如何启动进程并从 dart 中的 stdin 输入读取参数？

Question

我想在 dart 中实现以下代码并开始 V2ray

cat ~/.config/qv2ray/vcore/config.json | v2ray

这是Node.js工具：

const result = child_process.spawn("v2ray", [], { input: str });

我花了一整天的时间解决这个问题，还是没解决

Answer 1

举例说明如何做到这一点：

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

Future<void> main() async {
  final homeDir = getHomeDir();

  if (homeDir == null) {
    throw Exception('Could not find home directory on running platform!');
  }

  final process = await Process.start('v2ray', const []);
  final resultStdoutFuture = process.stdout
      .transform(const Utf8Decoder())
      .transform(const LineSplitter())
      .toList();

  await process.stdin
      .addStream(File('$homeDir/.config/qv2ray/vcore/config.json').openRead());
  await process.stdin.close();

  print('Process stopped with exit code: ${await process.exitCode}');
  print('Returned stdout:');
  (await resultStdoutFuture).forEach((logLine) => print('\t$logLine'));
}

String? getHomeDir() {
  final envVars = Platform.environment;

  if (Platform.isMacOS) {
    return envVars['HOME'];
  } else if (Platform.isLinux) {
    return envVars['HOME'];
  } else if (Platform.isWindows) {
    return envVars['UserProfile'];
  }
}

Answer 2

import 'dart:io';
import 'dart:convert';
String server = '''
{
   "field":"config"
}
''';
main() async {
  var v2ray = await Process.start('v2ray', []);
  v2ray.stdout.transform(utf8.decoder).forEach(print);
  Stream.value(const Utf8Codec().encode(server)).pipe(v2ray.stdin);
}

如何启动进程并从 dart 中的 stdin 输入读取参数？

How start process and read paramters from stdin input in dart?

stdin

pipe

stream

dart