Hi! Thanks for the advice, it works. But isn't there a more general way to achieve my goal? A way to access all the data from an instance? And why does the `sizeof` function doesn't work correctly for classes? I looked into the generated C sources and understand that a Vala class is split into several structs but my knowledge of C (and the GObject system in special) isn't that good, so I cannot implement a save function in C myself (at least not yet and I would still prefer to do it in Vala). But from a user's point of view I have to say that I expected the normal `sizeof` to work with all data types and still think so. Where is the sense of a `sizeof` function for data types which size is already known? Why should I test everytime at runtime for the size of e.g. an int? Don't get me wrong, I still like Vala ;-) But I'm a little bit shocked that there seems to be no way to simply read a class directly from memory.
Hope somebody proofs me wrong, Philipp. Am Montag, den 23.03.2015, 13:10 +0100 schrieb Andrea Del Signore: > 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 > > >
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