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We need to deal with a range ('0-3' or '0:3'), a list ('0,1,2,3') and a single item
'''
# First we deal with a list
rep_cap_list = repeated_capability.split(',')
if len(rep_cap_list) > 1:
# We have a list so call ourselves again to let the iterable instance handle it
return _convert_repeated_capabilities(rep_cap_list, prefix)
# Now we deal with ranges
# We remove any prefix and change ':' to '-'
r = repeated_capability.strip().replace(prefix, '').replace(':', '-')
rc = r.split('-')
if len(rc) > 1:
if len(rc) > 2:
raise errors.InvalidRepeatedCapabilityError("Multiple '-' or ':'", repeated_capability)
start = int(rc[0])
end = int(rc[1])
if end < start:
rng = range(start, end - 1, -1)
else:
rng = range(start, end + 1)
return _convert_repeated_capabilities(rng, prefix)
# If we made it here, it must be a simple item so we remove any prefix and return
return [repeated_capability.replace(prefix, '').strip()]
Returns:
attribute_value (int): Returns the current value of the attribute. Pass the address of a
ViInt32 variable. From the function panel window, you can use this
control as follows. - If the attribute currently showing in the
Attribute ID ring control has constants as valid values, you can view a
list of the constants by pressing on this control. Select a value by
double-clicking on it or by selecting it and then pressing .
'''
vi_ctype = visatype.ViSession(self._vi) # case S110
channel_name_ctype = ctypes.create_string_buffer(self._repeated_capability.encode(self._encoding)) # case C010
attribute_id_ctype = visatype.ViAttr(attribute_id) # case S150
attribute_value_ctype = visatype.ViInt32() # case S200
error_code = self._library.niSwitch_GetAttributeViInt32(vi_ctype, channel_name_ctype, attribute_id_ctype, None if attribute_value_ctype is None else (ctypes.pointer(attribute_value_ctype)))
errors.handle_error(self, error_code, ignore_warnings=False, is_error_handling=False)
return int(attribute_value_ctype.value)
Returns the library.Library singleton for niswitch.
'''
global _instance
global _instance_lock
with _instance_lock:
if _instance is None:
try:
library_type = _get_library_type()
if library_type == 'windll':
ctypes_library = ctypes.WinDLL(_get_library_name())
else:
assert library_type == 'cdll'
ctypes_library = ctypes.CDLL(_get_library_name())
except OSError:
raise errors.DriverNotInstalledError()
_instance = _library.Library(ctypes_library)
return _instance
Returns the library.Library singleton for niswitch.
'''
global _instance
global _instance_lock
with _instance_lock:
if _instance is None:
try:
library_type = _get_library_type()
if library_type == 'windll':
ctypes_library = ctypes.WinDLL(_get_library_name())
else:
assert library_type == 'cdll'
ctypes_library = ctypes.CDLL(_get_library_name())
except OSError:
raise errors.DriverNotInstalledError()
_instance = _library.Library(ctypes_library)
return _instance
def _get_library_name():
try:
return ctypes.util.find_library(_library_info[platform.system()][platform.architecture()[0]]['name']) # We find and return full path to the DLL
except KeyError:
raise errors.UnsupportedConfigurationError
def _get_library_name():
try:
return _library_info[platform.system()][platform.architecture()[0]]['name']
except KeyError:
raise errors.UnsupportedConfigurationError
def _get_error_description(self, error_code):
'''_get_error_description
Returns the error description.
'''
try:
_, error_string = self._get_error()
return error_string
except errors.Error:
pass
try:
'''
It is expected for _get_error to raise when the session is invalid
(IVI spec requires GetError to fail).
Use _error_message instead. It doesn't require a session.
'''
error_string = self._error_message(error_code)
return error_string
except errors.Error:
return "Failed to retrieve error description."
def _get_library_type():
try:
return _library_info[platform.system()][platform.architecture()[0]]['type']
except KeyError:
raise errors.UnsupportedConfigurationError
Each instance should return a list of strings, without prefix
- '0' --> ['0']
- 0 --> ['0']
- '0, 1' --> ['0', '1']
- 'ScriptTrigger0, ScriptTrigger1' --> ['0', '1']
- '0-1' --> ['0', '1']
- '0:1' --> ['0', '1']
- '0-1,4' --> ['0', '1', '4']
- range(0, 2) --> ['0', '1']
- slice(0, 2) --> ['0', '1']
- (0, 1, 4) --> ['0', '1', '4']
- ('0-1', 4) --> ['0', '1', '4']
- (slice(0, 1), '2', [4, '5-6'], '7-9', '11:14', '16, 17') -->
['0', '2', '4', '5', '6', '7', '8', '9', '11', '12', '13', '14', '16', '17']
'''
raise errors.InvalidRepeatedCapabilityError('Invalid type', type(arg))