Replacing StandardInput for ScriptEngine?

Ruby IronRuby
1

Hello,

I am experimenting with script IO in preparation for hosting an IRB
session via an embedded SSH server and/or embedded HTTP server, but I’m
having trouble getting the script environment to use a custom stream for
standard input. I used the following code for setting up my IronRuby
environment:

public Form1()

    {

        InitializeComponent();







        _stdIn = new MemoryStream();

        _inputWriter = new StreamWriter(_stdIn);

        txtStandardIn.KeyPress+=(s,e)=>

                                    {

_inputWriter.Write(e.KeyChar);

                                        _inputWriter.Flush();

                                        Debug.Write(e.KeyChar);

                                    };





        _stdOut = new FifoStream();

        _outputReader = new StreamReader(_stdOut);

        _stdOut.DataArrived += StdOutDataArrived;



        _scriptEngine = Ruby.CreateEngine();

        _globalScope = _scriptEngine.CreateScope();





        _scriptEngine.Runtime.IO.SetInput(_stdIn, Encoding.Default);

        _scriptEngine.Runtime.IO.SetOutput(_stdOut,

Encoding.Default);

    }

If I write “hello” + Environment.NewLine to the input stream and flush
the writer and then use the ScriptEngine e to execute a “x = gets” - x
is always nil. However, if I use the script engine to execute “puts
‘hello’” my custom output stream is used and I see my output.

I feel like I am missing a key ingredient in my setup process - any help
would be appreciated.

Thanks,

Nathan

2

Please disregard. The StandardInput is being set properly and IronRuby
is using it. Writing to a MemoryStream (obviously) positions the stream
at EOF - the next read will obviously come up empty unless the position
is reset. Used a queue-based stream and all worked well.

From: [email protected]
[mailto:[email protected]] On Behalf Of Nathan Stults
Sent: Thursday, November 05, 2009 12:30 PM
To: [email protected]
Subject: [Ironruby-core] Replacing StandardInput for ScriptEngine?

Hello,

I am experimenting with script IO in preparation for hosting an IRB
session via an embedded SSH server and/or embedded HTTP server, but I’m
having trouble getting the script environment to use a custom stream for
standard input. I used the following code for setting up my IronRuby
environment:

public Form1()

    {

        InitializeComponent();







        _stdIn = new MemoryStream();

        _inputWriter = new StreamWriter(_stdIn);

        txtStandardIn.KeyPress+=(s,e)=>

                                    {

_inputWriter.Write(e.KeyChar);

                                        _inputWriter.Flush();

                                        Debug.Write(e.KeyChar);

                                    };





        _stdOut = new FifoStream();

        _outputReader = new StreamReader(_stdOut);

        _stdOut.DataArrived += StdOutDataArrived;



        _scriptEngine = Ruby.CreateEngine();

        _globalScope = _scriptEngine.CreateScope();





        _scriptEngine.Runtime.IO.SetInput(_stdIn, Encoding.Default);

        _scriptEngine.Runtime.IO.SetOutput(_stdOut,

Encoding.Default);

    }

If I write “hello” + Environment.NewLine to the input stream and flush
the writer and then use the ScriptEngine e to execute a “x = gets” - x
is always nil. However, if I use the script engine to execute “puts
‘hello’” my custom output stream is used and I see my output.

I feel like I am missing a key ingredient in my setup process - any help
would be appreciated.

Thanks,

Nathan