[Flutter/Dart] Support Dart: Use Dart FFI

[hhstore]

Support Dart:

• since i want to use wallet-core in dart.
• so i try to use dart:ffi to make it.
• but i am not quite familiar with wallet-core.
• anyone who wants to help me? or any suggestions on where to start first?
• i would really appreciate it.

my fork:

• https://github.com/better-dart/trustwallet-core/tree/dart/ffi-base-on-v2.3.9
• dev-branch: dart/ffi-base-on-v2.3.9
• i will add dart:ffi to support dart here.

dart ffi:

• https://dart.dev/guides/libraries/c-interop
• https://flutter.dev/docs/development/platform-integration/c-interop

libs:

• https://github.com/dart-lang/ffi
• https://github.com/dart-lang/ffigen
  • a tool to auto gen binding codes.

usage: c++ with ffi

• https://github.com/dart-lang/tflite_native

Maybe these are the things I need?

docs:

• binding: https://developer.trustwallet.com/wallet-core/developing-the-library/building

• ios: https://developer.trustwallet.com/wallet-core/integration-guide/ios-guide

 pod 'TrustWalletCore'

• android: https://developer.trustwallet.com/wallet-core/integration-guide/android-guide

jni load:

init {
    System.loadLibrary("TrustWalletCore")
}

• go: https://developer.trustwallet.com/wallet-core/integration-guide/server-side

*.h

• https://github.com/trustwallet/wallet-core/blob/81a5b234f6/include/TrustWalletCore/TWHDWallet.h

jni:

• https://github.com/trustwallet/wallet-core/blob/81a5b234f6/jni/cpp/TWJNI.h

gen proto ?

• https://github.com/trustwallet/wallet-core/blob/e8ff9c7106/tools/generate-files

• pb: https://github.com/trustwallet/wallet-core/blob/e8ff9c7106/src/proto/Ethereum.proto

iOS:

• https://github.com/trustwallet/wallet-core/blob/81a5b234f6/tools/ios-build

Android:

• https://github.com/trustwallet/wallet-core/blob/81a5b234f6/tools/android-build

code gen:

• https://github.com/trustwallet/wallet-core/blob/99af2f62cd/codegen/lib/code_generator.rb

[hhstore]

The latest progress:

• https://github.com/better-dart/wallet-core/blob/dart%2Fffi-base-on-v2.3.9/dart/README.md
• the dart binding file has been successfully generated, and I am testing it.

pubspec.yaml

• https://github.com/better-dart/wallet-core/blob/dart%2Fffi-base-on-v2.3.9/dart/pubspec.yaml

dart binding file:

• https://github.com/better-dart/wallet-core/blob/dart%2Fffi-base-on-v2.3.9/dart/lib/wallet_core_bindings.dart#L7
• this is the generate binding codes.

[hewigovens]

Are you building dart bindings on top of existing iOS/android lib?

[hhstore]

Are you building dart bindings on top of existing iOS/android lib?

• i think i need iOS/Android dynamic library.
• but i not sure, if Android wallet-core.aar is what i needed? or i should build a dynamic library by myself?
• from this doc, https://developer.trustwallet.com/wallet-core/developing-the-library/releasing
  • https://bintray.com/trust/wallet-core/com.trustwallet.wallet-core
• i find android wallet-core.aar file.
• i still working on how to add android wallet-core.aar to my flutter project and call it via dart binding codes, since the docs related to dart:ffi are really rare.
• in this process, I encountered some problems, some errors. i'm working on it.

about dart ffi usage:

• https://flutter.dev/docs/development/platform-integration/c-interop#step-3-load-the-code-using-the-ffi-library

rust + ffi + flutter:

• i find a rust ffi binding usage here: https://github.com/Hentioe/mikack-ffi
  • https://github.com/Hentioe/mikack-ffi/blob/master/Makefile#L42
• this a rust ffi usage, use for a flutter project. i think i'm going to do something like this.

[hewigovens]

Hey, what's status of dart binding? I think you can skip building process and unzip aar from here https://bintray.com/trust/wallet-core/com.trustwallet.wallet-core/2.4.1

[jayateertha043]

Hey,
I was also looking for the same integration ,if you managed to integrate trust wallet into flutter kindly let me know

Thanks and regards
Jayateertha G

[jayateertha043]

Can't we just put the aar files into android/lib/ folder and interact with them using method channel ?

[hhstore]

@hewigovens

• It's not going well.
• I encountered some native-related problems, which I can't solve at the moment.
• Due to time constraints, I am temporarily using the dart native library instead.
• However, I will still consider replacing it with trustwallet-core.
• I would still try the FFI or channel method to bind the trustwallet-core.

Follow up:

• The latest developments will be synchronized in the following 2 projects.

use FFI:

• https://github.com/better-dart/trustwallet-core

use Platform Channels:

• https://github.com/better-dart/flutter_trust_wallet_core
• channel method

[hhstore]

@jayateertha043

• Using the channel method is a good choice.
• To use the channel method, you need to write Android/iOS native codes, but I'm not familiar with native.
• If you are familiar with native coding, you can try it.

[memtopia]

I'm impl a Flutter plugin to doing this, most method are wrap, will keep updating, welcome pull request

https://github.com/weishirongzhen/flutter_trust_wallet_core

[memtopia]

You can use ios lib from official, but android lib need's to be set preset visibility to default and rebuild from source, otherwise ffi can not lookup function from android side.

[hhstore]

My mistake. just noticed the flutter version. already supported null safety is great.

Is there any way to solve the android aar problem?

[hhstore]

I'm running the example on my iPhone, and it seems to be working fine with flutter.2.2.3.

I will take the time to migrate my project (previously using web3dart), thank you very much.

[hhstore]

[hhstore]

https://discord.com/invite/MnDA9pfWAW

btw, I have created a discord technical discussion group, feel free to join and discuss flutter related technologies.

[hhstore]

a PR here:

• https://github.com/weishirongzhen/flutter_trust_wallet_core/pull/13
• I replaced the iOS/Android framework dependencies with the official sources.
• I submitted a PR, solving the problem of publishing to pub.dev.
  I tested it locally for iOS and it works fine, but there are some issues with the Android dependency changes.
• However, you can choose to keep the android aar, and you can submit https://pub.dev/ directly
• Or, you can choose to fix the Android error and then publish it.
• I'm not familiar with native, I can't fix this error. I need some help. The error message is here.
• https://github.com/weishirongzhen/flutter_trust_wallet_core/issues/12

Android aar file:

• https://github.com/weishirongzhen/flutter_trust_wallet_core/blob/main/android/libs/trustwalletcore.aar
• just 12.5MB. it's ok for publish to https://pub.dev/ now.

iOS frameworks:

• https://github.com/weishirongzhen/flutter_trust_wallet_core/blob/main/ios/Frameworks/WalletCore.xcframework/ios-arm64/WalletCore.framework/WalletCore
• this is so big. 63.8MB, remove this is safety.
• https://github.com/weishirongzhen/flutter_trust_wallet_core/blob/main/ios/Frameworks/WalletCore.xcframework/ios-arm64_x86_64-maccatalyst/WalletCore.framework/WalletCore

@weishirongzhen @hewigovens

[hhstore]

• btw, I suggest merging it flutter_trust_wallet_core into the official repo.
• It is convenient for more people to use it.

[memtopia]

There still lots of things todo, especially AnySigner and Protobuf side. Still lack of Complete test case, code check，and so on.... After all this done, then I'll consider make a pull request to this repo.

[hewigovens]

Added to readme: https://github.com/trustwallet/wallet-core#community

[baahkusi]

Impressive work @weishirongzhen . Also started a trustwallet-core flutter plugin using methodChannels @hhstore . The project is at a much younger stage as a proof of concept but starting to get more attention.

https://github.com/EjaraApp/trustdart

[Ce1ling]

Hey 👋, do you guys have any updates on this matter? I think it’s really important to make it support Flutter.

[Ruyeduardo]

Banco Beneficiário: Banco Topazio S/A | Código SWIFT: TOPZBRRSXXX | IBAN: BR9407679404000000598183965C1 | Titular da Conta: Ruy Eduardo Barbosa De Assuncao Maia | Endereço: Rua 18 de Novembro, 273 - Porto Alegre - RS, 90240-040 /// Banco Intermediário: Standard Chartered Bank | Código SWIFT: SCBLUS33 | Titular da Conta: Banco Topazio S/A | Número da Conta: 3544026839001 | Endereço: New York, USA Em qua., 28 de fev. de 2024 00:42, L1en ***@***.***> escreveu:

…

Hey 👋, do you guys have any updates on this matter? I think it’s really important to make it support Flutter. — Reply to this email directly, view it on GitHub <#1264 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/A2PQQHEAESTIKQRLWVWUHMDYV2RSLAVCNFSM43U5UEPKU5DIOJSWCZC7NNSXTOKENFZWG5LTONUW63SDN5WW2ZLOOQ5TQNRRGMYTCNI> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.*** .com>