Simple python fix for script

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1

Hi,
This is a very tiny project, basically just fixing an error of a simple script.

  • Type of project: fix an error of a very simple script. (not even an addon).
  • Who am I: New Media Supply. I do (exciting) freelance work next to my (very boring) 32-hour partime job and breaking my head on how to get thumbnails in my addon (explaining later).
  • Deadline: I want to have this done before Wednesday, April 24.
  • Budget 15 pounds, or one of my products?
  • I don’t need anything extra, just that the addon is working as shown in the video in Blender 2.80

Complete description of task :

Traceback (most recent call last):
  File "\ReferenceTemplateManager_05.py", line 29, in get_previews_collection
  File "C:\Users\Flatron\Downloads\blender-280-April_15\blender-2.80.0-git.860a9f979d60-windows64\2.80\scripts\modules\bpy\utils\previews.py", line 97, in load
    raise KeyError("key {name!r} already exists")
KeyError: 'key {name!r} already exists'
File "\ReferenceTemplateManager_05.py", line 17, in get_previews_collection

Some background info:
At the end it’s for the EV-Express and took me a more than a week finding out how to get thumbnails / previews instead of buttons. I analysed other scripts that uses previews, asked on blender exchange and here on Blender artists but this specific part takes me to long to solve and I want to move on with other exciting features I have in mind. If I have this specific example as in the video working in Blender 2.80 I can implement that in the EV Express. I exactly need what’s in the video. (For example the ui_previews_dynamic_enum.py template is not useful since you have to select a directory in the UI, and a selection doesn’t do anything.).

2

As long as you’re not reloading, try with :

if file not in custom_icons:
    	custom_icons.load(file, fullpath, 'IMAGE')
1 Like
3

Thanks!, I will check today after work how that works out.

4

Could you show a tiny bit more of the code? Tried several combinations, but seems not to work. And with “not reloading” you mean running the script again?

5

In your sample file, error occurs on line 29 : you try to reload the same image again, without checking if the pic already is loaded.

for file in os.listdir(directory):
    if file.endswith(".png"):
        fullpath = os.path.join(directory, file)   
        # check if file allready loaded if so skip loading
        if file not in custom_icons:         
            custom_icons.load(file, fullpath, 'IMAGE')
        images.append(( fullpath, file, fullpath, custom_icons[file].icon_id, i))
        i+=1

Also line 30 custom_icons(file).icon_id must be custom_icons[file] !

If you are not reloading your thumbs in middle of a session, then you’re fine with this code.
If you reload, you should cleanup custom_icons before reloading like you do in unregister line 73

6

Oh, that is great! Finally I get now previews. That was what I was asking for. It was crashing when clicking on one of the thumbnails but I don’t need that function def open_image(self, context): anyway. So I believe I should be able to manage the rest.
I will send you a private message regarding promised compensation.