无法分别构建FightWeb和Ffltter移动应用程序 [英] Unable to build Flutter Web and Flutter Mobile apps seperately
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问题描述
我正在构建一个颤动项目，在单个项目中集成Web和移动代码时遇到了一个问题。我想在我的移动代码中使用Moor和Moor_FFI，但即使我的Web(main.dart)和移动代码(main.dev.dart)的入口点被配置为不同于调试，它仍然尝试为Web编译移动代码。这会导致问题，因为Ffltter Web目前不支持FFI和其他DART插件，从而导致大量错误消息。
Error compiling dartdevc module:ffi|lib/ffi.ddc.js
packages/ffi/src/utf8.dart:6:8: Error: Not found: 'dart:ffi'
import 'dart:ffi';
^
packages/ffi/src/utf16.dart:6:8: Error: Not found: 'dart:ffi'
import 'dart:ffi';
^
packages/ffi/src/allocation.dart:5:8: Error: Not found: 'dart:ffi'
import 'dart:ffi';
^
packages/ffi/src/utf8.dart:23:20: Error: Type 'Struct' not found.
class Utf8 extends Struct {
^^^^^^
packages/ffi/src/utf8.dart:26:21: Error: Type 'Pointer' not found.
static int strlen(Pointer<Utf8> string) {
^^^^^^^
packages/ffi/src/utf8.dart:26:21: Error: Expected 0 type arguments.
static int strlen(Pointer<Utf8> string) {
^
packages/ffi/src/utf8.dart:41:26: Error: Type 'Pointer' not found.
static String fromUtf8(Pointer<Utf8> string) {
^^^^^^^
packages/ffi/src/utf8.dart:41:26: Error: Expected 0 type arguments.
static String fromUtf8(Pointer<Utf8> string) {
^
packages/ffi/src/utf8.dart:54:10: Error: Type 'Pointer' not found.
static Pointer<Utf8> toUtf8(String string) {
^^^^^^^
packages/ffi/src/utf8.dart:54:10: Error: Expected 0 type arguments.
static Pointer<Utf8> toUtf8(String string) {
^
packages/ffi/src/utf16.dart:16:21: Error: Type 'Struct' not found.
class Utf16 extends Struct {
^^^^^^
packages/ffi/src/utf16.dart:24:10: Error: Type 'Pointer' not found.
static Pointer<Utf16> toUtf16(String s) {
^^^^^^^
packages/ffi/src/utf16.dart:24:10: Error: Expected 0 type arguments.
static Pointer<Utf16> toUtf16(String s) {
^
packages/ffi/src/allocation.dart:9:7: Error: Type 'DynamicLibrary' not found.
final DynamicLibrary stdlib = Platform.isWindows
^^^^^^^^^^^^^^
packages/ffi/src/allocation.dart:13:29: Error: Type 'Pointer' not found.
typedef PosixMallocNative = Pointer Function(IntPtr);
^^^^^^^
packages/ffi/src/allocation.dart:13:46: Error: Type 'IntPtr' not found.
typedef PosixMallocNative = Pointer Function(IntPtr);
^^^^^^
packages/ffi/src/allocation.dart:14:23: Error: Type 'Pointer' not found.
typedef PosixMalloc = Pointer Function(int);
^^^^^^^
packages/ffi/src/allocation.dart:18:27: Error: Type 'Void' not found.
typedef PosixFreeNative = Void Function(Pointer);
^^^^
packages/ffi/src/allocation.dart:18:41: Error: Type 'Pointer' not found.
typedef PosixFreeNative = Void Function(Pointer);
^^^^^^^
packages/ffi/src/allocation.dart:19:35: Error: Type 'Pointer' not found.
typedef PosixFree = void Function(Pointer);
^^^^^^^
packages/ffi/src/allocation.dart:23:31: Error: Type 'Pointer' not found.
typedef WinGetProcessHeapFn = Pointer Function();
^^^^^^^
packages/ffi/src/allocation.dart:26:7: Error: Type 'Pointer' not found.
final Pointer processHeap = winGetProcessHeap();
^^^^^^^
And so on.....
是否可以将编译器配置为仅为各自的运行生成与Web或Mobile相关的文件？
参考：GitHub Repo With Error Recorated：https://github.com/JoshMarkF/MoorFFIIntegrationDemo
推荐答案
编辑
flutter build web和flutter run -d chrome都工作正常。
由于web用户界面代码(webui.dart)和移动用户界面代码(mobileui.dart)位于不同的DART文件中，
因此这两个文件可以具有不同import
main.dart、webui.dart和mobileui.dart
您可以使用conditional import将web和移动端的不同工具分开因此网络和移动可以有完全不同的逻辑
带有前缀的代码片段调用multiPlatform
import 'mobileui.dart' if (dart.library.html) 'webui.dart' as multiPlatform;
...
home: multiPlatform.TestPlugin(),
使用Android Studio与Android Emulator和Chrome运行时的工作演示
main.dart
import 'package:flutter/material.dart';
import 'mobileui.dart' if (dart.library.html) 'webui.dart' as multiPlatform;
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: multiPlatform.TestPlugin(),
);
}
}
mobileui.dart
import 'package:flutter/material.dart';
class TestPlugin extends StatefulWidget {
@override
_TestPluginState createState() => _TestPluginState();
}
class _TestPluginState extends State<TestPlugin> {
@override
Widget build(BuildContext context) {
return Text("Mobile");
}
}
webui.dart
import 'package:flutter/material.dart';
import 'dart:html' as html;
import 'dart:js' as js;
import 'dart:ui' as ui;
class TestPlugin extends StatefulWidget {
TestPlugin();
_TestPluginState createState() => _TestPluginState();
}
class _TestPluginState extends State<TestPlugin> {
String createdViewId = 'map_element';
@override
void initState() {
// ignore: undefined_prefixed_name
ui.platformViewRegistry.registerViewFactory(
createdViewId,
(int viewId) => html.IFrameElement()
..width = MediaQuery.of(context).size.width.toString() //'800'
..height = MediaQuery.of(context).size.height.toString() //'400'
..srcdoc = """<!DOCTYPE html><html>
<head><title>Page Title</title></head><body><h1>This is a Heading</h1><p>This is a paragraph.</p></body></html>"""
/*..src = "http://f12apidev32.umc.com/Tableau/jsapi_practice.aspx"*/
..style.border = 'none');
super.initState();
}
@override
void dispose() {
super.dispose();
}
@override
Widget build(BuildContext context) {
return Container(
padding: EdgeInsets.symmetric(horizontal: 10),
decoration: BoxDecoration(
color: Colors.white,
border: Border.all(color: Colors.grey[300], width: 1),
borderRadius: BorderRadius.all(Radius.circular(5))),
width: 200,
height: 200,
child: Directionality(
textDirection: TextDirection.ltr,
child: HtmlElementView(
viewType: createdViewId,
)));
}
}
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