How to get Dart native extension demo "sample_extension" to work? -

i trying dart native extension example page work.

http://www.dartlang.org/articles/native-extensions-for-standalone-dart-vm/

i on windows. downloaded , extracted dart c:\program files\dart

i checked out dartssvn c:\projects\dartsvn can sample_extention project when open analyzer throws these problems:

"target of uri not exist: 'dart-ext:sample_extension'"

and

"native functions can declared in sdk , code loaded through native extensions"

and when try run

"cannot find extension library 'file:///c:/projects/dart/sample_extension/bin/sample_synchronous_extension.dart': error: line 7 pos 1: library handler failed import 'dart-ext:sample_extension';

'file:///c:/projects/dart/sample_extension/bin/test_sample_synchronous_extension.dart': error: line 7 pos 1: library handler failed import 'sample_synchronous_extension.dart';"

what doing wrong?

you can ignore analyzer error time. seems bug/issue current dart version.

the error "cannot find extension library... means dart vm can not find "sample_extension.dll" file inside project folder. must compile c++ source code of sample generate library (dll under windows).

the article native extensions has section called building on windows. follow instructions.