wx._core.wxAssertionError: C++ assertion "!GetImageList()" failed at ../src/generic/listctrl.cpp(5443) in OnGetItemImage():... results in SustemError

Newbie Help
1

Sir:

I greatly appreciate if experts direct me to next step.

I am converting an old database coded in python2 to python3, using 2to3 and taking care of numerous runtime messages.

Now, I have no idea how to cope with this, which ran into SystemError: in python3. Message is

"1x:xx:xx: Debug: Adding duplicate image handler for ‘Windows bitmap file’

wx._core.wxAssertionError: C++ assertion “!GetImageList(wxIMAGE_LIST_SMALL)” failed at …/src/generic/listctrl.cpp(5443) in OnGetItemImage(): List control has an image list, OnGetItemImage or OnGetItemColumnImage should be overridden.

The above exception was the direct cause of the following exception:"

So far, I have not been able to figure out where problematic code is. GetImageList() does not exist within user code. “Adding duplicate…” message may be a clue, but so far unable to narrow down.

I hope I am at right place for this question.

regards

kaz2100

System setting follows:
Linux Debian testing.
python3.9.2
wxpython 4.0.7

Original code works with python2.7.18,with wxpython (?) and/or wxwindows(?),

2

It’s telling you that a OnGetItemImage is expected, but you don’t have one. It’s expected because the listctrl has an image list, and it is using the wx.LC_VIRTUAL style. if you don’t need to provide an image for each item or for column then you can implement a OnGetItemImage that just returns -1.

3

Thank you for your reply.

I think I was on wrong track. I was searching “duplicate image handler” which I thought caused following messages. The right track is the other way around, “missing OnGetItemImage results in duplicate image handler.”

Now, I know that user needs to implement OnGetItemImage as wx.ListCtrl page in wxpython.org explains. I found wxwdidget (C++) sample here. Do I need to code it in C++?

regards

kaz2100

4

Sir:

Please ignore my stupid question. I thought I needed to do something with “listctrl.cpp(5443)”

regards

5

See the ListCtrl_virtual.py sample in the demo.

6

Sir:
Thank you for your reply.

Everything is taken care of.

def OnGetItemImage(self, item):
    return -1

The code above is good for me.

The message below looks irrelevant.

xx:xx:xx: Debug: Adding duplicate image handler for ‘Windows bitmap file’

regards