Skip to content

Foreign library with cdll instead of windll #77

@aquilesC

Description

@aquilesC

I'm building a wrapper for the new Thorlabs Kinesis drivers using from lantz.foreign import LibraryDriver, and found that by default the class Library loads the dll as:

if os.name == 'nt':
    library = ctypes.WinDLL(library)

However, for some reason when I try to call a function, like CC_Open (this is device specific), I get the following error:

Exception: While calling CC_Open with [b'83843619'] (was (b'83843619',)): Procedure probably called with too many arguments (4 bytes in excess)

This is easily solved if i use library = ctypes.CDLL(library).

I imagine that it is not safe to assume the library loader based solely on the operating system, however I don't see a clear way of overriding it; the class Library is able to do so:

class Library(object):
    def __init__(self, library, prefix='', wrapper=None):
        if isinstance(library, str):

just by providing a library that is not a string (i.e. the library already loaded)
But the base class LibraryDriver iterates over names. I don't see a clear solution that wouldn't ruin downstream code.

Metadata

Metadata

Assignees

No one assigned

    Labels

    No labels
    No labels

    Type

    No type

    Projects

    No projects

    Milestone

    No milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions