def getw(self, req_type=None, count=None):
"""Return a value or array of values from a channel.
Parameters:
req_type: database request type. Defaults to be the native data type.
count: number of data values to read, Defaults to be the native count.
"""
updated = [False]
value = [0]
def update_value(valstat):
if valstat is None:
return
try:
value[0] = valstat[0]
finally:
updated[0] = True
if req_type is None: req_type = ca.dbf_type_to_DBR(self.field_type())
if count is None: count = 0
try:
ca.get(self.__chid, update_value, req_type, count)
except ca.error,msg:
raise CaChannelException,msg
def array_get_callback(self, req_type, count, callback, *user_args):
"""Read a value or array of values from a channel and execute the user
supplied callback after the get has completed.
Parameters:
req_type: database request type. Defaults to be the native data type.
count: number of data values to read, Defaults to be the native count.
callback: function called when the get is completed.
*user_args: user provided arguments that are passed to callback when
it is invoked.
>>> def getCB(epicsArgs, userArgs):
... for item in sorted(epicsArgs.keys()):
... if item.startswith('pv_'):
... print item,epicsArgs[item]
>>> chan = CaChannel('catest')
>>> chan.searchw()
>>> chan.putw(145)
>>> chan.array_get_callback(ca.DBR_CTRL_DOUBLE, 1, getCB)
>>> status = chan.pend_event(1)
pv_loalarmlim -20.0
pv_loctrllim 0.0
pv_lodislim 0.0
pv_lowarnlim -10.0
pv_precision 3
pv_seconds 0.0
pv_severity 2
pv_status 3
pv_units mm
pv_upalarmlim 20.0
pv_upctrllim 0.0
pv_updislim 0.0
pv_upwarnlim 10.0
pv_value 145.0
>>> chan = CaChannel('cabo')
>>> chan.searchw()
>>> chan.putw(0)
>>> chan.array_get_callback(ca.DBR_CTRL_ENUM, 1, getCB)
>>> status = chan.pend_event(1)
pv_nostrings 2
pv_seconds 0.0
pv_severity 0
pv_statestrings ('Done', 'Busy')
pv_status 0
pv_value 0
"""
if req_type is None: req_type = ca.dbf_type_to_DBR(self.field_type())
if count is None: count = 0
self._callbacks['getCB']=(callback, user_args)
try:
status=ca.get(self.__chid, self._get_callback, req_type, count)
except ca.error,msg:
raise CaChannelException,msg
def array_get_callback(self, req_type, count, callback, *user_args):
"""Read a value or array of values from a channel and execute the user
supplied callback after the get has completed.
Parameters:
req_type: database request type. Defaults to be the native data type.
count: number of data values to read, Defaults to be the native count.
callback: function called when the get is completed.
*user_args: user provided arguments that are passed to callback when
it is invoked.
>>> def getCB(epicsArgs, userArgs):
... for item in sorted(epicsArgs.keys()):
... if item.startswith('pv_'):
... print item,epicsArgs[item]
>>> chan = CaChannel('catest')
>>> chan.searchw()
>>> chan.putw(145)
>>> chan.array_get_callback(ca.DBR_CTRL_DOUBLE, 1, getCB)
>>> status = chan.pend_event(1)
pv_loalarmlim -20.0
pv_loctrllim 0.0
pv_lodislim 0.0
pv_lowarnlim -10.0
pv_precision 3
pv_seconds 0.0
pv_severity 2
pv_status 3
pv_units mm
pv_upalarmlim 20.0
pv_upctrllim 0.0
pv_updislim 0.0
pv_upwarnlim 10.0
pv_value 145.0
>>> chan = CaChannel('cabo')
>>> chan.searchw()
>>> chan.putw(0)
>>> chan.array_get_callback(ca.DBR_CTRL_ENUM, 1, getCB)
>>> status = chan.pend_event(1)
pv_nostrings 2
pv_seconds 0.0
pv_severity 0
pv_statestrings ('Done', 'Busy')
pv_status 0
pv_value 0
"""
if req_type is None: req_type = ca.dbf_type_to_DBR(self.field_type())
if count is None: count = 0
self._callbacks['getCB'] = (callback, user_args)
try:
status = ca.get(self.__chid, self._get_callback, req_type, count)
except ca.error, msg:
raise CaChannelException, msg
def getw(self, req_type=None, count=None):
"""Return a value or array of values from a channel.
Parameters:
req_type: database request type. Defaults to be the native data type.
count: number of data values to read, Defaults to be the native count.
"""
updated = [False]
value = [0]
def update_value(valstat):
if valstat is None:
return
try:
value[0] = valstat[0]
finally:
updated[0] = True
if req_type is None: req_type = ca.dbf_type_to_DBR(self.field_type())
if count is None: count = 0
try:
ca.get(self.__chid, update_value, req_type, count)
except ca.error, msg:
raise CaChannelException, msg