 99
- 6
0
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1 answer
PHP FFI possible on ARMv8?
I can load my library through the FFI on x86_64 but not on AArch64.
FFI::cdef(
/* ... */,
$root . './build/libuplink.so'
);
PHP Fatal error: Uncaught FFI\Exception: Failed loading '/home/linaro/uplink-php/build/libuplink.so' in…
Erik van Velzen
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- 3
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1 answer
How do I pass a non-mutable reference from Rust to a C-API that doesn't use const (even though it should)?
I have a wrapper around a C-API:
#[repr(transparent)]
pub struct Request(http_request_t);
This wrapper provides several methods for interacting with the request:
impl Request {
pub fn bytes_received(&self) -> usize {
unsafe {
…
dcoles
- 3,785
- 2
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0
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0 answers
Golang calling Windows DLL function with more than 18 arguments
I have an external 64 bit .DLL and I have to pass 22 arguments to one of the functions.
Go (go1.16.4 windows/amd64) allows up to 18 arguments. Is there any workaround?
Thanks
xc218m
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- 6
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0 answers
How to import jars by JNI-rs
I'm trying to use some dependencies in JNI-rs.
The following is the class which I need to use：
org.quartz public class JobDataMap
extends org.quartz.utils.StringKeyDirtyFlagMap
implements java.io.Serializable
Maven:…
slhmy
- 11
- 4
0
votes
1 answer
How use UEFI locate_protocol in a rust project with r_efi crate
In a cross-compiled educative project with rust and the crate r_efi and without the rust standard library, I wanna make a small program to UEFI systems. For the moment, the goal is to be able to use the graphical output protocol.
Through the use of…
ExecAssa
- 177
- 11
0
votes
0 answers
How to read a returned Rust dll pointer from Python
I want to return a f64 vector from Rust to Python and I'm not sure how to dereference the returned pointer in Python side.
lib.rs
use libc::c_double;
#[no_mangle]
pub extern "C" fn give_me_array() -> *const Vec {
let array_to_pass =…
mbfernan
- 13
- 5
0
votes
1 answer
Access elements of a static fixed size array from a DLL in another DLL in Rust
I'm compiling some information of an object into an .so, like:
#[no_mangle]
pub static a: [f32; 10] = [0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0];
(simplified of course)
I need to have access to its values from another .so and thinking on…
mbfernan
- 13
- 5
0
votes
1 answer
How can I link user32.lib for an i686 application (Windows)
I'm attempting to target i686-pc-windows-msvc, but this code
extern "C" {
pub fn GetDC(hdc: *const c_void) -> *const c_void;
}
fails to compile with
"C:\\Program Files (x86)\\Microsoft Visual…
David Taylor
- 31
- 2
0
votes
1 answer
Flutter Desktop C++ embed
I wanted to know if Flutter supports C/C++ embed via ffi for Desktop applications? I know you can do it for iOS and…
Rohan J. Dani
- 13
- 5
0
votes
1 answer
Ruby Fiddle - Cannot find function in WIndows MSYS2
I am trying to use Ruby Fiddle to access a C function I have developed. The C code is:
#include
#include
#include
double *linalg_positive_matrix(double *mat_a, int rows_a, int cols_a);
int main(void) {
}
double…
Rojj
- 1,170
- 1
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- 32
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1 answer
Create struct in C/Rust code for Node-FFI
I am trying to return a struct from a Rust function to Node.js, the struct is nested, and contains an array so it is sufficiently complicated that I want to do the allocation in Rust and have Node.JS receive a complete object, here's the Rust code…
Lee Hambley
- 6,270
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- 81
0
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1 answer
Rust FFI: function with multiple string pointers; first parameter has aggregated value from subsequent string pointers
Below, I have simple function with two string pointers parameters. First parameter is expression (i.e. value = "foo") and second parameter is json (i.e. value = {"foo":{"bar":{"baz":true}}}). When I execute the test I get the…
TiKi
- 15
- 3
0
votes
1 answer
How to call the function glMultiDrawElements :: GLenum -> GHC.Ptr.Ptr GLsizei -> GLenum -> GHC.Ptr.Ptr (GHC.Ptr.Ptr a) -> GLsizei -> IO ()
The ffunction glMultiDrawElements requires a pointer to a pointer as one of its arguments. How might one obtain a Ptr(Ptr a) from a StorableArray Int a ?
Eric
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