def __setattr__(self, key, value):
d = self.__dict__
if key in ('dev', 'optlist', 'area', 'sane_signature',
'scanner_model'):
raise AttributeError("Read-only attribute: " + key)
if key not in self.opt:
d[key] = value
return
opt = d['opt'][key]
if opt.type == _sane.TYPE_BUTTON:
raise AttributeError("Buttons don't have values: " + key)
if opt.type == _sane.TYPE_GROUP:
raise AttributeError("Groups don't have values: " + key)
if not _sane.OPTION_IS_ACTIVE(opt.cap):
raise AttributeError("Inactive option: " + key)
if not _sane.OPTION_IS_SETTABLE(opt.cap):
raise AttributeError("Option can't be set by software: " + key)
if isinstance(value, int) and opt.type == _sane.TYPE_FIXED:
# avoid annoying errors of backend if int is given instead float:
value = float(value)
result = d['dev'].set_option(opt.index, value)
# do binary AND to find if we have to reload options:
if result & _sane.INFO_RELOAD_OPTIONS:
self.__load_option_dict()
def __setattr__(self, key, value):
dev=self.__dict__['dev']
optdict=self.__dict__['opt']
if key not in optdict:
self.__dict__[key]=value ; return
opt=optdict[key]
if opt.type==TYPE_GROUP:
raise AttributeError("Groups can't be set: "+key)
if not _sane.OPTION_IS_ACTIVE(opt.cap):
raise AttributeError('Inactive option: '+key)
if not _sane.OPTION_IS_SETTABLE(opt.cap):
raise AttributeError("Option can't be set by software: "+key)
if isinstance(value, int) and opt.type == TYPE_FIXED:
# avoid annoying errors of backend if int is given instead float:
value = float(value)
self.last_opt = dev.set_option(opt.index, value)
# do binary AND to find if we have to reload options:
if self.last_opt & INFO_RELOAD_OPTIONS:
self.__load_option_dict()
def is_settable(self):
return _sane.OPTION_IS_SETTABLE(self.cap)
def is_settable(self):
"""
:returns: Whether the option is settable.
"""
return _sane.OPTION_IS_SETTABLE(self.cap)
