flutter中调用C++的库

Dart调用C++的库

1. 安装ffi库 flutter pub add ffi
2. 如果是C++必须使用C的方式导出接口

import 'dart:ffi';
import 'dart:io';
import "package:ffi/ffi.dart";

final DynamicLibrary ff = Platform.isWindows
    ? DynamicLibrary.open("live666.dll")
    : throw UnsupportedError("only Windows is supported");

// 定义 C 函数的签名
typedef CLive666Init = Pointer<Void> Function(Pointer<Utf8>, Pointer<Utf8>);

// 定义 Dart 函数的签名
typedef DartLive666Init = Pointer<Void> Function(Pointer<Utf8>, Pointer<Utf8>);

// 查找并绑定函数
final live666Init = ff.lookupFunction<CLive666Init, DartLive666Init>('live666_init');

3. 调用

  void _invokeCpp(){
    try{
      debugPrint("Current working directory: ${Directory.current.path}");

      final handle = live666Init(url, reg);
      if (handle.address == 0) {
        debugPrint("Initialization failed, null pointer returned.");
      } else {
        debugPrint("Initialization succeeded, handle: 0x${handle.address.toRadixString(16)}");
      }
    } on UnsupportedError{
      debugPrint("没有找到动态库");
    }
    malloc.free(url);
    malloc.free(reg);
  }