Flutter ngspice 插件如何为？

Flutter FFI 绑定 ngspice C 接口，实现一个 plugin 库： 可通过 pubspec.yaml 引入 上层提供 Dart API 接口 底层通过 FFI 调用 C 代码 ngspice 是一个开源的电路仿真器，主要用于电子电路的分析和设计。 代码： https://github.com/NebulWalk/mozsim_ngspice 准备 创建项目 创建 Flutter FFI plugin 项目， flutter create -t plugin_ffi --org cn.nebul --platforms ios,android,windows,linux,macos mozsim_ngspice cd mozsim_ngspice/ flutter pub outdated flutter pub upgrade --major-versions flutter pub add ffi 获取共享库 获取 ngspice shared libs，可以找预编译库，不然就从源码编译。 1）预编译库 Windows 下载预编译库进 windows/ngspice-44.2_dll_64 目录。 Download shared ngspice dll, 64 bit (VS) ✓ ngspice-44.2_dll_64.7z: https://sourceforge.net/projects/ngspice/files/ng-spice-rework/44.2/ $ tree windows -aF -L 2 --dirsfirst windows |-- ngspice-44.2_dll_64/ | `-- Spice64_dll/ |-- .gitignore `-- CMakeLists.txt 2）从源码编译 # ngspice 44.2 Commit [e011d1] master git clone -b master --depth 1 https://git.code.sf.net/p/ngspice/ngspice ngspice # Windows # - Building ngspice with MS Visual Studio 2022 # - flex-bison/: https://sourceforge.net/projects/winflexbison/ # - ngspice/visualc/sharedspice.sln: open as admin, run with ReleaseOpenMP x64 # Linux ./compile_linux_shared.sh 测试 Plugin 使用样例， cd mozsim_ngspice/example/ flutter run Dart 接口测试， $ cd mozsim_ngspice/ $ dart test/mozsim_ngspice_test.dart mozsim_ngspice_test ... |Char| stdout Hello from ngspice |Char| stdout Note: No compatibility mode selected! |Char| stdout Circuit: * voltage divider netlist |Stat| Prepare Deck |Stat| Parse |Char| stdout Doing analysis at TEMP = 27.000000 and TNOM = 27.000000 |Stat| Device Setup |Char| stdout Using SPARSE 1.3 as Direct Linear Solver |Stat| op |Char| stdout No. of Data Rows : 1 |Char| stdout out = 6.666667e-01 |Char| stdout ngspice-44.2 done |Char| stdout Note: 'quit' asks for resetting or detaching ngspice.dll. |Exit| status 0 immediate false quit true NgSpiceException: NgSpiceRequestType.command return error, ret=1 mozsim_ngspice_test done C++ 接口测试， # Windows > cd mozsim_ngspice/ > test\build\Debug\mozsim_ngspice_test.exe mozsim_ngspice_test ... |Char| stderr Warning: can't find the initialization file spinit. |Char| stdout ****** |Char| stdout ** ngspice-44.2 shared library |Char| stdout ** Creation Date: Jan 11 2025 14:16:40 |Char| stdout ****** |Char| stdout Hello from ngspice |Char| stdout Note: No compatibility mode selected! |Char| stdout Note: No compatibility mode selected! |Char| stdout Circuit: * voltage divider netlist |Stat| Prepare Deck |Stat| Parse |Char| stdout Doing analysis at TEMP = 27.000000 and TNOM = 27.000000 |Stat| Device Setup |Char| stdout Using SPARSE 1.3 as Direct Linear Solver |Stat| op |Char| stdout No. of Data Rows : 1 |Char| stdout out = 6.666667e-01 接口 Dart 接口重生成， # https://pub.dev/packages/ffigen dart run ffigen --config ffigen.yaml Dart 接口使用样例， import 'package:mozsim_ngspice/ngspice.dart'; void main(List<String> args) async { print('mozsim_ngspice_test ...'); await _main(); // await _main(); print('mozsim_ngspice_test done'); } Future<void> _main() async { NgSpice? ngspice; try { ngspice = await NgSpice.initByLib( NgSpice.libPath(NgSpice.libName, 'test/build/Debug/'), ); ngspice.resp.listen(_handleResponses); await ngspice.sendCommand('echo Hello from ngspice'); await ngspice.sendCircs([ '* voltage divider netlist', 'V1 in 0 1', 'R1 in out 1k', 'R2 out 0 2k', '.end', ]); await ngspice.sendCommands(['op', 'print out']); await ngspice.sendCommand('quit'); } on NgSpiceException catch (e) { print(e); } catch (e) { print('Caught error: $e'); } finally { await ngspice?.close(); } } void _handleResponses(NgSpiceResponse resp) { if (resp.type == NgSpiceResponseType.print) { final res = resp.data as String; print('|Char| $res'); } else if (resp.type == NgSpiceResponseType.stat) { final res = resp.data as String; print('|Stat| $res'); } else if (resp.type == NgSpiceResponseType.exit) { final (status, immediate, quit) = resp.data as (int, bool, bool); print('|Exit| status $status immediate $immediate quit $quit'); } } 参考 Flutter Developing FFI plugin packages ngspice Ngspice as a Shared Library Shared ngspice API