AUI Child Frame close with

wxPython Users
1

Hi all,

  I use wxPython 4.0.2a1.dev3717+d4bd2fe, with Python 3.5.3, on a

Linux system.

  (The problem doesn't show up on Windows with wxPython 4.0.1 and

Python 3.6.5)

I noticed the message :

    wx._core.wxAssertionError: C++ assertion "wxDynamicCast(ptr,

T)" failed at
/tmp/pip-build-5abqkim7/wxPython/ext/wxWidgets/include/wx/object.h(160)
in wxCheckCast(): wxStaticCast() used incorrectly

  Please try the attached code : open 3 ChildFrames for example (or

more), then stay “active” on the last child opened, and use " File
/ Close Parent " :

you should get that message in console.

I tried the same with Python 2.7.13 : same message occurs.

It’s not really an error message, but it’s disturbing.

What do you think about it ?

Can it be called a bug ?

Or is it caused by my bad code ?

Thanks.

test.py (2.5 KB)

2

Yes, it looks like it’s a bug in wxWidgets. I’ll poke around later to see if I can find an easy workaround for you or implement a fix.

BTW, it doesn’t avoid this problem, but probably a better way to close all MDI child frames would be a loop like this, since it doesn’t require knowledge of the implementation and hierarchy of the windows:

    child = self.GetActiveChild()

    while child:

        child.Close()

        child = self.GetActiveChild()
···

On Wednesday, May 2, 2018 at 5:25:17 AM UTC-7, Zylyco wrote:

Hi all,

  I use wxPython 4.0.2a1.dev3717+d4bd2fe, with Python 3.5.3, on a

Linux system.

  (The problem doesn't show up on Windows with wxPython 4.0.1 and

Python 3.6.5)

I noticed the message :

    wx._core.wxAssertionError: C++ assertion "wxDynamicCast(ptr,

T)" failed at
/tmp/pip-build-5abqkim7/wxPython/ext/wxWidgets/ include/wx/object.h(160)
in wxCheckCast(): wxStaticCast() used incorrectly

  Please try the attached code : open 3 ChildFrames for example (or

more), then stay “active” on the last child opened, and use " File
/ Close Parent " :

you should get that message in console.

I tried the same with Python 2.7.13 : same message occurs.

It’s not really an error message, but it’s disturbing.

What do you think about it ?

Can it be called a bug ?

–

Robin

3

Thank you Robin.

I changed the code to :

def OnCloseWindow(self, evt):

            child = self.GetActiveChild()
            while child:
                child.Close()
                child = self.GetActiveChild()       
           
            evt.Skip()

But the result is almost the same :

$ python3 test.py
Traceback (most recent call last):
File “test.py”, line 50, in OnCloseWindow
child.Close()
wx._core.wxAssertionError: C++ assertion
“wxDynamicCast(ptr, T)” failed at
/tmp/pip-build-5abqkim7/wxPython/ext/wxWidgets/include/wx/object.h(160)
in wxCheckCast(): wxStaticCast() used incorrectly
$

I hope you’ll find a way to fix that behavior in next release…

Note :

  I obtained that my real project code can works, but that alert

message (still present) caused I had to struggled with it for a
while, ignoring if this alert was belonging to … my python’s
code or a bug ? Now my mind is clear.

···

Le 02/05/2018 à 22:24, Robin Dunn a
écrit :

      Yes, it looks like it's a bug in wxWidgets. I'll poke

around later to see if I can find an easy workaround for you
or implement a fix.

      BTW, it doesn't avoid this problem, but probably a better

way to close all MDI child frames would be a loop like this,
since it doesn’t require knowledge of the implementation and
hierarchy of the windows:

                  child =

self.GetActiveChild()

    while child:

child.Close()

                      child =

self.GetActiveChild()

4

Since I upgraded to wxPython-4.0.2a1.dev3763 :
All is fine now…

Thank you Robin