Clever Geek Handbook

Reading static files in a library in Dart?

I am writing a library in Dart and I have static files in the library folder. I want to be able to read these files, but I'm not sure how to get the path to it ... not there __FILE__

or $0

like in some other languages.

Update: It seems that I was not clear enough. May 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/');
}

This gives me the wrong folder location. This gives me a path to test.dart

+ resources/

, but I need a path to foo.dart

+ resources/

.

+2


source to share


3 answers


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 / Library / resources /

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

Update: . You can 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;
}
+4


source


The dart mirror API (still experimental and not available on all platforms like dart2js yet) provides the url verb in LibraryMirror . This should give you what you want.

I don't know of any other way to get this information in the library.



#import('dart:mirrors');
#import('package:mylib/mylib.dart'); 

main(){
   final urlOfLib = currentMirrorSystem().libraries['myLibraryName'].url;
}
+2


source


Usually the usual method to access resources that are in a static position with your library is using a relative path.

#import('dart:io');

...

var filePath = new Path('resources/cool.txt');
var file = new File.fromPath(filePath);

// And if you really wanted, you can then get the full path
// Note: below is for example only. It is missing various
// integrity checks like error handling.
file.fullPath.then((path_str) {
  print(path_str);
});

See more API information on Path and File

Aside. If you absolutely wanted to get the same type of output as __FILE__

, you can do something like the following:

#import('dart:io');
...
var opts = new Options();
var path = new Path(opts.script);
var file = new File.fromPath(path);
file.fullPath().then((path_str) {
  print(path_str);
});
+1


source






More articles:


All Articles