higstar <[email protected]> added the comment:
After reading the documentation for ctypes (specifically "Bit fields are
only possible for integer fields" from section 16.15.1.12) I've updated
the test.
---
import ctypes
import time
class uint(ctypes.BigEndianStructure):
_pack_ = 1 # aligned to 8 bits, not ctypes default of 32
_fields_ = [
("Data0", ctypes.c_uint, 31),
("Data1", ctypes.c_uint, 32),
]
class ulonglong(ctypes.BigEndianStructure):
_pack_ = 1 # aligned to 8 bits, not ctypes default of 32
_fields_ = [
("Data0", ctypes.c_ulonglong, 31),
("Data1", ctypes.c_ulonglong, 32),
]
size_of_structures_in_bytes = 8
def castbytes(type):
buffer = (ctypes.c_byte * size_of_structures_in_bytes)()
for index in range(size_of_structures_in_bytes):
buffer[index] = 0x55
return ctypes.cast(ctypes.pointer(buffer),
ctypes.POINTER(type)).contents
def print_members(test):
print("Data0 is 0x%X, Data1 is 0x%X for %s"%(test.Data0, test.Data1,
test.__class__.__name__))
test_classes = [ uint, ulonglong]
Failed = False
tests = [castbytes(type) for type in test_classes]
for test in tests:
print_members(test)
if not tests[0].Data0 == tests[1].Data0 == 0x2AAAAAAA:
Failed = True
print("Data0 failed")
if not tests[0].Data1 == tests[1].Data1 == 0xAAAAAAAA:
Failed = True
print("Data1 failed")
if not Failed:
print("Passed")
----------
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<http://bugs.python.org/issue6069>
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