09.09.13 22:27, random...@fastmail.us написав(ла):
On Mon, Sep 9, 2013, at 15:03, Ian Kelly wrote:
Do you mean that it breaks when overwriting Python string object buffers,
or when overwriting arbitrary C strings either received from C code or
created with create_unicode_buffer?
If the former, I think that is to be expected since ctypes ultimately
can't
know what is the actual type of the pointer it was handed -- much as in
C,
that's up to the programmer to get right. I also think it's very bad
practice to be overwriting those anyway, since Python strings are
supposed
to be immutable.
If the latter, that sounds like a bug in ctypes to me.
I was talking about writing to the buffer object from python, i.e. with
slice assignment.
s = 'Test \U00010000'
len(s)
6
buf = create_unicode_buffer(32)
buf[:6] = s
TypeError: one character unicode string expected
buf[:7] = s
ValueError: Can only assign sequence of same size
buf[:7] = 'Test \ud800\udc00'
buf[:7]
'Test \U00010000' # len = 6
Assigning with .value works, however, which may be a viable workaround
for most situations. The "one character unicode string expected" message
is a bit cryptic.
Please report a bug on http://bugs.python.org/.
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