ffi | A Foreign Function Call Through the TIOBE Top | Wrapper library

by jaseg C++ Version: Current License: No License

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | ffi Summary

ffi is a C++ library typically used in Utilities, Wrapper applications. ffi has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

The "and some" being due to TIOBE Top 20 being a shitty index and lacked some of the most interesting languages. The call starts in Java and proceeds through the chain (with highlights such as PL/PGSQL, VisualBasic and bash) and ends up in a kernel module providing the much needed "leftpad" functionality. This will probably be almost impossible to reproduce as I did some pretty dirty hacks to make this even work, but I warmly invite you to try. I did all of this on a sort-of up-to-date debian stable with mono, jxcore, postgres and go built from source. I can send you a copy of the ~10GB debian VM image I used to develop this, just ``/query`` me on freenode.

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Quality

Security

License

Reuse

Support

ffi has a low active ecosystem.

It has 47 star(s) with 1 fork(s). There are 5 watchers for this library.

It had no major release in the last 6 months.

There are 1 open issues and 0 have been closed. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of ffi is current.

Quality

ffi has 0 bugs and 0 code smells.

Security

ffi has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

ffi code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

ffi does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

Reuse

ffi releases are not available. You will need to build from source code and install.

It has 433 lines of code, 24 functions and 15 files.

It has low code complexity. Code complexity directly impacts maintainability of the code.

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ffi Key Features

No Key Features are available at this moment for ffi.

ffi Examples and Code Snippets

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Community Discussions

Trending Discussions on ffi

Why do most ffi functions use raw pointers instead of references?

How to get UniquePtr on the Rust side? (CXX crate)

Passing a safe rust function pointer to C

Dart FFI keep Struct pointer

OSError: /usr/lib/ghc/ghc-prim-0.5.2.0/libHSghc-prim-0.5.2.0-ghc8.4.4.so: undefined symbol: stg_gc_unpt_r1

Could not find 'ffi' (>= 1.3.0) among 85 total gem(s) (Gem::MissingSpecError) React native IOS on pod install

Adding imagemagick into my php 7.4 docker raised error

iOS 15 SDK - `memcpy()` not exported

M1 App Build iOS Failed Flutter - AMSupportURLConnectionDelegate Location & Geolocator Packages

Pinned reference to FFI object consumed by calling methods that receive it

QUESTION

Why do most ffi functions use raw pointers instead of references?

Asked 2022-Apr-05 at 15:13

Both in ffi tutorials and in automatically generated interfaces, *const T pointers are used most of the time. As far as I know the difference between &T and *const T is only that *const T doesn't have to fulfill certain conditions like not being null and is unsafe to dereference.

...

ANSWER

Answered 2022-Apr-05 at 10:07

An element of answer can probably be found in the fact that references must be aligned. As using un-aligned references is undefined behaviour, and the alignment of the pointers cannot be guaranteed in FFIs, defaulting to pointers seems to be a sane choice

Source https://stackoverflow.com/questions/71749287

QUESTION

How to get UniquePtr on the Rust side? (CXX crate)

Asked 2022-Jan-27 at 20:47

Using the cxx crate: https://crates.io/crates/cxx

I have the following struct on Rust:

...

ANSWER

Answered 2022-Jan-27 at 20:47

Try adding:

Source https://stackoverflow.com/questions/70884432

QUESTION

Passing a safe rust function pointer to C

Asked 2022-Jan-25 at 22:52

I've created rust bindings to a C library and currently writing safe wrappers around it.

The question is about C functions which take in C function pointers which are not able to take in any custom user data.

It is easier to explain it with an example,

C Library:

...

ANSWER

Answered 2022-Jan-25 at 22:52

First off, this is a pretty hard problem to solve. Obviously, you need some way to pass data into a function outside of its arguments. However, pretty any method of doing that via a static could easily result in race conditions or worse, depending on what the c library does and how the library is used. The other option is to JIT some glue code that calls your closure. At first glance, that seems even worse, but libffi abstracts most of that away. A wrapper using the libffi crate would like this:

Source https://stackoverflow.com/questions/70840454

QUESTION

Dart FFI keep Struct pointer

Asked 2022-Jan-25 at 12:33

I am trying to call a C library from dart. The C code as a genertor method such as

...

ANSWER

Answered 2022-Jan-25 at 12:33

When you return a struct by value from C to Dart, the struct is copied into a relocatable memory block that's fully managed by Dart.

Dart doesn't provide an API that exposes the underlying address of these objects, and so if you need to pass that data to C by reference, you'll need to store it in a non-relocatable native memory region (i.e. heap allocate it or use global C state) and keep track of a pointer to it on the Dart side.

If you can't (or would prefer not to) modify the C++ library, you could use the Dart FFI package to call malloc() and then copy the struct into the newly allocated space with ref= setter.

Source https://stackoverflow.com/questions/70548745

QUESTION

OSError: /usr/lib/ghc/ghc-prim-0.5.2.0/libHSghc-prim-0.5.2.0-ghc8.4.4.so: undefined symbol: stg_gc_unpt_r1

Asked 2021-Dec-25 at 01:33

I am trying to run this example from github: https://github.com/nh2/haskell-from-python/blob/master/Makefile I wanted to get an introduction to running one language from another language. I'm not sure if FFI is playing a role here somehow, I just don't know enough to tell.

I am running the code on WSL - debian. I also tried running it on windows, but I get the same issue. My error is after running 'make' and then 'python program.py' I get:

...

ANSWER

Answered 2021-Dec-25 at 01:33

I've tried to duplicate your problem with a fresh Debian under WSL install. I'm running Debian "bullseye" under WSL 1 under Windows 10. That Debian version must be a little newer than yours, since the GHC packages are version 8.8.4 instead of 8.4.4, but that seems to be the only difference.

Using a clean copy of that Git repository (commit 9c3b6315) with only the Makefile changed (exactly as below except with usual "tab" indentation):

Source https://stackoverflow.com/questions/70436507

QUESTION

Could not find 'ffi' (>= 1.3.0) among 85 total gem(s) (Gem::MissingSpecError) React native IOS on pod install

Asked 2021-Nov-05 at 05:58

Hi I'm trying to run my react native app on mac mini. I can run another app also this app to but when i write pod install in terminal it gives this error.

...

ANSWER

Answered 2021-Sep-08 at 06:55

You can try this command

Source https://stackoverflow.com/questions/69098207

QUESTION

Adding imagemagick into my php 7.4 docker raised error

Asked 2021-Oct-11 at 07:29

I need to add imagemagick into my php 7.4 docker, so in file Dockerfile.yml I added :

...

ANSWER

Answered 2021-Oct-11 at 07:29

The message

Source https://stackoverflow.com/questions/69507747

QUESTION

iOS 15 SDK - `memcpy()` not exported

Asked 2021-Sep-30 at 06:53

I've been using memcpy in some Dart/Flutter code (through FFI), but with the latest Xcode + iOS 15 simulator, it's not available anymore (Failed to lookup symbol (dlsym(RTLD_DEFAULT, memcpy): symbol not found). Anyone an idea why they've hidden the symbol in the runtime? And more importantly, if there's a way to get it back? Maybe some library to link in the podspec or something?

The code in question is

...

ANSWER

Answered 2021-Sep-30 at 06:53

Looks like an issue in Flutter v2.5.1 (currrent stable), not present in current beta channel.

https://github.com/flutter/flutter/issues/90896#issuecomment-930052186

Source https://stackoverflow.com/questions/69324507

QUESTION

M1 App Build iOS Failed Flutter - AMSupportURLConnectionDelegate Location & Geolocator Packages

Asked 2021-Sep-20 at 09:47

Please help, I have just paid for some development work and gotten the app back. The Developer claims they have no problem running the app. I can not get it to run on my machine. The app was running before the developer added state management via block.

It looks like package/cocoapods/Xcode error which should be resolvable using latest versions, but nothing I can do clears these errors. Every time I get close I run again and all the errors come right back. I am in an endless troubleshooting loop without resolution. I am a beginner and can not afford to pay the developer $50hr to troubleshoot why an app won't run on my computer so I am tools down and stalled until I get this issue resolved.

I have reinstalled Cocoapods. I have tried deleting PODS file. I have tried using an old PODS file. I have ensured it is the right version for M1 with the ffi arch install. I have updated my developer certificate. Pasted Arch 86 into Xcode settings. Set versions to the latest for deployment. I have even wiped my Mac out completely and reinstalled ALL environments from scratch but the errors persist. I have done flutter clean and Flutter pub get and flutter build iOS and flutter run 1000 times in the last week. I can not get this app to build for iOS and I am losing my mind. I have been trying to get it to run for almost 2 weeks! Developer spent an hour with me and all they asked me to do was all the stuff I have already done by searching online for known issues. I am out of ideas. I need help to solve this. PLEASE HELP

...

ANSWER

Answered 2021-Jul-27 at 03:55

Got it resolved. I went back to my last working version before I hired the Developers and it runs just fine. So I pasted their lib in.... and that errored. They looked at error and it was because I needed to paste in the intl file and then fix a couple settings in Xcode. None of us knows why it was erroring on my computer only or why pasting their lib into my last working copy worked, but it is resolved. I suspect it was a Git conflict, because of the latest update to Xcode but we really don't know why. But it is resolved.

Thank-you to those who tried to help.

Source https://stackoverflow.com/questions/68494630

QUESTION

Pinned reference to FFI object consumed by calling methods that receive it

Asked 2021-Aug-19 at 02:18

I'm writing a foreign function interface (ffi) to expose the API of a pre-existing C++ library to some new Rust code I am writing. I am using the Rust cxx module for this.

I am running into some problems related to Pin (a topic which I have to admit I don't have a complete grasp of).

My C++ module has an API that exposes pointers to some contained objects from the main object that owns these contained objects. Here is a contrived example:

...

ANSWER

Answered 2021-Aug-19 at 02:18

Is it sound for me to call Pin::new_unchecked here?

Yes, it's sound. In this context, we know the Row is pinned because:

The Table is pinned;
The Row is stored inline in the Table;
C++'s move semantics essentially means every C++ object is "pinned" anyway.

This program fails to compile with the following error:

When you call a method on a normal mutable reference (&mut T), the compiler implicitly performs a reborrow in order to avoid moving the mutable reference, because &mut T is not Copy. Unfortunately, this compiler "magic" doesn't extend to Pin<&mut T> (which is not Copy either), so instead we must reborrow explicitly.

The easiest way to reborrow is to use Pin::as_mut(). This use case is even called out in the documentation:

This method is useful when doing multiple calls to functions that consume the pinned type.

Source https://stackoverflow.com/questions/68841016

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Install ffi

You can download it from GitHub.

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