/usr/lib/python3/dist-packages/pyvisa/ctwrapper/types.py is in python3-pyvisa 1.8-2.
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"""
pyvisa.ctwrapper.types
~~~~~~~~~~~~~~~~~~~~~~
VISA VPP-4.3 data types (VPP-4.3.2 spec, section 3) using ctypes constants.
This file is part of PyVISA.
All data types that are defined by VPP-4.3.2.
The module exports all data types including the pointer and array types. This
means "ViUInt32" and such.
:copyright: 2014 by PyVISA Authors, see AUTHORS for more details.
:license: MIT, see LICENSE for more details.
"""
from __future__ import division, unicode_literals, print_function, absolute_import
import ctypes as _ctypes
from .cthelper import PYTHON3, FUNCTYPE
# Part One: Type Assignments for VISA and Instrument Drivers, see spec table
# 3.1.1.
#
# Remark: The pointer and probably also the array variants are of no
# significance in Python because there is no native call-by-reference.
# However, as long as I'm not fully sure about this, they won't hurt.
def _type_pair(ctypes_type):
return ctypes_type, _ctypes.POINTER(ctypes_type)
def _type_triplet(ctypes_type):
return _type_pair(ctypes_type) + (_ctypes.POINTER(ctypes_type),)
ViUInt64, ViPUInt64, ViAUInt64 = _type_triplet(_ctypes.c_uint64)
ViInt64, ViPInt64, ViAInt64 = _type_triplet(_ctypes.c_int64)
ViUInt32, ViPUInt32, ViAUInt32 = _type_triplet(_ctypes.c_uint32)
ViInt32, ViPInt32, ViAInt32 = _type_triplet(_ctypes.c_int32)
ViUInt16, ViPUInt16, ViAUInt16 = _type_triplet(_ctypes.c_ushort)
ViInt16, ViPInt16, ViAInt16 = _type_triplet(_ctypes.c_short)
ViUInt8, ViPUInt8, ViAUInt8 = _type_triplet(_ctypes.c_ubyte)
ViInt8, ViPInt8, ViAInt8 = _type_triplet(_ctypes.c_byte)
ViAddr, ViPAddr, ViAAddr = _type_triplet(_ctypes.c_void_p)
ViChar, ViPChar, ViAChar = _type_triplet(_ctypes.c_char)
ViByte, ViPByte, ViAByte = _type_triplet(_ctypes.c_ubyte)
ViBoolean, ViPBoolean, ViABoolean = _type_triplet(ViUInt16)
ViReal32, ViPReal32, ViAReal32 = _type_triplet(_ctypes.c_float)
ViReal64, ViPReal64, ViAReal64 = _type_triplet(_ctypes.c_double)
if PYTHON3:
class ViString(object):
@classmethod
def from_param(cls, obj):
if isinstance(obj, str):
return bytes(obj, 'ascii')
return obj
class ViAString(object):
@classmethod
def from_param(cls, obj):
return _ctypes.POINTER(obj)
ViPString = ViString
else:
class ViString(object):
@classmethod
def from_param(cls, obj):
if isinstance(obj, str):
return obj
elif isinstance(obj, unicode):
return obj.encode('ascii')
return obj
class ViAString(object):
@classmethod
def from_param(cls, obj):
return _ctypes.POINTER(obj)
ViPString = ViString
# This follows visa.h definition, but involves a lot of manual conversion.
# ViBuf, ViPBuf, ViABuf = ViPByte, ViPByte, _ctypes.POINTER(ViPByte)
ViBuf, ViPBuf, ViABuf = ViPString, ViPString, ViAString
def buffer_to_text(buf):
return buf.value.decode('ascii')
ViRsrc = ViString
ViPRsrc = ViString
ViARsrc = ViAString
ViKeyId, ViPKeyId = ViString, ViPString
ViStatus, ViPStatus, ViAStatus = _type_triplet(ViInt32)
ViVersion, ViPVersion, ViAVersion = _type_triplet(ViUInt32)
_ViObject, ViPObject, ViAObject = _type_triplet(ViUInt32)
_ViSession, ViPSession, ViASession = _type_triplet(ViUInt32)
class ViObject(_ViObject):
@classmethod
def from_param(cls, obj):
if obj is None:
raise ValueError('Session cannot be None. The resource might be closed.')
return _ViObject.from_param(obj)
ViSession = ViObject
ViAttr = ViUInt32
ViConstString = _ctypes.POINTER(ViChar)
# Part Two: Type Assignments for VISA only, see spec table 3.1.2. The
# difference to the above is of no significance in Python, so I use it here
# only for easier synchronisation with the spec.
ViAccessMode, ViPAccessMode = _type_pair(ViUInt32)
ViBusAddress, ViPBusAddress = _type_pair(ViUInt32)
ViBusAddress64, ViPBusAddress64 = _type_pair(ViUInt64)
ViBusSize = ViUInt32
ViAttrState, ViPAttrState = _type_pair(ViUInt32)
# The following is weird, taken from news:zn2ek2w2.fsf@python.net
ViVAList = _ctypes.POINTER(_ctypes.c_char)
ViEventType, ViPEventType, ViAEventType = _type_triplet(ViUInt32)
ViPAttr = _ctypes.POINTER(ViAttr)
ViAAttr = ViPAttr
ViEventFilter = ViUInt32
ViFindList, ViPFindList = _type_pair(ViObject)
ViEvent, ViPEvent = _type_pair(ViObject)
ViJobId, ViPJobId = _type_pair(ViUInt32)
# Class of callback functions for event handling, first type is result type
ViHndlr = FUNCTYPE(ViStatus, ViSession, ViEventType, ViEvent, ViAddr)
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