How to use vectors to set attributes
Intended audience: developers, Programming language: c++
This page contains examples on how to use C++ vectors to set attribute values on the servers side.
Warning
Tango is optimized not to copy data. For this reason all the attribute set_value() methods only take pointers as input. If you are going to use C++ vectors, you should be aware of the fact that you are going to copy the data! This might slow down execution time when working with large amount of data.
Examples for a vector of short and a vector of string:
1void MyClass::read_Spectrum(Tango::Attribute &attr)
2{
3 DEBUG_STREAM << "MyClass::read_Spectrum() entering... "<< endl;
4
5 vector<Tango::DevShort> val;
6 val.push_back(1);
7 val.push_back(2);
8 val.push_back(3);
9
10 // data copy !!
11 Tango::DevVarShortArray tmp_seq;
12 tmp_seq << val;
13
14 attr.set_value (tmp_seq.get_buffer(), tmp_seq.length());
15}
1void MyClass::read_StringSpectrum(Tango::Attribute &attr)
2{
3 DEBUG_STREAM << "MyClass::read_StringSpectrum() entering... "<< endl;
4
5 vector<string> val;
6 val.push_back("Hello");
7 val.push_back("cruel");
8 val.push_back("world!");
9
10 // data copy !!
11 Tango::DevVarStringArray tmp_seq;
12 tmp_seq << val;
13
14 attr.set_value (tmp_seq.get_buffer(), tmp_seq.length());
15}