[alsa-devel] [PATCH 13/13] libhinawa: add sample scripts

[Alexander E. Patrakov]

27.01.2015 20:09, Takashi Sakamoto wrote:
> Hi Alexander,
>
> On Jan 25 2014 21:14, Alexander E. Patrakov wrote:
>> 25.01.2015 16:34, Takashi Sakamoto wrote:
>>> +from array import array
>>> +
>>> +# helper function
>>> +def get_array():
>>> +    # The width with 'L' parameter is depending on environment.
>>> +    arr = array('L')
>>> +    if arr.itemsize is not 4:
>>> +        arr = array('I')
>>> +    return arr
>>
>>
>> If you insist on using arrays, then please add an assertion that you
>> have actually got an array with itemsize 4 at the end.
>
> Thanks for your comment. Certainly, I should put assersion to the
> function for guarantee to return 32bit array.
>
>> But, if I were you, I'd go with the "ctypes" module instead, if it
>> works. Here is how you get a fixed-size (in the example, 10 elements)
>> array with signed 4-byte elements:
>>
>> from ctypes import *
>> TenInts = c_int32 * 10
>> ii = TenInts()
>>
>> The result supports buffer protocol.
>
> I didn't realize this way, thank you.
>
> But I'm too lazy to like fixed size of array. With the array module, I
> can expand the length of array automatically, like:
>
> {{{
> from array import array
> arr = array('L')
> arr.append(1)
> arr.append(2)
> ...
> arr.append("Aaargh, how large number!")
> }}}
>
> Do you know the ways for flexible length in ctype array?

Unfortunately, there is no such thing in ctypes.

-- 
Alexander E. Patrakov