Flutter FFI 桥接技术

YGKing NaN-aN-aNFlutter FFI C/C++原生集成性能优化 3132 个字 12 分钟

概述

Flutter FFI（Foreign Function Interface）是一种强大的桥接技术，允许 Flutter 应用直接调用 C/C++代码，实现高性能的原生集成。本文将深入探讨 Flutter FFI 的使用方法、最佳实践和高级应用场景。

FFI 基础

1. 环境配置

yaml

# pubspec.yaml
dependencies:
  ffi: ^2.0.1
  path: ^1.8.3

dev_dependencies:
  ffigen: ^8.0.2
  build_runner: ^2.4.6

dart

// dart:ffi基础导入
import 'dart:ffi';
import 'package:ffi/ffi.dart';

2. 基础类型映射

dart

// FFI类型映射示例
class FFITypes {
  // 基础类型映射
  static const int INT8_SIZE = 1;
  static const int INT16_SIZE = 2;
  static const int INT32_SIZE = 4;
  static const int INT64_SIZE = 8;
  static const int FLOAT_SIZE = 4;
  static const int DOUBLE_SIZE = 8;

  // Dart到C类型转换
  static Pointer<Char> stringToCharPointer(String str, {Allocator allocator = calloc}) {
    final strPtr = str.toNativeUtf8(allocator: allocator);
    return strPtr.cast<Char>();
  }

  static String charPointerToString(Pointer<Char> ptr) {
    return ptr.toDartString();
  }

  // 数组转换
  static Pointer<Int32> intListToInt32Pointer(List<int> list, {Allocator allocator = calloc}) {
    final ptr = allocator<Int32>(list.length);
    for (int i = 0; i < list.length; i++) {
      ptr[i] = list[i];
    }
    return ptr;
  }

  static List<int> int32PointerToIntList(Pointer<Int32> ptr, int length) {
    return List.generate(length, (i) => ptr[i]);
  }

  // 结构体转换
  static Pointer<NativePoint> pointToNativePoint(Point point, {Allocator allocator = calloc}) {
    final ptr = allocator<NativePoint>();
    ptr.ref.x = point.x;
    ptr.ref.y = point.y;
    return ptr;
  }

  static Point nativePointToPoint(Pointer<NativePoint> ptr) {
    return Point(ptr.ref.x, ptr.ref.y);
  }
}

// 原生结构体定义
class NativePoint extends Struct {
  @Double()
  external double x;

  @Double()
  external double y;
}

// Dart类定义
class Point {
  final double x;
  final double y;

  Point(this.x, this.y);
}

3. 动态库加载

dart

// 动态库加载管理器
class DynamicLibraryLoader {
  static DynamicLibrary? _library;
  static final Map<String, DynamicLibrary> _libraries = {};

  // 加载动态库
  static DynamicLibrary loadLibrary(String libraryName) {
    if (_libraries.containsKey(libraryName)) {
      return _libraries[libraryName]!;
    }

    DynamicLibrary library;

    try {
      // 根据平台加载不同的库
      if (Platform.isAndroid || Platform.isLinux) {
        library = DynamicLibrary.open('lib$libraryName.so');
      } else if (Platform.isIOS || Platform.isMacOS) {
        library = DynamicLibrary.open('lib$libraryName.dylib');
      } else if (Platform.isWindows) {
        library = DynamicLibrary.open('$libraryName.dll');
      } else {
        throw UnsupportedError('Unsupported platform');
      }
    } catch (e) {
      // 尝试从系统路径加载
      library = DynamicLibrary.process();
    }

    _libraries[libraryName] = library;
    return library;
  }

  // 获取库函数
  static Pointer<NativeFunction<T>> getFunction<T extends Function>(
    DynamicLibrary library,
    String functionName,
  ) {
    try {
      return library.lookup<NativeFunction<T>>(functionName);
    } catch (e) {
      throw Exception('Failed to find function $functionName: $e');
    }
  }

  // 释放库资源
  static void unloadLibrary(String libraryName) {
    _libraries.remove(libraryName);
  }

  // 释放所有库资源
  static void unloadAll() {
    _libraries.clear();
  }
}

C/C++集成

1. C 函数绑定

dart

// C函数绑定示例
class CFunctionBindings {
  late final DynamicLibrary _library;

  // 数学函数
  late final int Function(int, int) _add;
  late final double Function(double, double) _multiply;
  late final Pointer<Char> Function(Pointer<Char>) _processString;

  // 数组处理函数
  late final Pointer<Int32> Function(Pointer<Int32>, int) _processArray;
  late final int Function(Pointer<Int32>, int) _calculateSum;

  // 结构体处理函数
  late final Pointer<NativePoint> Function(Pointer<NativePoint>, Pointer<NativePoint>) _addPoints;
  late final double Function(Pointer<NativePoint>) _calculateDistance;

  CFunctionBindings(String libraryName) {
    _library = DynamicLibraryLoader.loadLibrary(libraryName);
    _bindFunctions();
  }

  void _bindFunctions() {
    // 绑定数学函数
    _add = _library.lookupFunction<NativeFunction<Int32 Function(Int32, Int32)>, int Function(int, int)>('add');
    _multiply = _library.lookupFunction<NativeFunction<Double Function(Double, Double)>, double Function(double, double)>('multiply');
    _processString = _library.lookupFunction<NativeFunction<Pointer<Char> Function(Pointer<Char>)>, Pointer<Char> Function(Pointer<Char>)>('process_string');

    // 绑定数组处理函数
    _processArray = _library.lookupFunction<NativeFunction<Pointer<Int32> Function(Pointer<Int32>, Int32)>, Pointer<Int32> Function(Pointer<Int32>, int)>('process_array');
    _calculateSum = _library.lookupFunction<NativeFunction<Int32 Function(Pointer<Int32>, Int32)>, int Function(Pointer<Int32>, int)>('calculate_sum');

    // 绑定结构体处理函数
    _addPoints = _library.lookupFunction<NativeFunction<Pointer<NativePoint> Function(Pointer<NativePoint>, Pointer<NativePoint>)>, Pointer<NativePoint> Function(Pointer<NativePoint>, Pointer<NativePoint>)>('add_points');
    _calculateDistance = _library.lookupFunction<NativeFunction<Double Function(Pointer<NativePoint>)>, double Function(Pointer<NativePoint>)>('calculate_distance');
  }

  // 包装函数
  int add(int a, int b) => _add(a, b);
  double multiply(double a, double b) => _multiply(a, b);

  String processString(String input) {
    final inputPtr = FFITypes.stringToCharPointer(input);
    final resultPtr = _processString(inputPtr);
    final result = FFITypes.charPointerToString(resultPtr);
    calloc.free(inputPtr);
    return result;
  }

  List<int> processArray(List<int> input) {
    final inputPtr = FFITypes.intListToInt32Pointer(input);
    final resultPtr = _processArray(inputPtr, input.length);
    final result = FFITypes.int32PointerToIntList(resultPtr, input.length);
    calloc.free(inputPtr);
    return result;
  }

  int calculateSum(List<int> numbers) {
    final numbersPtr = FFITypes.intListToInt32Pointer(numbers);
    final sum = _calculateSum(numbersPtr, numbers.length);
    calloc.free(numbersPtr);
    return sum;
  }

  Point addPoints(Point a, Point b) {
    final aPtr = FFITypes.pointToNativePoint(a);
    final bPtr = FFITypes.pointToNativePoint(b);
    final resultPtr = _addPoints(aPtr, bPtr);
    final result = FFITypes.nativePointToPoint(resultPtr);
    calloc.free(aPtr);
    calloc.free(bPtr);
    return result;
  }

  double calculateDistance(Point point) {
    final pointPtr = FFITypes.pointToNativePoint(point);
    final distance = _calculateDistance(pointPtr);
    calloc.free(pointPtr);
    return distance;
  }
}

2. C++类绑定

dart

// C++类绑定示例
class CppClassBindings {
  late final DynamicLibrary _library;

  // 构造函数和析构函数
  late final Pointer<Void> Function() _createObject;
  late final void Function(Pointer<Void>) _destroyObject;

  // 成员函数
  late final void Function(Pointer<Void>, int) _setValue;
  late final int Function(Pointer<Void>) _getValue;
  late final void Function(Pointer<Void>, Pointer<Char>) _setName;
  late final Pointer<Char> Function(Pointer<Void>) _getName;

  // 静态函数
  late final int Function(int, int) _staticMethod;

  CppClassBindings(String libraryName) {
    _library = DynamicLibraryLoader.loadLibrary(libraryName);
    _bindFunctions();
  }

  void _bindFunctions() {
    // 绑定构造函数和析构函数
    _createObject = _library.lookupFunction<NativeFunction<Pointer<Void> Function()>, Pointer<Void> Function()>('CppObject_create');
    _destroyObject = _library.lookupFunction<NativeFunction<Void Function(Pointer<Void>)>, void Function(Pointer<Void>)>('CppObject_destroy');

    // 绑定成员函数
    _setValue = _library.lookupFunction<NativeFunction<Void Function(Pointer<Void>, Int32)>, void Function(Pointer<Void>, int)>('CppObject_setValue');
    _getValue = _library.lookupFunction<NativeFunction<Int32 Function(Pointer<Void>)>, int Function(Pointer<Void>)>('CppObject_getValue');
    _setName = _library.lookupFunction<NativeFunction<Void Function(Pointer<Void>, Pointer<Char>)>, void Function(Pointer<Void>, Pointer<Char>)>('CppObject_setName');
    _getName = _library.lookupFunction<NativeFunction<Pointer<Char> Function(Pointer<Void>)>, Pointer<Char> Function(Pointer<Void>)>('CppObject_getName');

    // 绑定静态函数
    _staticMethod = _library.lookupFunction<NativeFunction<Int32 Function(Int32, Int32)>, int Function(int, int)>('CppObject_staticMethod');
  }

  // 包装类
  CppObject createCppObject() {
    return CppObject._(this, _createObject());
  }

  int staticMethod(int a, int b) => _staticMethod(a, b);

  void destroyObject(Pointer<Void> ptr) {
    _destroyObject(ptr);
  }

  void setValue(Pointer<Void> ptr, int value) {
    _setValue(ptr, value);
  }

  int getValue(Pointer<Void> ptr) {
    return _getValue(ptr);
  }

  void setName(Pointer<Void> ptr, String name) {
    final namePtr = FFITypes.stringToCharPointer(name);
    _setName(ptr, namePtr);
    calloc.free(namePtr);
  }

  String getName(Pointer<Void> ptr) {
    final namePtr = _getName(ptr);
    final name = FFITypes.charPointerToString(namePtr);
    return name;
  }
}

// C++对象的Dart包装类
class CppObject {
  final CppClassBindings _bindings;
  final Pointer<Void> _ptr;
  bool _disposed = false;

  CppObject._(this._bindings, this._ptr);

  // 属性访问
  int get value {
    _checkDisposed();
    return _bindings.getValue(_ptr);
  }

  set value(int value) {
    _checkDisposed();
    _bindings.setValue(_ptr, value);
  }

  String get name {
    _checkDisposed();
    return _bindings.getName(_ptr);
  }

  set name(String name) {
    _checkDisposed();
    _bindings.setName(_ptr, name);
  }

  // 方法调用
  void dispose() {
    if (!_disposed) {
      _bindings.destroyObject(_ptr);
      _disposed = true;
    }
  }

  void _checkDisposed() {
    if (_disposed) {
      throw StateError('CppObject has been disposed');
    }
  }
}

内存管理

1. 自动内存管理

dart

// FFI内存管理器
class FFIMemoryManager {
  static final List<Pointer<Void>> _allocatedPointers = [];
  static final Map<String, Pointer<Void>> _namedPointers = {};
  static Timer? _cleanupTimer;

  // 初始化内存管理
  static void initialize() {
    _cleanupTimer = Timer.periodic(Duration(minutes: 1), (_) => _cleanup());
  }

  // 分配内存
  static Pointer<T> allocate<T extends NativeType>(int count, {String? name}) {
    final ptr = calloc<T>(count);
    _allocatedPointers.add(ptr.cast<Void>());

    if (name != null) {
      _namedPointers[name] = ptr.cast<Void>();
    }

    return ptr;
  }

  // 释放内存
  static void deallocate<T extends NativeType>(Pointer<T> ptr) {
    calloc.free(ptr);
    _allocatedPointers.remove(ptr.cast<Void>());

    // 从命名指针中移除
    _namedPointers.removeWhere((key, value) => value == ptr.cast<Void>());
  }

  // 通过名称释放内存
  static void deallocateByName(String name) {
    final ptr = _namedPointers.remove(name);
    if (ptr != null) {
      calloc.free(ptr);
      _allocatedPointers.remove(ptr);
    }
  }

  // 获取命名指针
  static Pointer<T>? getNamedPointer<T extends NativeType>(String name) {
    final ptr = _namedPointers[name];
    return ptr?.cast<T>();
  }

  // 清理内存泄漏
  static void _cleanup() {
    // 检查内存泄漏
    if (_allocatedPointers.length > 1000) {
      print('Warning: Potential memory leak detected. ${_allocatedPointers.length} pointers allocated.');
    }
  }

  // 释放所有内存
  static void deallocateAll() {
    for (final ptr in _allocatedPointers) {
      calloc.free(ptr);
    }
    _allocatedPointers.clear();
    _namedPointers.clear();
    _cleanupTimer?.cancel();
  }

  // 获取内存使用统计
  static Map<String, dynamic> getMemoryStats() {
    return {
      'allocatedPointers': _allocatedPointers.length,
      'namedPointers': _namedPointers.length,
    };
  }
}

2. 智能指针包装

dart

// 智能指针包装类
class SmartPointer<T extends NativeType> {
  final Pointer<T> _ptr;
  final void Function(Pointer<T>) _deleter;
  bool _disposed = false;

  SmartPointer(this._ptr, this._deleter);

  // 获取原始指针
  Pointer<T> get pointer {
    _checkDisposed();
    return _ptr;
  }

  // 解引用
  T get value {
    _checkDisposed();
    return _ptr.ref;
  }

  set value(T value) {
    _checkDisposed();
    _ptr.ref = value;
  }

  // 释放资源
  void dispose() {
    if (!_disposed) {
      _deleter(_ptr);
      _disposed = true;
    }
  }

  void _checkDisposed() {
    if (_disposed) {
      throw StateError('SmartPointer has been disposed');
    }
  }
}

// 智能指针工厂
class SmartPointerFactory {
  // 创建智能指针
  static SmartPointer<T> create<T extends NativeType>(
    Pointer<T> ptr, {
    void Function(Pointer<T>)? deleter,
  }) {
    return SmartPointer<T>(ptr, deleter ?? calloc.free);
  }

  // 创建数组智能指针
  static SmartPointer<T> createArray<T extends NativeType>(
    Pointer<T> ptr,
    int length, {
    void Function(Pointer<T>)? deleter,
  }) {
    return SmartPointer<T>(ptr, deleter ?? (p) => calloc.free(p));
  }

  // 创建字符串智能指针
  static SmartPointer<Char> createString(String str) {
    final ptr = str.toNativeUtf8().cast<Char>();
    return SmartPointer<Char>(ptr, (p) => calloc.free(p.cast<Uint8>()));
  }
}

异步操作

1. 异步 FFI 调用

dart

// 异步FFI调用管理器
class AsyncFFICaller {
  static final Map<String, Completer<dynamic>> _pendingCalls = {};
  static int _callId = 0;

  // 异步调用C函数
  static Future<T> callAsync<T extends Function>(
    DynamicLibrary library,
    String functionName,
    List<dynamic> arguments,
  ) async {
    final callId = 'call_${++_callId}';
    final completer = Completer<T>();
    _pendingCalls[callId] = completer;

    // 在隔离区中执行FFI调用
    await Isolate.spawn(_executeInIsolate, {
      'callId': callId,
      'libraryPath': library.toString(),
      'functionName': functionName,
      'arguments': arguments,
    });

    return await completer.future;
  }

  // 在隔离区中执行FFI调用
  static void _executeInIsolate(Map<String, dynamic> params) async {
    final callId = params['callId'] as String;
    final functionName = params['functionName'] as String;
    final arguments = params['arguments'] as List<dynamic>;

    try {
      // 执行FFI调用
      final result = await _performFFICall(functionName, arguments);

      // 发送结果回主线程
      SendPort? sendPort = _pendingCalls[callId] as SendPort?;
      if (sendPort != null) {
        sendPort.send({
          'callId': callId,
          'success': true,
          'result': result,
        });
      }
    } catch (e) {
      // 发送错误回主线程
      SendPort? sendPort = _pendingCalls[callId] as SendPort?;
      if (sendPort != null) {
        sendPort.send({
          'callId': callId,
          'success': false,
          'error': e.toString(),
        });
      }
    }
  }

  // 执行FFI调用
  static Future<dynamic> _performFFICall(String functionName, List<dynamic> arguments) async {
    // 实现具体的FFI调用逻辑
    return null;
  }

  // 处理隔离区返回的结果
  static void _handleIsolateResponse(Map<String, dynamic> response) {
    final callId = response['callId'] as String;
    final completer = _pendingCalls.remove(callId);

    if (completer != null) {
      if (response['success'] as bool) {
        completer.complete(response['result']);
      } else {
        completer.completeError(Exception(response['error'] as String));
      }
    }
  }
}

2. 回调函数处理

dart

// 回调函数管理器
class CallbackManager {
  static final Map<String, Pointer<NativeFunction>> _callbacks = {};
  static int _callbackId = 0;

  // 注册回调函数
  static String registerCallback<T extends Function>(Function callback) {
    final callbackId = 'callback_${++_callbackId}';
    final nativeCallback = Pointer.fromFunction<T>(callback);
    _callbacks[callbackId] = nativeCallback;
    return callbackId;
  }

  // 获取回调函数指针
  static Pointer<NativeFunction>? getCallback(String callbackId) {
    return _callbacks[callbackId];
  }

  // 注销回调函数
  static void unregisterCallback(String callbackId) {
    _callbacks.remove(callbackId);
  }

  // 释放所有回调
  static void disposeAll() {
    _callbacks.clear();
  }
}

// 回调函数示例
class ProgressCallback {
  static void Function(int)? _dartCallback;

  // 注册进度回调
  static String registerProgressCallback(void Function(int) callback) {
    _dartCallback = callback;
    return CallbackManager.registerCallback<NativeFunction<Void Function(Int32)>>(_nativeProgressCallback);
  }

  // 原生回调函数
  static void _nativeProgressCallback(int progress) {
    _dartCallback?.call(progress);
  }

  // 清理回调
  static void dispose() {
    _dartCallback = null;
    CallbackManager.disposeAll();
  }
}

性能优化

1. 批量操作优化

dart

// 批量操作优化器
class BatchOperationOptimizer {
  static const int _batchSize = 1000;
  static final List<Map<String, dynamic>> _pendingOperations = [];
  static Timer? _batchTimer;

  // 添加操作到批处理队列
  static void addOperation(String operation, Map<String, dynamic> params) {
    _pendingOperations.add({
      'operation': operation,
      'params': params,
      'timestamp': DateTime.now().millisecondsSinceEpoch,
    });

    if (_pendingOperations.length >= _batchSize) {
      _processBatch();
    } else if (_batchTimer == null) {
      _batchTimer = Timer(Duration(milliseconds: 16), _processBatch); // 60 FPS
    }
  }

  // 处理批量操作
  static void _processBatch() {
    if (_pendingOperations.isEmpty) return;

    _batchTimer?.cancel();
    _batchTimer = null;

    final batch = List<Map<String, dynamic>>.from(_pendingOperations);
    _pendingOperations.clear();

    // 在隔离区中处理批量操作
    Isolate.spawn(_processBatchInIsolate, batch);
  }

  // 在隔离区中处理批量操作
  static void _processBatchInIsolate(List<Map<String, dynamic>> batch) {
    for (final operation in batch) {
      _executeOperation(operation['operation'], operation['params']);
    }
  }

  // 执行单个操作
  static void _executeOperation(String operation, Map<String, dynamic> params) {
    // 实现具体的操作执行逻辑
  }

  // 强制处理所有待处理操作
  static void flush() {
    _batchTimer?.cancel();
    _batchTimer = null;
    _processBatch();
  }
}

2. 缓存优化

dart

// FFI缓存优化器
class FFICacheOptimizer {
  static final Map<String, CacheEntry> _cache = {};
  static const int _maxCacheSize = 1000;
  static const Duration _cacheTimeout = Duration(minutes: 5);

  // 缓存条目
  static class CacheEntry {
    final dynamic data;
    final DateTime timestamp;

    CacheEntry(this.data) : timestamp = DateTime.now();

    bool get isExpired => DateTime.now().difference(timestamp) > _cacheTimeout;
  }

  // 获取缓存数据
  static T? getCachedData<T>(String key) {
    final entry = _cache[key];
    if (entry != null && !entry.isExpired) {
      return entry.data as T?;
    } else {
      _cache.remove(key);
      return null;
    }
  }

  // 设置缓存数据
  static void setCachedData<T>(String key, T data) {
    _cache[key] = CacheEntry(data);

    // 检查缓存大小
    if (_cache.length > _maxCacheSize) {
      _evictOldestEntries();
    }
  }

  // 清理过期条目
  static void cleanupExpiredEntries() {
    final expiredKeys = <String>[];
    _cache.forEach((key, entry) {
      if (entry.isExpired) {
        expiredKeys.add(key);
      }
    });

    for (final key in expiredKeys) {
      _cache.remove(key);
    }
  }

  // 驱逐最旧的条目
  static void _evictOldestEntries() {
    final sortedEntries = _cache.entries.toList()
      ..sort((a, b) => a.value.timestamp.compareTo(b.value.timestamp));

    final entriesToRemove = sortedEntries.take(_cache.length - _maxCacheSize);
    for (final entry in entriesToRemove) {
      _cache.remove(entry.key);
    }
  }

  // 清空缓存
  static void clearCache() {
    _cache.clear();
  }
}

错误处理

1. 异常处理

dart

// FFI异常处理器
class FFIExceptionHandler {
  static final Map<int, String> _errorCodes = {
    0: 'Success',
    1: 'Invalid argument',
    2: 'Memory allocation failed',
    3: 'Null pointer',
    4: 'Buffer overflow',
    5: 'File not found',
    6: 'Permission denied',
    7: 'Network error',
    8: 'Timeout',
    9: 'Unknown error',
  };

  // 检查FFI返回值
  static void checkReturnValue(int returnValue, [String? operation]) {
    if (returnValue != 0) {
      final errorMessage = _errorCodes[returnValue] ?? 'Unknown error code: $returnValue';
      throw FFIException(
        code: returnValue,
        message: errorMessage,
        operation: operation,
      );
    }
  }

  // 检查指针有效性
  static void checkPointer<T extends NativeType>(Pointer<T>? pointer, [String? name]) {
    if (pointer == nullptr) {
      throw FFIException(
        code: 3,
        message: 'Null pointer encountered${name != null ? ' for $name' : ''}',
      );
    }
  }

  // 包装FFI调用
  static T wrapFFICall<T>(T Function() ffiCall, [String? operation]) {
    try {
      return ffiCall();
    } catch (e) {
      if (e is FFIException) {
        rethrow;
      } else {
        throw FFIException(
          code: 9,
          message: 'FFI call failed: $e',
          operation: operation,
        );
      }
    }
  }
}

// FFI异常类
class FFIException implements Exception {
  final int code;
  final String message;
  final String? operation;

  FFIException({
    required this.code,
    required this.message,
    this.operation,
  });

  @override
  String toString() {
    final buffer = StringBuffer('FFIException($code): $message');
    if (operation != null) {
      buffer.write(' (operation: $operation)');
    }
    return buffer.toString();
  }
}

最佳实践

1. 架构设计

分层设计：将 FFI 代码分为接口层、绑定层和实现层
类型安全：使用强类型确保 FFI 调用的安全性
资源管理：建立完善的内存和资源管理机制
错误处理：实现全面的错误处理和恢复机制

2. 性能优化

批量操作：将多个小操作合并为批量操作
缓存策略：合理使用缓存减少 FFI 调用次数
异步处理：使用隔离区处理耗时的 FFI 操作
内存优化：及时释放不需要的内存资源

3. 开发建议

代码生成：使用 ffigen 等工具自动生成绑定代码
测试覆盖：编写全面的单元测试和集成测试
文档完善：详细记录 FFI 接口和使用方法
跨平台兼容：确保 FFI 代码在各平台上的兼容性

总结

Flutter FFI 桥接技术为 Flutter 应用提供了直接调用 C/C++代码的能力，是实现高性能原生集成的重要手段。通过掌握 FFI 的基础知识、内存管理、异步操作和性能优化等技术，开发者可以构建出功能强大、性能卓越的 Flutter 应用。

关键成功因素：

深入理解 FFI 工作机制
合理设计绑定架构
重视内存管理
实现完善的错误处理
持续优化性能

通过本文的学习，开发者应该能够充分利用 Flutter FFI 桥接技术，构建出高质量的跨平台应用。

Flutter FFI 桥接技术 ​

概述 ​

FFI 基础 ​

1. 环境配置 ​

2. 基础类型映射 ​

3. 动态库加载 ​

C/C++集成 ​

1. C 函数绑定 ​

2. C++类绑定 ​

内存管理 ​

1. 自动内存管理 ​

2. 智能指针包装 ​

异步操作 ​

1. 异步 FFI 调用 ​

2. 回调函数处理 ​

性能优化 ​

1. 批量操作优化 ​

2. 缓存优化 ​

错误处理 ​

1. 异常处理 ​

最佳实践 ​

1. 架构设计 ​

2. 性能优化 ​

3. 开发建议 ​

总结 ​

Flutter FFI 桥接技术

概述

FFI 基础

1. 环境配置

2. 基础类型映射

3. 动态库加载

C/C++集成

1. C 函数绑定

2. C++类绑定

内存管理

1. 自动内存管理

2. 智能指针包装

异步操作

1. 异步 FFI 调用

2. 回调函数处理

性能优化

1. 批量操作优化

2. 缓存优化

错误处理

1. 异常处理

最佳实践

1. 架构设计

2. 性能优化

3. 开发建议

总结