In an ideal world, we could achieve this through the PEP3118 buffer protocol, something like:
def dtype_from_ctypes_type(t):
# needed to ensure that the shape of `t` is within memoryview.format
class DummyStruct(ctypes.Structure):
_fields_ = [('a', t)]
# empty to avoid memory allocation
ctype_0 = (DummyStruct * 0)()
mv = memoryview(ctype_0)
# convert the struct, and slice back out the field
return _dtype_from_pep3118(mv.format)['a']
Unfortunately, this fails because:
ctypes cannot handle length-0 arrays with PEP3118 (bpo-32782)
PEP3118 cannot represent unions, but both numpy and ctypes can
ctypes cannot handle big-endian structs with PEP3118 (bpo-32780)
Conversion from ctypes to dtype.
Conversion from ctypes to dtype.
In an ideal world, we could achieve this through the PEP3118 buffer protocol, something like:
def dtype_from_ctypes_type(t):
# needed to ensure that the shape of `t` is within memoryview.format
class DummyStruct(ctypes.Structure):
_fields_ = [('a', t)]
# empty to avoid memory allocation
ctype_0 = (DummyStruct * 0)()
mv = memoryview(ctype_0)
# convert the struct, and slice back out the field
return _dtype_from_pep3118(mv.format)['a']
Unfortunately, this fails because:
ctypes cannot handle length-0 arrays with PEP3118 (bpo-32782)
PEP3118 cannot represent unions, but both numpy and ctypes can
ctypes cannot handle big-endian structs with PEP3118 (bpo-32780)
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