New submission from HCT:
I'm trying to create ctypes buffer to be used back and forth with C libraries,
but I keep getting errors. I need to slice the buffer to cut out different
pieces to work on, so I try to get a memoryview of the buffer. does the error
message imply that c_ubyte, c_uint8, c_byte and c_char are not native single
character types?
>>> memoryview(c_ubyte()).cast('B')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: memoryview: source format must be a native single character format
prefixed with an optional '@'
>>> memoryview((c_ubyte*1024)()).cast('B')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: memoryview: source format must be a native single character format
prefixed with an optional '@'
>>> memoryview(c_uint8()).cast('B')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: memoryview: source format must be a native single character format
prefixed with an optional '@'
>>> memoryview((c_uint8*1024)()).cast('B')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: memoryview: source format must be a native single character format
prefixed with an optional '@'
>>> memoryview((c_byte*1024)()).cast('B')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: memoryview: source format must be a native single character format
prefixed with an optional '@'
>>> memoryview((c_char*1024)()).cast('B')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: memoryview: source format must be a native single character format
prefixed with an optional '@'
>>> memoryview((c_char*1024)())[0]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NotImplementedError: memoryview: unsupported format (1024)<c
>>> memoryview((c_byte*1024)())[0]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NotImplementedError: memoryview: unsupported format (1024)<b
>>> memoryview((c_ubyte*1024)())[0]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NotImplementedError: memoryview: unsupported format (1024)<B
>>> memoryview((c_uint8*1024)())[0]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NotImplementedError: memoryview: unsupported format (1024)<B
>>>
----------
components: Library (Lib), ctypes
messages: 204536
nosy: hct
priority: normal
severity: normal
status: open
title: memoryview complain ctypes byte array are not native single character
versions: Python 3.3
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue19803>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
