On Wed, Aug 10, 2016 at 10:26 PM, Lawrence D’Oliveiro
<[email protected]> wrote:
> But it has to copy the bytes into an array.array object, then decode that. Is
> there a way it
> could access the bytes memory directly?
ctypes cast, string_at, wstring_at, memmove, and memset are
implemented as FFI calls. Since ctypes FFI calls convert bytes
arguments to the base address of the buffer, you can cast() bytes to
c_void_p to get the address. For example:
>>> data = b'abc'
>>> addr = ctypes.cast(data, ctypes.c_void_p).value
>>> ctypes.string_at(addr, 3)
'abc'
For bytearray, use the buffer interface to create a ctypes array. The
array is not a copy. For example:
>>> data = bytearray(b'abc')
>>> a = (ctypes.c_char * len(data)).from_buffer(data)
>>> addr = ctypes.addressof(a)
>>> ctypes.string_at(addr, 3)
'abc'
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