How to extract read and set values from a scalar attribute
Intended audience: developers, Programming language: c++
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.
1Tango::DevVarDoubleArray * attr_val;
2Tango::DevDouble read_value, set_value;
3try {
4 Tango::DeviceAttribute dev_attr = tg_device_proxy->read_attribute("attr_name");
5 dev_attr >> attr_val;
6 read_value = (*attr_val)[0];
7 set_value = (*attr_val)[1];
8 delete attr_val;
9}
10catch(Tango::DevFailed &e){
11 Tango::Except::print_exception(e);
12 throw;
13}
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.