Flutter：如何解决系统找不到指定的路径

Posted 2023-02-23

【中文标题】Flutter：如何解决系统找不到指定的路径

【英文标题】：Flutter:How to solve system can not find the path Specified

【发布时间】：2021-05-30 13:20:11

【问题描述】：

我一直在开发一个 Flutter 应用，最近安装了三个与 firebase 相关的 pacakges firebase_core、cloud_firestore 和 firebase_storage。但安装后，当我尝试将它们导入 .dart 文件时，我面临“系统找不到指定的路径”

导入'包：quiver/core.dart';'错误。那我该怎么办，这是我的 pubspec.yaml 文件。如果可以修复错误，我什至尝试将 quiver 添加到 pubspec.yaml，但它没有。

name: bookecommerceapp
description: A new Flutter project.

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In ios, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.22.6

environment:
  sdk: ">=2.1.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.2
  google_fonts: any
  http: ^0.12.2
  provider: ^4.3.3
  search_page: ^1.4.0
  loading: ^1.0.2
  file_picker: ^2.1.6
  firebase_core: ^0.7.0
  cloud_firestore: ^0.16.0+1
  firebase_storage: ^7.0.0
  quiver: ^2.1.5


dev_dependencies:
  flutter_test:
    sdk: flutter


# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  assets:
    - images/
    - google_fonts/
#    - imagesa_dot_ham.jpeg

  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.dev/assets-and-images/#resolution-aware.

  # For details regarding adding assets from package dependencies, see
  # https://flutter.dev/assets-and-images/#from-packages

  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  fonts:
    - family: OpenSans
      fonts:
        - asset: google_fonts/OpenSans-Bold.ttf
        - asset: google_fonts/OpenSans-Bolditalic.ttf
        - asset: google_fonts/OpenSans-ExtraBold.ttf
        - asset: google_fonts/OpenSans-ExtraBoldItalic.ttf
        - asset: google_fonts/OpenSans-Light.ttf
        - asset: google_fonts/OpenSans-Regular.ttf

  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.dev/custom-fonts/#from-packages

这是我的完整错误堆栈跟踪

Performing hot reload...
Syncing files to device Android SDK built for x86...
/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_storage-7.0.0/lib/firebase_storage.dart:11:8: Error: Error when reading '/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/quiver-2.1.5/lib/core.dart': The system cannot find the path specified.

import 'package:quiver/core.dart';
       ^
/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core-0.7.0/lib/firebase_core.dart:10:8: Error: Error when reading '/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/quiver-2.1.5/lib/core.dart': The system cannot find the path specified.

import 'package:quiver/core.dart';
       ^
/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core_platform_interface-3.0.1/lib/firebase_core_platform_interface.dart:15:8: Error: Error when reading '/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/quiver-2.1.5/lib/core.dart': The system cannot find the path specified.

import 'package:quiver/core.dart';
       ^
/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_storage-7.0.0/lib/src/firebase_storage.dart:168:23: Error: The method 'hash2' isn't defined for the class 'FirebaseStorage'.
 - 'FirebaseStorage' is from 'package:firebase_storage/firebase_storage.dart' ('/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_storage-7.0.0/lib/firebase_storage.dart').
Try correcting the name to the name of an existing method, or defining a method named 'hash2'.
  int get hashCode => hash2(app.name, bucket);
                      ^^^^^
/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_storage-7.0.0/lib/src/reference.dart:211:23: Error: The method 'hash2' isn't defined for the class 'Reference'.
 - 'Reference' is from 'package:firebase_storage/firebase_storage.dart' ('/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_storage-7.0.0/lib/firebase_storage.dart').
Try correcting the name to the name of an existing method, or defining a method named 'hash2'.
  int get hashCode => hash2(storage, fullPath);
                      ^^^^^
/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_storage-7.0.0/lib/src/task_snapshot.dart:49:23: Error: The method 'hash2' isn't defined for the class 'TaskSnapshot'.
 - 'TaskSnapshot' is from 'package:firebase_storage/firebase_storage.dart' ('/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_storage-7.0.0/lib/firebase_storage.dart').
Try correcting the name to the name of an existing method, or defining a method named 'hash2'.
  int get hashCode => hash2(storage, ref);
                      ^^^^^
/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core-0.7.0/lib/src/firebase_app.dart:65:23: Error: The method 'hash2' isn't defined for the class 'FirebaseApp'.
 - 'FirebaseApp' is from 'package:firebase_core/firebase_core.dart' ('/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core-0.7.0/lib/firebase_core.dart').
Try correcting the name to the name of an existing method, or defining a method named 'hash2'.
  int get hashCode => hash2(name, options);
                      ^^^^^
/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core_platform_interface-3.0.1/lib/src/firebase_exception.dart:63:12: Error: The method 'hash3' isn't defined for the class 'FirebaseException'.
 - 'FirebaseException' is from 'package:firebase_core_platform_interface/firebase_core_platform_interface.dart' ('/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core_platform_interface-3.0.1/lib/firebase_core_platform_interface.dart').
Try correcting the name to the name of an existing method, or defining a method named 'hash3'.
    return hash3(plugin, code, message);
           ^^^^^
/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core_platform_interface-3.0.1/lib/src/firebase_options.dart:183:12: Error: The method 'hashObjects' isn't defined for the class 'FirebaseOptions'.
 - 'FirebaseOptions' is from 'package:firebase_core_platform_interface/firebase_core_platform_interface.dart' ('/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core_platform_interface-3.0.1/lib/firebase_core_platform_interface.dart').
Try correcting the name to the name of an existing method, or defining a method named 'hashObjects'.
    return hashObjects(asMap.entries);
           ^^^^^^^^^^^
/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core_platform_interface-3.0.1/lib/src/platform_interface/platform_interface_firebase_app.dart:64:23: Error: The method 'hash2' isn't defined for the class 'FirebaseAppPlatform'.
 - 'FirebaseAppPlatform' is from 'package:firebase_core_platform_interface/firebase_core_platform_interface.dart' ('/C:/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core_platform_interface-3.0.1/lib/firebase_core_platform_interface.dart').
Try correcting the name to the name of an existing method, or defining a method named 'hash2'.
  int get hashCode => hash2(name, options);
                      ^^^^^

P.s 当我只在这样的任何文件中导入它时会发生错误

import 'package:firebase_storage/firebase_storage.dart';

【问题讨论】：

hash2() 来自与firebase 包无关的quiver 包。你把import 'package:quiver/core.dart'; 放在你的文件里了吗？顺便说一句，您需要运行 flutter pub get 然后在添加新包后重建您的应用程序。热重载不会让你立即使用新包

我试过了，没用。我什至创建了另一个应用程序并向我显示了相同的错误消息，所以我重新安装了 Flutter，它现在可以工作了。

解决了升级flutter版本清缓存的问题。

【参考方案1】：

我也遇到了这个问题，并且遇到了几种可能导致它的情况。

第一个：这可能是您的环境变量中的损坏路径。您可以通过在终端中执行简单的“echo %PATH%”并删除那些不指向有效位置的路径来检查所有路径。

第二个：确保您的项目路径不包含“&”，如此处所述：https://github.com/flutter/flutter/issues/41547

第三个：我发现的另一个问题是，在卸载 Anaconda 后，它在命令处理器注册表中遗漏了一个 AutoRun 键（在您的情况下，它可能是 Firebase）。

在 regedit 中检查这些地方是否有损坏的链接： 计算机\HKEY_CURRENT_USER\软件\微软\命令处理器 计算机\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\命令处理器

【讨论】：

谢谢。 （第三个）解决了我的问题。