从另一个Dart程序运行交互式Dart程序 [英] Running an interactive Dart program from another Dart program

问题描述

我有一个相当冗长的命令行程序，需要用户输入参数，然后使用这些参数进行处理。我想做的是将程序分为交互式和非交互式。我试图这样做，并打算让非交互式程序调用交互式程序并使用结果（参数），基于这些参数的过程。程序的非交互部分在处理时在控制台上显示结果。我看过Process.run和Process.start，但显然他们不以这种方式工作。还有另一个类似的问题，大约12个月大，所以我认为它值得再次询问。

I have a fairly lengthy command-line program that requires user input of parameters and then processes using those parameters. What I would like to do is split the program into interactive and non-interactive. I attempted to do that, and intended to have the non-interactive program "call" the interactive program and using the results (parameters), process based on those parameters. The non-interactive part of the program displays results on the console as it processes. I have looked at Process.run and Process.start, but apparently they don't function that way. There is another similar question to this that is about 12-months old, so I thought it worthwhile asking again.

推荐答案

我看过Process.run和Process.start，但显然他们不以这种方式工作。

I have looked at Process.run and Process.start, but apparently they don't function that way.

Process.start 它可以做你想要的，但你必须成为一个更舒适的异步编程，如果你还没有。

Process.start is what you want here. It can do what you want, but you'll have to become a bit more comfortable with async programming if you aren't already. You'll spawn the process and then asynchronously read and write to the spawned processes stdout and stdin streams.

您的交互式程序可以执行这样的操作：

Your interactive program can do something like this:

// interactive.dart
import 'dart:io';

main() {
  var input = stdin.readLineSync();
  print(input.toUpperCase());
}

使用 stdin 从命令行读取输入。然后，它使用常规 print（）输出处理结果。

It's using stdin to read input from the command line. Then it outputs the processed result using regular print().

非交互式脚本可以生成并驱动使用类似：

The non-interactive script can spawn and drive that using something like:

import 'dart:convert';
import 'dart:io';

main() {
  Process.start("dart", ["interactive.dart"]).then((process) {
    process.stdin.writeln("this is the input");

    UTF8.decoder.fuse(new LineSplitter()).bind(process.stdout).listen((line) {
      print(line);
    });
  });
}

它使用 Process.start 生成交互式脚本。它使用 process.stdin 写入它。要读取生成的输出，它必须跳过一些箍将原始字节输出转换为每行的字符串，但这是基本的想法。

It uses Process.start to spawn the interactive script. It writes to it using process.stdin. To read the resulting output it has to jump through some hoops to convert the raw byte output to strings for each line, but this is the basic idea.

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