[issue15857] memoryview: complete support for struct packing/unpacking

[Stefan Krah]

Changes by Stefan Krah :


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status: open -> closed

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[issue15857] memoryview: complete support for struct packing/unpacking

[Stefan Krah]

Stefan Krah added the comment:

Closing, since the main request is tracked in #3132.

--
resolution:  -> duplicate
stage: needs patch -> 

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[issue15857] memoryview: complete support for struct packing/unpacking

[Arfrever Frehtes Taifersar Arahesis]

Changes by Arfrever Frehtes Taifersar Arahesis :


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nosy: +Arfrever

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[issue15857] memoryview: complete support for struct packing/unpacking

[Stefan Krah]

Stefan Krah added the comment:

'>' in struct syntax implies "standard size" for 'l', which is 4 bytes.
ctypes uses machine size for c_long, so on an LP64 machine you can unpack 
the data as:

>>> struct.unpack_from('>qq', a)
(100, 200)

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[issue15857] memoryview: complete support for struct packing/unpacking

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

What about

>>> struct.unpack_from('>ll',a)
(0, 100)

shouldn't that return (100, 200)?

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[issue15857] memoryview: complete support for struct packing/unpacking

[Stefan Krah]

Stefan Krah added the comment:

It's deliberately not implemented (and documented): Since memoryview is a 
complete rewrite, I tried go easy on new features in order to facilitate
review.

My plan was to implement struct packing/unpacking in 3.3.1 in the same
manner as in the new equality function.


The struct error you see is tracked in #3132.

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components: +Interpreter Core
stage:  -> needs patch
title: memoryview of a ctypes struct has incompatible invalid format -> 
memoryview: complete support for struct packing/unpacking
type: behavior -> enhancement
versions:  -Python 3.4

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