Question

我正在尝试按照示例将 C 文件与 Flutter 应用程序链接。不幸的是，我发现的所有示例都只提供了完整工具链的一部分。目前，我遇到了上述错误，我尝试按照此处 Xcode 12, building for iOS Simulator, but linking in object file built for iOS, for architecture arm64 的建议删除 arm64，但这没有帮助。

我正在尝试遵循 https://dart.dev/guides/libraries/c-interop

中的“原始”示例

我所做的（正如我所说，我正在关注多个示例，所以不确定这条链是否有意义）：

(1) 我新建了一个flutter项目

import 'dart:ffi';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:native_add_bin/primitives.dart';
import 'dart:io' show Platform;
import 'package:ffi/ffi.dart';

// C sum function - int sum(int a, int b);
// Example of how to pass parameters into C and use the returned result
typedef sum_func = Int32 Function(Int32 a, Int32 b);
typedef Sum = int Function(int a, int b);

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  var dylib, sumPointer, sum;


    final path = './primitives_library/libprimitives.dylib';
  @override
  void initState() {
     dylib = DynamicLibrary.open(path);

    // calls int sum(int a, int b);
     sumPointer = dylib.lookup<NativeFunction<sum_func>>('sum');
     sum = sumPointer.asFunction<Sum>();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Column(
            children: [Text('Running on: $_platformVersion\n'),
              Text('1 + 2 == ${sum(1, 2)}')
            ]
        ),
      ),
    );
  }
}

(2) 然后，我用示例中的 CMakeLists.txt 文件编译了 C 文件

$ cmake . -GXcode -DCMAKE_SYSTEM_NAME=iOS

$ cmake -S. -B_builds -GXcode -DCMAKE_SYSTEM_NAME=iOS "-DCMAKE_OSX_ARCHITECTURES=armv7;armv7s;arm64;i386;x86_64" -DCMAKE_OSX_DEPLOYMENT_TARGET=9.3 -DCMAKE_INSTALL_PREFIX=../_install -DCMAKE_XCODE_ATTRIBUTE_ONLY_ACTIVE_ARCH=NO -DCMAKE_IOS_INSTALL_COMBINED=YES

$ cmake --build _builds --config Debug --target install

这是基于以下描述：https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html#cross-compiling-for-ios-tvos-or-watchos

(3) 在 Xcode 中，我已经为项目 Runner 和目标 Runner 排除了（架构）arm64，用于调试、配置文件和发布，并带有选项 Any iOS Simulator SDK。

对于第 (3) 点，我不确定是否需要为 Pod 项目重复此操作，因为我没有 Pod 文件。

(4) 我正在从 Intellij Idea 启动调试器并收到以下结果：

Xcode build done.                                            7,0s
Failed to build iOS app
Error output from Xcode build:
↳
    ** BUILD FAILED **


Xcode's output:
↳
    note: Using new build system
    note: Building targets in parallel
    note: Planning build
    note: Constructing build description
    error: Building for iOS Simulator, but the linked and embedded library 'libmyproject.dylib' was built for iOS. (in target 'Runner' from project 'Runner')

我需要对这个 pod 文件做些什么还是我有其他问题？

绑定二进制文件失败“为 iOS 模拟器构建，但链接和嵌入的库‘libmyproject.dylib’是为 iOS 构建的”

0 个答案: