dart-isolates

问题 Here is a very simple code that I run using command line dart to demonstrate my point: import 'dart:isolate'; void isolateMain() { throw new Exception("ouch"); } bool handleException(IsolateUnhandledException e) { print("EXCEPTION in isolate: " + e.toString()); return true; } void main() { SendPort sendPort = spawnFunction(isolateMain, handleException); sendPort.call("Hello").then((e) { print("Main received " + e); }); } and the output: Exception: ouch #0 isolateMain (file:///Users/salomon

问题 Here is a very simple code that I run using command line dart to demonstrate my point: import 'dart:isolate'; void isolateMain() { throw new Exception("ouch"); } bool handleException(IsolateUnhandledException e) { print("EXCEPTION in isolate: " + e.toString()); return true; } void main() { SendPort sendPort = spawnFunction(isolateMain, handleException); sendPort.call("Hello").then((e) { print("Main received " + e); }); } and the output: Exception: ouch #0 isolateMain (file:///Users/salomon

问题 I am trying to call an async function from the Isolate function. class IsolateExample { final ReceivePort port = new ReceivePort(); IsolateExample(){ Isolate.spawn(isolateFunction, port.sendPort); } static isolateFunction(SendPort port){ print('inside isolateFunction'); asyncFunction(); } static void asyncFunction() async { print('inside asyncFunction'); } } Usage of above class: final IsolateExample _isolate = new IsolateExample(); Above code looks simple but asyncFunction never gets called.

问题 I am developing an app with Flutter that takes an image and allows the user to save it in the gallery. I am using image_picker_saver plugin to save it. In the beginning I was calling the method to save the image in the main thread but I realized that was really slow and now I am trying to put it in a new isolated thread, but I am getting the same error all the time, so, my question is: How can I call the method to save the image in a new isolated thread? My code looks like this: Main.dart

问题 I am developing an app with Flutter that takes an image and allows the user to save it in the gallery. I am using image_picker_saver plugin to save it. In the beginning I was calling the method to save the image in the main thread but I realized that was really slow and now I am trying to put it in a new isolated thread, but I am getting the same error all the time, so, my question is: How can I call the method to save the image in a new isolated thread? My code looks like this: Main.dart

问题 For me The DART Isolate looks like a Thread (Java/C#) with a different terminology. In which aspect Isolate differs from a Thread? 回答1: Threads use shared memory, isolates don't. For example, the following pseudocode in Java/C# class MyClass { static int count = 0; } // Thread 1: MyClass.count++; print(MyClass.count); // 1; // Thread 2: MyClass.count++; print(MyClass.count); // 2; This also runs the risk of the shared memory being modified simultaneously by both threads. Whereas in Dart,

问题 There is a spawnUri(uri) function in dart:isolate , but I don't find any example. I have guessed its usage, but failed. Suppose there are 2 files, in the first one, it will call spawnUri for the 2nd one, and communicate with it. first.dart import "dart:isolate"; main() { ReceivePort port = new ReceivePort(); port.receive((msg, _) { print(msg); port.close(); }); var c = spawnUri("./second.dart"); c.send(["Freewind", "enjoy dart"], port.toSendPort()); } second.dart String hello(String who,

问题 I am trying to understand how I shall port my Java chess engine to dart. So I have understood that I should use an Isolates to run my engine in parallell with the GUI but how can I force the engine to terminate the search. In java I just set some boolean that where shared between the engine thread and the gui thread. Answer I got: You should send a message to the isolate, telling it to stop. You can simply do something like: port.send('STOP'); My request Thanks for the clarification. What I

问题 In javascript I created a loader for a wizard. I talk about a single page with a wizard section. Every (new) sequence state of the page loads a HTML section from the server into the wizard dom section of the page and executes a script. The script for this sequence state is also loaded. I have seen a lot of discussion about loading Dart scripts and this blog post from Sett Ladd. I understand I can only load Dart scripts in isolates. My questions: Can I create the above like wizard in Dart?

问题 I found this very strange and unfortunate behavior in Dart. When I import 'dart:html' in my main file, my Isolate stops working. With my file "isolate.dart" : main(){ print('BAM'); } This prints "BAM": import 'dart:core'; import 'dart:isolate'; void main() { Isolate.spawnUri(Uri.parse('isolate.dart'), [], null); } but this prints nothing : import 'dart:core'; import 'dart:isolate'; import 'dart:html'; void main() { Isolate.spawnUri(Uri.parse('isolate.dart'), [], null); } How can I get Isolate