[IronPython] Screen inhibited when running a .py program that uses ShowDialog

[Martin Maly]

Hi,

I am assuming that the winforms your code imports at the top is the winforms.py that we include with our tutorial. If that is indeed the case, it may very well be the cause of the hang you are seeing.

The winforms.py does a bit more than just import the System.Windows.Forms assemblies. It also creates another thread that the code interactively typed at the console will run on. The reason is that the console thread is suspended, waiting for input and cannot process messages for the window application which is being interactively built. Therefore the winforms.py launches new thread that the interactive code will execute on.

Once you run your code as a script, you are likely to hit problems. One reason for the hang I can see from the top of my head is that the thread created by winforms.py depends on the console exiting to exit its message loop so it may cause your app to stay up and running/limping :).

The solution is to not import winforms.py and only use the following code at the top of your script (taken from winforms.py)

import clr
clr.AddReferenceByPartialName("System.Windows.Forms")
clr.AddReferenceByPartialName("System.Drawing")

Martin


-----Original Message-----
From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Paparipote .
Sent: Monday, February 20, 2006 3:20 PM
To: users at lists.ironpython.com
Subject: [IronPython] Screen inhibited when running a .py program that uses ShowDialog

To demonstrate this please:
1) invoke ironpythonconsole from DOS prompt
2) Copy and paste the next code (it is inoffensive):

import winforms
from System.Windows.Forms import *
from System.Drawing import *

def ShowFiles(multiSel=1, title="Select a File to select"):
	fd = OpenFileDialog()
	fd.Multiselect = multiSel
	fd.Title = title
	if fd.ShowDialog() == DialogResult.OK:
		return (0, fd.FileNames)
	else:
		msg = 'Selection of file(s) was cancelled.'
		MessageBox.Show(msg)
		return (1, msg)

if __name__ == '__main__':
	res = ShowFiles(title="Select files to show")
	if res[0] == 0:
		for i in res[1]:
			print i
		MessageBox.Show("Successful show")

3) In the File dialog window Select one or more files and press OK or 
cancel.
4) All finishes well, ¿ok?

Now, save the code in a file (for example cat.py)
1) From a Dos command prompt type:   ironpythonconsole cat.py and press 
return.
2) Do the same actions as above.
3) After finishing the script with a windows message box, does not it keep 
hanged?' Please, confirm me that? Thanks.

Best regards.

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