The following example will show how you can extract the read and set values from a scalar attribute.
In the example, the attribute is a Tango::DevDouble.
Tango::DevVarDoubleArray * attr_val; Tango::DevDouble read_value,set_value; try { Tango::DeviceAttribute dev_attr = tg_device_proxy->read_attribute("attr_name"); dev_attr >> attr_val; read_value = (*attr_val)[0]; set_value = (*attr_val)[1]; delete attr_val; } catch(Tango::DevFailed &e){ Tango::Except::print_exception(e); throw; }
Note: The operator >> will allocate the memory for the Tango::DevVarDoubleArray but the programmer should free this memory when the work is done with this variable.