Notepad++, windows 11 and pythonscript

ThosRTanner

I’ve recently had to replace my windows 10 computer with a windows 11 one. After reinstalling notepad++, pythonscript and python2.7 and the windows api python extension, I’m having problems with this script:

https://github.com/ThosRTanner/python-notepad-scripts/blob/master/statusbar_for_linter.py

The read_statusbar_section function is always returning an empty string as the SendMessage function always returns 0.

I’m at a loss to work out what is happening here, and if anyone has any suggestions I’d be grateful.

(PS I may have posted this twice. the forum is being a bit strange today)

Mark Olson

@ThosRTanner
Have you posted an issue in the repo?

ThosRTanner

@Mark-Olson Which repo?

Ekopalypse

@ThosRTanner

The problem with the code is that it is not clear how SendMessage needs to be called.
Make sure you define a prototype, such as

import ctypes
from ctypes.wintypes import (
	HWND, UINT, WPARAM, LPARAM
)
LRESULT = ctypes.c_ssize_t
SendMessage = user32.SendMessageW
SendMessage.restype = LRESULT
SendMessage.argtypes = [HWND, UINT, WPARAM, LPARAM]

and then use that always.
Python now knows how to handle the parameters and will throw exceptions if they are not specified properly.
HWND is a pointer, while the rest are integer types.

Alan Kilborn

@Ekopalypse said in Notepad++, windows 11 and pythonscript:

LRESULT = ctypes.c_ssize_t

This is interesting. Previously I believe you recommended:

LRESULT = LPARAM

and indeed that is what I have in my scripts that use this.
Is ctypes.c_ssize_t a better thing to use?

Ekopalypse

@Alan-Kilborn said in Notepad++, windows 11 and pythonscript:

Is ctypes.c_ssize_t a better thing to use?

No, they are exactly the same.

I have finally started to migrate my scripts with a single winapi module
and I kept the c_ssize_t variant because it is more descriptive for me.
There is no doubt that it is a signed size_t, while LPARAM cannot tell.
If wintypes had contained LRESULT, I would have taken it.

ThosRTanner

it’s now objecting because what create_string_buffer returns isn’t an integer.

Ekopalypse

@ThosRTanner

use ctypes.addressof to get the int representation of the pointer

ThosRTanner

@Ekopalypse working great now. thank you!