@@michaelthomsen6857 I general, I think engineers deserve far more recognition (and salary while I'm at it) than hr and managers since they do all the hard work which can't be denied (even though at Google I heard luckily this is not the case). I hope this will change over the next few years. Somehow in 2021 it is still normal that managers and hr are still pressuring the engineers for their own gains.
Sorry no, currently the only way is to use the toUtf8 function. Dart strings are UTF16 [1], and Dart strings can be moved by the Dart garbage collector. [1] api.dart.dev/dart-core/String-class.html
I am unable to use .dylib file in my flutter project without adding file via Xcode if I added .dylib via Xcode then working on macOS otherwise not. but working on other OS(windows=.a and linux=.so) except macOS. do anyone have solution for it, I will be able to use .dylib file without using XCode?
I'd like to use ffi/ffigen to make a Flutter Windows application that accesses peripherals connected to the desktop (usb, bluetooth, etc )! I have both 32-bit and 64-bit dlls that can access different hardware.. can flutter build/link with those dlls, and more importantly work when the dll functions are called? I did find a few older blog posts by Igor Kharakhordin, Nick Fisher , Majid Hajian , Marvin Sanchez (Integrating C library in a desktop Flutter app using Dart FFI, using Dart FFI to access native libraries in Flutter , Calling Native Libraries in Flutter with Dart FFI, Port an existing C/C++ app to Flutter with Dart FFI) however they're based on Flutter 2.x.. would love to see a video on actually using flutter to access a desktop device!
Great! Is it possible to use Android 10 AMidi Api with Dart FFi in Flutter? I ask because there is some JNI involved in getting the MIDI devices from Java side. Thanks
Can I use dart FFI for a C++,Qt project? If I use Android emulator on Windows then I use .so or .dll? If I have more than one .dll/.so file, how to deal with them?
.dylib is shared libraries for MacOS. And, CMakeLists.txt just contains compiling instructions of that dylib. You can compile your own .dylib/.DLL/.so using command line (gcc/g++/msvc etc) also. Or, you can use 3rd party libraries also if you know the function signatures.
@@michaelthomsen6857Source code is not working properly anymore (I am testing it under Windows). I had to add "C:/Program Files/Microsoft Visual Studio/2022/Professional/VC/Tools/Llvm/x64" as llvm-path in ffigen.yaml. Then the source gets generated with a lot of warnings, but the final result cannot be compiled in Android studio. I get errors like error: 'dynamic Function()' doesn't conform to the bound 'NativeType' of the type parameter 'T'. (type_argument_not_matching_bounds at [sqlite] lib\src\third_party\sqlite3\generated_bindings.dart:36) on the line ffi.Pointer arg0, ... etc etc.
Great job. Just an observation regarding the result of your recommended link: "131 packages for search query Note that sqlite (the first hit) says "DART 2 INCOMPATIBLE". A package that mentions "FFI" explicitly (and Null safety) is sqlite3. Lots of good effort. Congratulations and many thanks.
Looks nice, I am facing an issue whenever I give path like this final projLib = DynamicLibrary.open("../libs/dependencies/libproj.dylib"); I get error that failed: library "../libs/dependencies/libproj.dylib" not found
FFI should work with any language that compiles to modules that follow the C calling convention. Here's a small example for Rust. Consider this Rust code: #[no_mangle] pub extern fn add(i: i32, j: i32) -> i32 { return i + j; } We compile it to a dynamic library: ``` $ rustc --crate-type=cdylib add.rs ``` And then call it with this Dart FFI code: import 'dart:ffi'; import 'dart:io'; import 'package:ffi/ffi.dart'; main() { final dylib = DynamicLibrary.open('libadd.dylib'); final add = dylib.lookupFunction('add'); print(add(40, 2)); }
C++ won't "directly" work due to name mangling (as far as I know). So, you can't really predict the function name. You can fix it using extern "C" to tell C++ compiler not to modify the name. Then you're all good to go. And, surely you can guess that function overloading won't work for name un-mangled functions :)
![[UNCUT] “บอสณวัฒน์” ลากไส้!! ใครหนุนหลัง "แม่ตั๊ก ป๋าเบียร์" I คนดังนั่งเคลียร์ I 30 ก.ย. 67](http://i.ytimg.com/vi/QlD7mU2KKRk/mqdefault.jpg)
finally some advanced stuff....!!
Thanks Daco and Prerak for ffigen. It really is an awesome library.
Seriously life saving :)
@5:00 LOL, acting is part of the job it seems, that guy knows more than the manager...
I'm really happy you noticed this. I thought it was a nice little joke :-)
@@michaelthomsen6857 I general, I think engineers deserve far more recognition (and salary while I'm at it) than hr and managers since they do all the hard work which can't be denied (even though at Google I heard luckily this is not the case). I hope this will change over the next few years. Somehow in 2021 it is still normal that managers and hr are still pressuring the engineers for their own gains.
@@michaelthomsen6857 It was definitely a nice joke, I'll give you that :)
the way code is explained is pretty simple and easy to understand
This is amazing! Thanks for the hard work!
Thank you Daco and Prerak for the excellent job you do
I found this overview quite useful! Thank you!
The video is 13:37 in length
Hi, how i can convert the .c file to .dylib file
is there anyway to declare native utf8 in Dart without calling the converter function?
Sorry no, currently the only way is to use the toUtf8 function.
Dart strings are UTF16 [1], and Dart strings can be moved by the Dart garbage collector.
[1] api.dart.dev/dart-core/String-class.html
Though, it would be cool to not rely on _Pointer_ for arrays outside structs. Managing arrays is quite a pain point for now, not to say unsafe.
bruh, Daco is legit an AI
Amazing. Need Fuschia Things as a replacement for Android Things
I am unable to use .dylib file in my flutter project without adding file via Xcode
if I added .dylib via Xcode then working on macOS otherwise not.
but working on other OS(windows=.a and linux=.so) except macOS.
do anyone have solution for it, I will be able to use .dylib file without using XCode?
please add ffi to web wasm build 🙏
Can't load , but have to create a separate plugins and then it starts working
I'd like to use ffi/ffigen to make a Flutter Windows application that accesses peripherals connected to the desktop (usb, bluetooth, etc )!
I have both 32-bit and 64-bit dlls that can access different hardware.. can flutter build/link with those dlls, and more importantly work when the dll functions are called?
I did find a few older blog posts by Igor Kharakhordin, Nick Fisher , Majid Hajian , Marvin Sanchez
(Integrating C library in a desktop Flutter app using Dart FFI, using Dart FFI to access native libraries in Flutter , Calling Native Libraries in Flutter with Dart FFI, Port an existing C/C++ app to Flutter with Dart FFI)
however they're based on Flutter 2.x.. would love to see a video on actually using flutter to access a desktop device!
Great! Is it possible to use Android 10 AMidi Api with Dart FFi in Flutter? I ask because there is some JNI involved in getting the MIDI devices from Java side. Thanks
Can I use dart FFI for a C++,Qt project? If I use Android emulator on Windows then I use .so or .dll? If I have more than one .dll/.so file, how to deal with them?
What about javascript function please i need something for it does anyone know about it
I couldn't access the file (libutils.1.0.0.bylib)... Any help?
Can I use this to call c++ opengl
It is possible to load 32bit DLL dart:ffi?
please make tutorial for Android
How to create CMakeLists.txt and .dylib file?
.dylib is shared libraries for MacOS. And, CMakeLists.txt just contains compiling instructions of that dylib. You can compile your own .dylib/.DLL/.so using command line (gcc/g++/msvc etc) also. Or, you can use 3rd party libraries also if you know the function signatures.
By reading cmake documentation
Why would we need to call c++ code what are possibilities
Can i access to the source code on the video?
Go to this timestamp:
11:20
Hi Diego, it's here: github.com/mit-mit/ffi-talk
@@michaelthomsen6857Source code is not working properly anymore (I am testing it under Windows). I had to add "C:/Program Files/Microsoft Visual Studio/2022/Professional/VC/Tools/Llvm/x64" as llvm-path in ffigen.yaml. Then the source gets generated with a lot of warnings, but the final result cannot be compiled in Android studio. I get errors like error: 'dynamic Function()' doesn't conform to the bound 'NativeType' of the type parameter 'T'. (type_argument_not_matching_bounds at [sqlite] lib\src\third_party\sqlite3\generated_bindings.dart:36) on the line ffi.Pointer arg0, ... etc etc.
Sorry guys but this fake pretending of scenario conversations is really weird please dont do this
Great job. Just an observation regarding the result of your recommended link: "131 packages for search query
Note that sqlite (the first hit) says "DART 2 INCOMPATIBLE". A package that mentions "FFI" explicitly (and Null safety) is sqlite3. Lots of good effort. Congratulations and many thanks.
Looks nice, I am facing an issue whenever I give path like this final projLib = DynamicLibrary.open("../libs/dependencies/libproj.dylib"); I get error that failed: library "../libs/dependencies/libproj.dylib" not found
How about C++,Rust and golang?
FFI should work with any language that compiles to modules that follow the C calling convention.
Here's a small example for Rust. Consider this Rust code:
#[no_mangle]
pub extern fn add(i: i32, j: i32) -> i32 {
return i + j;
}
We compile it to a dynamic library:
```
$ rustc --crate-type=cdylib add.rs
```
And then call it with this Dart FFI code:
import 'dart:ffi';
import 'dart:io';
import 'package:ffi/ffi.dart';
main() {
final dylib = DynamicLibrary.open('libadd.dylib');
final add = dylib.lookupFunction('add');
print(add(40, 2));
}
C++ won't "directly" work due to name mangling (as far as I know). So, you can't really predict the function name. You can fix it using extern "C" to tell C++ compiler not to modify the name. Then you're all good to go. And, surely you can guess that function overloading won't work for name un-mangled functions :)