Sdk: String.fromEnvironment() and environment variables

[sgrekhov]

How to get (or set) environment variable in Dart, which is accessible for String.fromEnvironment()? I'm doing the following:

import "dart:io";

main() {
  Map<String, String> env = Platform.environment;
  print(env["NUMBER_OF_PROCESSORS"]); // prints 12
  var s = new String.fromEnvironment("NUMBER_OF_PROCESSORS", defaultValue: "No");
  print(s); // prints No
}

Is this a bug, or I'm doing anything wrong? If environment variables from Platform.environment are not seen for String.fromEnvironment() then how to get (or set) environment variables which will work with String.fromEnvironment()?

I'm using Windows 7 and Dart VM version: 1.21.0-dev.11.3 (Mon Dec 05 02:56:25 2016) on "windows_x64"

[a14n]

See #27585

new String.fromEnvironment("NUMBER_OF_PROCESSORS", defaultValue: "No") will retrieve the parameter provided by dart -DNUMBER_OF_PROCESSORS=2314 myProg.dart

[hentoesch]

with String.fromEnvironment() you can query variables passed to a dart program.

e.g pub build --define PRODUCTION=true

in code ...
var production=String.fromEnvironment("PRODUCTION")

[sgrekhov]

Thank you! Now it's clean