Gimp python plugin failing to register

[violgamba]

I’ve been trying to write a python plugin for Gimp for a custom image file format I’m experimenting with. I can’t get the plugin to register. The plugin file’s name does show up briefly in the loading splash-screen, but the exporter doesn’t recognize the extension and the plugin doesn’t show in Gimp’s plug-in browser.

I’m using Gimp 2.1.30 on Windows 10.

Here is my current, non-working plugin. It’s pared down to minimize confounding factors for this problem:

def save_prt(img, drawable, filename, raw_filename):
  pdb.gimp_message("Exporting " + filename)

register(
	"file-prt-save",
	"Save a p-art (.prt) file",
	"Save an image to the p-art (.prt) file format.  This format is useful for storing pixel art with small file sizes.",
	"Jonathan Heard",
	"Jonathan Heard",
	"2023",
	"P-art image",
	"*",
	[
		(PF_IMAGE, "image", "Input image", None),
		(PF_DRAWABLE, "drawable", "Input drawable", None),
		(PF_STRING, "filename", "The name of the file", None),
		(PF_STRING, "raw-filename", "The name of the file", None),
	],
	[],
	save_prt,
    on_query = register_save_handlers,
    menu = '<Save>'
)

main()

Does anyone have an idea as to what might be going wrong?
Thanks!

[Ofnuts]

Several things:

• You are missing a python “shebang” (at least if you expect to run on Unix/OSX:

#!/usr/bin/env python2

• You are missing the gimpfu import:

from gimpfu import *

• You don’t provide a body for register_save_handlers, you normally need something like:

def register_save_handlers():
    gimp.register_save_handler('file-prt-save', 'prt', '')

It is much easier to debug these scripts on Linux/OSX but here are some tips to ease your life on Windows: Debugging python-fu scripts in Windows

PS: " It’s pared down to minimize confounding factors for this problem": the danger of doing so is that you could remove the problem part. When you call for help, it is often because you are not looking at the right spot.

[violgamba]

Thank you for replying with this information! I’ve obviously missed some basic stuff. I got to where I was by working out a basic export function in the console. I then studyied “file-openraster.py” for how to register the function for file export. When I said that I’d pared down my code, I just meant that I swapped my export function with a console message, after which I did confirm that the problem remained.

I’ll continue to study “file-openraster.py” as I must be still missing something. It’s just that there is a lot of code that is not useful for what I’m trying to do, making it tricky to sport important things like “register_save_handlers”.

Thanks for the link, the final suggestion of “Routing python outputs to file” seems like it might help.