golnaz nilieh wrote:
> Hello everybody!
> I'm a newbie to vala language, I faced to a strange problem recently and
> couldn't find any help in vala documentations.
> In my app, I have declared a class named "Global" in a file "global.vala":
>
> using GLib;
> public class MyApp.Global : GLib.Object {
> public static string dataDir = "/usr/local/share/";
> }
>
> And I have a "main.vala" file, whith this code inside:
>
> using GLib;
> using Gtk;
> public class MyApp.MainWindow : Window {
> static int main (string[] args) {
> stdout.printf ("all data is in: " + Global.dataDir);
> return 0;
> }
> }
>
> After compilation, I get this string in terminal:
> all data is in:
>
> Seems that Global.dataDir is empty. Where is my mistake?
> Thanks.
Non-value-type static class variables are only initialized after the
class was instantiated at least once. This behaviour is a little bit
counter-intuitive, and I hope it will change in the future.
You have several options:
- create a throw-away instance:
static int main (string[] args) {
new Global ();
stdout.printf ("all data is in: " + Global.dataDir);
return 0;
}
- call a static initialization method:
static int main (string[] args) {
Global.init ();
stdout.printf ("all data is in: " + Global.dataDir);
return 0;
}
- make 'dataDir' const, if it is not intended to change
Best regards,
Frederik
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