Re: [Ironpython-users] ShowDialog Hangs

Andrew Graham Wed, 25 Feb 2015 12:56:08 -0800

Not really strange, expected behaviour in fact. The Form is drawn OK butthere is no message loop running on the thread to pump messages to it so itwill be unresponsive and sit there until the thread exits. A modal dialog,or Form shown modally, tries to pump the message queue itself, that is howit acheives modality, and as my previous email to you stated, as there is nomessage loop on your thread for it to pump so that is probably why it hangs.


Regards


Andy graham

-----Original Message-----From: Andrew Ayre

Sent: Wednesday, February 25, 2015 4:41 PM
To: ironpython-users@python.org
Subject: Re: [Ironpython-users] ShowDialog Hangs

Thanks for the responses. Strangely the following script works:

import clr
import time
clr.AddReference("System.Windows.Forms")
from System.Windows.Forms import OpenFileDialog, DialogResult, Form
F = Form()
F.Show()
time.sleep(5)

This displays a form and then closes it when the script ends after five
seconds.

However simply swapping F.Show for OpenFileDialog().ShowDialog() causes
the script to hang.

I will check the suggestions made, but I wondered if this behavior with
the form gives anyone some additional clues.

Thanks, Andy

On 2/25/2015 2:50 PM, Slide wrote:

You need to make sure the thread was started as an STAThread I believe,
otherwise the common windows controls (OpenFileDialog being one of them)
won't work correctly.

On Wed Feb 25 2015 at 2:02:32 AM Andrew Ayre <a...@britishideas.com
<mailto:a...@britishideas.com>> wrote:

    I am sure I am making a silly mistake somewhere.

    I have IronPython embedded in my C# WinForms application.

    The interpreter is running in a thread that has been created for it.
    I.e. not the UI thread.

    Everything works fine until the call to Dialog.ShowDialog, at which
    point execution of IronPython hangs and no dialog appears.

I'm guessing that this is because the interpreter is not running intheUI thread (which I don't want to do because sometimes scripts can takea

    long time to execute, depending on what they are doing).

    This is my first attempt using WinForms from scripting in my
    application.

    Any hints or suggestions on how I can debug this, synchronize with the
    UI thread or something else?

    Thanks! Andy

    import clr
    clr.AddReference("System.__Windows.Forms")
    from System.Windows.Forms import OpenFileDialog, DialogResult

    Dialog = OpenFileDialog()
    Dialog.ShowDialog()

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    Andy
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Re: [Ironpython-users] ShowDialog Hangs

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