Need Help: How do I send commands to a Process that takes commands from stdin?

[XulChris]

Hi, I'm trying to write a dart application that can talk to a standalone process on my server, I need to be able to both read and write to that process.

The dartlang web site shows a nice example of how to get output from a process here:

http://www.dartlang.org/articles/io/#processes

However, this example does not show how to write data to the process' stdin.

Here is my broken, non-working code:

void main() {

  var p = Process.start('/usr/local/bin/stockfish', []);

  var stdoutStream = new StringInputStream(p.stdout);

  stdoutStream.onLine = () => print(stdoutStream.readLine());

  p.stdin.writeString("exit\n", Encoding.ASCII); // SocketIOException: writeList failed - invalid socket handle

  p.onExit = (exitCode) {

    print('exit code: $exitCode');

    p.close();

  };

}

Please help. Am I doing this wrong? How do I send a command to a process that takes commands from stdin?

[Kevin Kellogg]

It looks like you're writing to p.stdin before it's ready. Try:

p.onStart = ()  {

 // p.stdin is ready now.

};

Kevin

[XulChris]

Yep, that was it! Thanks. :)