无法发布应用程序或构建web，因为这个包: blue_thermal_printer：^1.1.9

Question

当我运行这个命令时

flutter run --release
flutter build web --web-renderer html

我在控制台中得到了这个错误：

Launching lib\main.dart on Infinix X656 in release mode...
/C:/Users/Bilal%20Saeed/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/blue_thermal_printer-1.1.9/lib/blue_thermal_printer.dart:34:28: Error: Type 'Registrar' not
 found.
  static void registerWith(Registrar registrar) {
                           ^^^^^^^^^
/C:/Users/Bilal%20Saeed/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/blue_thermal_printer-1.1.9/lib/blue_thermal_printer.dart:34:28: Error: 'Registrar' isn't a
type.
  static void registerWith(Registrar registrar) {
                           ^^^^^^^^^
/C:/Users/Bilal%20Saeed/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/blue_thermal_printer-1.1.9/lib/blue_thermal_printer.dart:35:24: Error: Setter not found: 'i
nstance'.
    BlueThermalPrinter.instance = BlueThermalPrinter._();
                       ^^^^^^^^


FAILURE: Build failed with an exception.

* Where:
Script 'D:\All Data\Softwares\Latest Flutter\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 1005

* What went wrong:
Execution failed for task ':app:compileFlutterBuildRelease'.
> Process 'command 'D:\All Data\Softwares\Latest Flutter\flutter\bin\flutter.bat'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 3m 57s
Running Gradle task 'assembleRelease'...                          240.3s
Exception: Gradle task assembleRelease failed with exit code 1

此文件还会自动生成错误：

//
// Generated file. Do not edit.
//

// ignore_for_file: directives_ordering
// ignore_for_file: lines_longer_than_80_chars

import 'package:blue_thermal_printer/';
import 'package:cloud_firestore_web/cloud_firestore_web.dart';
import 'package:cloud_functions_web/cloud_functions_web.dart';
import 'package:connectivity_for_web/connectivity_for_web.dart';
import 'package:firebase_analytics_web/firebase_analytics_web.dart';
import 'package:firebase_auth_web/firebase_auth_web.dart';
import 'package:firebase_core_web/firebase_core_web.dart';
import 'package:firebase_messaging_web/firebase_messaging_web.dart';
import 'package:firebase_storage_web/firebase_storage_web.dart';
import 'package:fluttertoast/fluttertoast_web.dart';
import 'package:geolocator_web/geolocator_web.dart';
import 'package:google_maps_flutter_web/google_maps_flutter_web.dart';
import 'package:google_sign_in_web/google_sign_in_web.dart';
import 'package:image_picker_for_web/image_picker_for_web.dart';
import 'package:maps_launcher/maps_launcher_web.dart';
import 'package:shared_preferences_web/shared_preferences_web.dart';
import 'package:url_launcher_web/url_launcher_web.dart';
import 'package:video_player_web/video_player_web.dart';

import 'package:flutter_web_plugins/flutter_web_plugins.dart';

// ignore: public_member_api_docs
void registerPlugins(Registrar registrar) {
  BlueThermalPrinterPlugin.registerWith(registrar);
  FirebaseFirestoreWeb.registerWith(registrar);
  FirebaseFunctionsWeb.registerWith(registrar);
  ConnectivityPlugin.registerWith(registrar);
  FirebaseAnalyticsWeb.registerWith(registrar);
  FirebaseAuthWeb.registerWith(registrar);
  FirebaseCoreWeb.registerWith(registrar);
  FirebaseMessagingWeb.registerWith(registrar);
  FirebaseStorageWeb.registerWith(registrar);
  FluttertoastWebPlugin.registerWith(registrar);
  GeolocatorPlugin.registerWith(registrar);
  GoogleMapsPlugin.registerWith(registrar);
  GoogleSignInPlugin.registerWith(registrar);
  ImagePickerPlugin.registerWith(registrar);
  MapsLauncherWeb.registerWith(registrar);
  SharedPreferencesPlugin.registerWith(registrar);
  UrlLauncherPlugin.registerWith(registrar);
  VideoPlayerPlugin.registerWith(registrar);
  registrar.registerMessageHandler();
}

我也经常在飞镖分析中看到这些错误：

error: Target of URI doesn't exist: 'package:blue_thermal_printer/'. (uri_does_not_exist at [food_delivery_app] lib\generated_plugin_registrant.dart:8)
error: Undefined name 'BlueThermalPrinterPlugin'. (undefined_identifier at [food_delivery_app] lib\generated_plugin_registrant.dart:31)

然而，在调试模式下，应用程序工作正常。当我删除bluetooth_thermal_print包时，它也可以正常工作。有什么问题吗？如何用这个包发布我的应用程序？

Answer 1

似乎没有正确安装这个插件。

确保pubspec.yaml具有所列的依赖项：

dependencies:
  blue_thermal_printer: ^any

然后，您可以让它获取文件：

flutter packages get

另一方面，您正在创建一个web项目，然后安装一个插件，这可能更适合于安卓、iOS或HarmonyOS。flutter config --no-enable-web将禁用web支持，这可能(甚至很可能)是导致错误消息的原因之一。

即使某些库可以在web浏览器中提供这种功能。

没有所有抽象层，任何类型的ESC/POS都可能更容易处理。

你可能想跟进#103 ...which的问题，这只证实了我的猜测。

Answer 2

去找这个包的开发人员。我亲自联系了他，查阅了他在pub.dev上的投资组合，并告诉了他情况。他在大约几分钟内将软件包从bluetooth_thermal_printer 1.1.9更新到1.2.0，一切又顺利地进行了一次.