Library of nivision - imaqMakeRect: access violation writing location

I am writing a script of image acquisition using the nivision and libraries niimaqdx in python 2.7 using types. When I use the imaqMakeRect function to make a Rect structure to be used in the imaqImagetoArray function, I get a write error access violation.

It's the line that causes the problem - imaqMakeRect (c_int32 (0), c_int32 (0), c_int32 (0x7FFFFFFF), c_int32 (0x7FFFFFFF)).

which results in the error: WindowsError: exception: breach of writing 0 x 00000008 access

The location of access violation seems to depend on the value of the first argument. Any ideas on what could happen? and how to fix it?

Thank you!

Thaks for the suggestions!

This problem himself.

types import *.
IMAQ = windll.nivision

class Rect (Structure):
_fields_ =]
('top', c_int32);
('left', c_int32);
('height', c_int32);
("width", c_int32);
]

imaq.imaqMakeRect.restype = Rect.

IMAQ_NO_RECT = imaq.imaqMakeRect (c_int32 (0), c_int32 (0), c_int32 (100), c_int32 (100))

Tags: NI Hardware

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