在Dart中的库下读取静态文件？ [英] Reading static files under a library in Dart?

问题描述

我在Dart写一个库，我的库文件夹下有静态文件。我想要能够读取这些文件，但我不知道如何检索到它的路径...没有 __ FILE __ 或

$ b 更新：似乎我不够清楚。让我们帮助您理解我：

test.dart

  import'foo.dart'; 
 
 void main（）{
 print（Foo.getMyPath（））; 
} 
  

foo.dart
$ b

  library asd; 
 
 class Foo {
 static Path getMyPath（）=>新路径（'resources /'）; 
} 
  

它给我错误的文件夹位置。它给了我的路径 test.dart + resources / ，但我想要的路径 foo.dart + resources / 。

解决方案

如前所述，您可以使用镜像。以下是使用您希望实现的示例：

test.dart

$ b b

  import'foo.dart'; 
 
 void main（）{
 print（Foo.getMyPath（））; 
} 
  

foo.dart
$ b

  library asd; 
 
 import'dart：mirrors'; 
 
 class Foo {
 static Path getMyPath（）=> new Path（'$ {currentMirrorSystem（）。libraries ['asd']。url} / resources /'）; 
} 
  

它应该输出：

/ Users / Kai / test / lib / resources /

一个更好的方法来做到这一点在未来的版本。

更新：您还可以在库中定义一个私有方法：

  / ** 
 *返回此库根目录的路径。 
 * / 
 _getRootPath（）{
 var pathString = new Path（currentMirrorSystem（）。libraries ['LIBNAME']。url）.directoryPath.toString（）。replaceFirst //'，''）; 
 return pathString; 
} 
  

I am writing a library in Dart and I have static files under the library folder. I want to be able to read those files, but I'm not sure how to retrieve the path to it... there is not __FILE__ or $0 like in some other languages.

Update: It seems that I was not clear enough. Let this help you understand me:

test.dart

import 'foo.dart';

void main() {
  print(Foo.getMyPath());
}

foo.dart

library asd;

class Foo {
  static Path getMyPath() => new Path('resources/');
}

It gives me the wrong folder location. It gives me the path to test.dart + resources/, but I want the path to foo.dart + resources/.

解决方案

As mentioned, you can use mirrors. Here's an example using what you wanted to achieve:

test.dart

import 'foo.dart';

void main() {
  print(Foo.getMyPath());
}

foo.dart

library asd;

import 'dart:mirrors';

class Foo {
  static Path getMyPath() => new Path('${currentMirrorSystem().libraries['asd'].url}/resources/');
}

It should output something like:

/Users/Kai/test/lib/resources/

There will probably be a better way to do this in a future release. I will update the answer when this is the case.

Update: You could also define a private method in the library:

/**
 * Returns the path to the root of this library.
 */
_getRootPath() {
  var pathString = new Path(currentMirrorSystem().libraries['LIBNAME'].url).directoryPath.toString().replaceFirst('file:///', '');
  return pathString;
}

这篇关于在Dart中的库下读取静态文件？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！