Hi, because you defined the "attributes" as fields (eg. private class instance variable) and not a properties.
See https://wiki.gnome.org/Projects/Vala/Tutorial#Properties for more details. Try to change the Test class as: public class Test : GLib.Object, Saveable { public string name { get; private set; } public int zahl { get; private set; } private List<string> liste; public bool boolean { get; set; } protected uint16 kleine; internal int32 integ; public Test (string name, int zahl, List<string> liste) { this.name = name; this.zahl = zahl; this.liste = liste.copy (); } } you should at least see the name, zahl and boolean properties listed when calling the save_object function. Ciao, Andrea On Mon, Mar 23, 2015 at 12:15 PM, Philipp Trommler < keinerschreibtmir...@msn.com> wrote: > Hi! > > This is my first post on this list so I just want to say hello to > everybody. My name is Philipp Trommler, I'm from Dresden, Germany and > I'm programming Vala as a hobby. I really like Vala as I like the > syntax, the fact that it's performant and the good integration into the > gnome ecosystem. In the last days I wanted to dig a bit deeper into > serious Vala programming what leads me to my question: > > What are common ways to access an object's attributes? I checked and > tried `GLib.ParamSpec` but receiving an empty array all the time. Is > there any other method? > > The background is that I want to save an object's attributes into a > file. Alternatively I would save the whole object (that's what I tried > before, without luck, because I can't figure out how to access all of > the object's parts in memory), but accessing the attributes would be > enough for now. > > Maybe I'm just doing something wrong, so here's my code: > > ``` > public interface Saveable : GLib.Object { > public virtual void save_object (string filename) { > unowned GLib.ObjectClass object_class = this.get_class (); > GLib.File file = GLib.File.new_for_path (filename); > GLib.FileOutputStream file_output_stream = file.create > (GLib.FileCreateFlags.PRIVATE | > GLib.FileCreateFlags.REPLACE_DESTINATION); > foreach (GLib.ParamSpec param_spec in > object_class.list_properties ()) > { > stdout.printf ("%s\n", param_spec.get_name ()); > } > } > } > > public class Test : GLib.Object, Saveable { > private string name; > private int zahl; > private List<string> liste; > > public bool boolean; > protected uint16 kleine; > > internal int32 integ; > > public Test (string name, int zahl, List<string> liste) { > this.name = name; > this.zahl = zahl; > this.liste = liste.copy (); > } > } > ``` > > So, as you can see, the class `Test` has some attributes. Why can't I > access any of them? > > Greetings, > Philipp. > > _______________________________________________ > vala-list mailing list > vala-list@gnome.org > https://mail.gnome.org/mailman/listinfo/vala-list > > _______________________________________________ vala-list mailing list vala-list@gnome.org https://mail.gnome.org/mailman/listinfo/vala-list
