def _factory(task_handle, virtual_or_physical_name):
"""
Implements the factory pattern for nidaqmx channels.
Args:
task_handle (TaskHandle): Specifies the handle of the task that
this channel is associated with.
virtual_or_physical_name (str): Specifies the flattened virtual
or physical name of a channel.
Returns:
nidaqmx._task_modules.channels.channel.Channel:
Indicates an object that represents the specified channel.
"""
chan_type = ctypes.c_int()
cfunc = lib_importer.windll.DAQmxGetChanType
if cfunc.argtypes is None:
with cfunc.arglock:
if cfunc.argtypes is None:
cfunc.argtypes = [
lib_importer.task_handle, ctypes_byte_str,
ctypes.POINTER(ctypes.c_int)
]
error_code = cfunc(task_handle, virtual_or_physical_name,
ctypes.byref(chan_type))
check_for_error(error_code)
channel_type = ChannelType(chan_type.value)
if channel_type == ChannelType.ANALOG_INPUT:
return nidaqmx._task_modules.channels.AIChannel(
task_handle, virtual_or_physical_name)
elif channel_type == ChannelType.ANALOG_OUTPUT:
return nidaqmx._task_modules.channels.AOChannel(
task_handle, virtual_or_physical_name)
elif channel_type == ChannelType.COUNTER_INPUT:
return nidaqmx._task_modules.channels.CIChannel(
task_handle, virtual_or_physical_name)
elif channel_type == ChannelType.COUNTER_OUTPUT:
return nidaqmx._task_modules.channels.COChannel(
task_handle, virtual_or_physical_name)
elif channel_type == ChannelType.DIGITAL_INPUT:
return nidaqmx._task_modules.channels.DIChannel(
task_handle, virtual_or_physical_name)
elif channel_type == ChannelType.DIGITAL_OUTPUT:
return nidaqmx._task_modules.channels.DOChannel(
task_handle, virtual_or_physical_name)
def chan_type(self):
"""
:class:`nidaqmx.constants.ChannelType`: Indicates the type of
the virtual channel.
"""
val = ctypes.c_int()
cfunc = lib_importer.windll.DAQmxGetChanType
cfunc.argtypes = [
lib_importer.task_handle, ctypes_byte_str,
ctypes.POINTER(ctypes.c_int)
]
error_code = cfunc(self._handle, self._name, ctypes.byref(val))
check_for_error(error_code)
return ChannelType(val.value)