def all(self):
"""
:class:`nidaqmx._task_modules.channels.channel.Channel`:
Specifies a channel object that represents the entire list of
virtual channels on this channel collection.
"""
# Passing a blank string means all channels.
return Channel._factory(self._handle, '')
def channels(self):
"""
:class:`nidaqmx._task_modules.channels.channel.Channel`: Specifies
a channel object that represents the entire list of virtual
channels in this task.
"""
return Channel._factory(
self._handle, flatten_channel_string(self.channel_names))
def __getitem__(self, index):
"""
Indexes a subset of virtual channels on this channel collection.
Args:
index: The value of the index. The following index types are
supported:
- str: Name of the virtual channel. You also can specify a
string that contains a list or range of names to this
input. If you have a list of names, use the DAQmx
Flatten Channel String function to convert the list to a
string.
- int: Index/position of the virtual channel in the collection.
- slice: Range of the indexes/positions of virtual channels in
the collection.
Returns:
nidaqmx._task_modules.channels.channel.Channel:
Indicates a channel object representing the subset of virtual
channels indexed.
"""
if isinstance(index, six.integer_types):
channel_names = self.channel_names[index]
elif isinstance(index, slice):
channel_names = flatten_channel_string(self.channel_names[index])
elif isinstance(index, six.string_types):
channel_names = index
else:
raise DaqError(
'Invalid index type "{0}" used to access channels.'.format(
type(index)), DAQmxErrors.UNKNOWN)
if channel_names:
return Channel._factory(self._handle, channel_names)
else:
raise DaqError(
'You cannot specify an empty index when indexing channels.\n'
'Index used: {0}'.format(index), DAQmxErrors.UNKNOWN)
def __reversed__(self):
channel_names = self.channel_names
channel_names.reverse()
for channel_name in channel_names:
yield Channel._factory(self._handle, channel_name)
def __iter__(self):
for channel_name in self.channel_names:
yield Channel._factory(self._handle, channel_name)