Open songyuc opened 1 week ago
Improving an error message is a feature, not a bug, but there shouldn't be any reason why it can't be done here (it just won't be backported to maintenance releases).
(The bugfix in pynput
(or the user's own code) is to use ctypes.WinDLL("user32")
rather than ctypes.windll.user32
so that they aren't modifying shared objects. This should already be documented, I'm pretty sure.)
Improving an error message is a feature, not a bug, but there shouldn't be any reason why it can't be done here (it just won't be backported to maintenance releases).
(The bugfix in
pynput
(or the user's own code) is to usectypes.WinDLL("user32")
rather thanctypes.windll.user32
so that they aren't modifying shared objects. This should already be documented, I'm pretty sure.)
Thanks sincerely for your guide!
Description:
When working with Windows API functions (such as SetWindowsHookExW) using ctypes, providing a HOOKPROC callback function of an incorrect type results in an unclear error message. This can be confusing, especially for beginners or when debugging complex scenarios.
Current error message: TypeError: expected WinFunctionType instance instead of WinFunctionType
Suggested improved error message: TypeError: expected WinFunctionType with signature (restype=wintypes.LPARAM, argtypes=[ctypes.c_int32, wintypes.WPARAM, wintypes.LPARAM]) but received WinFunctionType with signature (restype=ctypes.c_int, argtypes=[ctypes.c_int, wintypes.WPARAM, wintypes.LPARAM])
Steps to Reproduce:
Expected Result: A clear error message indicating the mismatch between the expected and provided WinFunctionType, including details about their signatures.
Actual Result: An unclear error message: "TypeError: expected WinFunctionType instance instead of WinFunctionType"
Python Version: 3.12.7 Operating System: Windows
Suggested Improvement: Modify the logic in ctypes that generates these error messages to include more detailed information about the expected and actual WinFunctionType instances, such as their return types and argument types. This would greatly improve the readability and usefulness of the error message, especially for beginners and when debugging complex scenarios.
Additional Notes: This issue becomes apparent when using libraries like
pynput
that modify Windows API function signatures. A more descriptive error message would help users identify and resolve such conflicts more easily.CPython versions tested on:
3.12
Operating systems tested on:
Windows