There is often a need to load a configuration from a text file on the disk or write configuration into such a file. This could be calibration data, ip-numbers, etc. This can be achieved in EEROS by packing this configuration data into a class as follows:
TestConfig : public eeros::config::FileConfig { public: TestConfig(const char *name) : FileConfig(name), b(2.2), d("127.0.0.0") { add("id", a); add("offset", b); add("initValues", c); add("ip", d); } int a; double b; std::array<double, 3> c; std::string d; };
The above example shows such a configuration class. When an object of this class is created, some of the values are initialized with default values and then added to the configuration.
TestConfig configFile("config.txt"); // choose an appropriate path
If a configuration file exists at the given location, you can load the values from there and overwrite the default values with the values given in the file.
TestConfig configFile("config.txt"); // choose an appropriate path configFile.load();
Valid name for the identifiers of the values must not include spaces. 'myText10' is valid while 'my_text 10' is not!
You can manually create a suitable configuration file at the given location, e.g.
id = 1 offset = 2.200000 initValues = 0.1, 0.4, 0.3 ip = 127.0.0.0
or you could save the values of your configuration class object into the file (and possible change an existing content).
configFile.save();
It's also possible to save to or restore from another file by writing:
configFile.save("config2.txt"); configFile.load("config2.txt");
There is a complete example in the example directory of EEROS. Open a shell in the build directory of your EEROS library and run
$ ./examples/config/configExample