有什么例子dart的`spawnUri（...）`在库“dart：isolate”？ [英] Is there any example for dart's `spawnUri(...)` in library "dart:isolate"?

问题描述

在 dart：isolate 中有一个 spawnUri（uri）函数，但我没有找到任何示例。

假设有两个文件，在第一个文件中，它会调用 spawnUri

b
$ b

  importdart：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
$ b

  String hello（String who，String message）{
 returnHello，$ who，$ message; 
} 
 
 void isolateMain（ReceivePort port）{
 port.receive（（msg，reply）=> reply.send（hello（msg [0]，msg [1] ]））; 
} 
 
 main（）{} 
  

解决方案

strong>警告：此代码已过期。

请使用以下内容替换 second.dart

  importdart：isolate; 
 
 String hello who，String message）{
 returnHello，$ who，$ message; 
} 
 
 main（）{
 port.receive ）=> reply.send（你好（MSG [0]，味精[1]）））; 
} 
  

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, String message) {
   return "Hello, $who, $message";
}

void isolateMain(ReceivePort port) {
  port.receive((msg, reply) => reply.send(hello(msg[0], msg[1]));
}

main() {}

But this example doesn't work. I don't know what's the correct code, how to fix it?

解决方案

WARNING : This code is out of date.

Replace your second.dart with the following to make it work :

import "dart:isolate";

String hello(String who, String message) {
  return "Hello, $who, $message";
}

main() {
  port.receive((msg, reply) => reply.send(hello(msg[0], msg[1])));
}

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