[IronPython] Redirecting stdout/stderr, but with context

[Kamil Dworakowski]

This will work for print statements inside the module, but not for
prints coming from arbitrary imported functions. I can't see how to
achive the separation without walking stack on each print.

On Jan 31, 2:45 am, Dino Viehland <di... at microsoft.com> wrote:
> Can you run each document on its own thread?
>
> Oh, it also looks like we actually flow CodeContext through to the caller.  So you could do something like:
>
> class MyFile {
>         public void write(CodeContext context, string data) {
>                 Scope curScope = context.Scope;         // this gives you the module you're running in
>
>                 // handle write here keyed off of the scope object
>         }
>
> }
>
> And replace sys.stdout with that.
>
> -----Original Message-----
> From: users-boun... at lists.ironpython.com [mailto:users-boun... at lists.ironpython.com] On Behalf Of Jeff Slutter
> Sent: Friday, January 30, 2009 6:41 PM
> To: Discussion of IronPython
> Subject: Re: [IronPython] Redirecting stdout/stderr, but with context
>
> Dino Viehland wrote:
> > You can always provide your own stream which is aware of what the currentoutputwindow is.  It could store this in a thread static or just some variable that you update whenever the active window changes.  You can set that via ScriptRuntime.IO.OutputStream.  You could conceptually do the exact same thing from Python just by setting sys.stdout to a file-like object which knows what the currentoutputwindow is.
>
> This is what I'm doing right now and that's where I'm having my problem.
>    I don't think this is a solvable problem since theoutputstream is
> shared by all ScriptScopes, just as theoutputstream for
> System.Console.WriteLine is the same across the process.
>
> In a nutshell, I have this:
>
> class Document
> {
>   void AppendOutput( string text )
>   {
>     m_buffer.Add(text);
>   }
>   List<string> m_buffer;
>
> }
>
> class ConsoleWindow: Form
> {
>    public void WriteOutput( string text, Document doc )
>    {
>       doc.AppendOutput( text );
>       if( doc == m_currentDisplayingDoc )
>       {
>          textBox.Text += text;
>       }
>    }
>
> }
>
> class DocWriter
> {
>   public DocWriter( ConsoleWindow console, Document doc )
>   {
>     m_console = console;
>     m_document = doc;
>   }
>
>   public void write(string text)
>   {
>     m_console.WriteOutput( text, m_document );
>   }
>   ConsoleWindow m_console;
>   Document m_document;
>
> }
>
> void OnDocumentActivate(Document doc)
> {
>   DocWriter writer = new DocWrite(guiConsole, doc);
>   object sysObj = doc.scope.GetVariable("sys");
>   m_engine.Operations.SetMember(sysObj, "stdout", writer);
>   m_engine.Operations.SetMember(sysObj, "stderr", writer);
>
> }
>
> The problem is:
> If there is a script running on DocumentA, that is streamingoutput, and
> then I switch to DocumentB while DocumentA continues to run - theoutput
> for DocumentA starts appearing in the console window for DocumentB as if
> it was for B. This is because sysout is system wide and if I change it
> while DocumentA is writing, then it starts outputting to the new stream
> that was set (and that was registered with DocumentB).
>
> -Jeff
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