Re: Preference Weirdness

Posted by Michael Schmid on Jun 17, 2010; 1:33pm
URL: http://imagej.273.s1.nabble.com/Tracing-neurons-in-Sholl-analysis-tp3687379p3687385.html

Hi Michael,

there are two types of prefs commands, those adding KEY_PREFIX (a  
period) to the key, and those that don't and also search the Props  
inside the ij.jar. It seems that the latter are meant for ImageJ  
internal variables; getString is one of these.

Prefs.set(prefName, prefValue) adds a period, hence, your key is  
'.wacky.myval'

So it seems you should use Prefs.get instead of Prefs.getString:
   prefValue = Prefs.get(prefName, "A default value that should not  
be seen!!!");

Michael
________________________________________________________________

On 17 Jun 2010, at 15:11, [hidden email] wrote:

> Can anyone explain what I'm doing wrong regarding using the ImageJ  
> preferences?
>
> After observing some strange behaviour I wrote this little
> test plugin.
>
> After setting a preference it then appears to fail to read it back.  
> The IJ_Prefs.txt file gets written correctly though.
>
> I've tried deleting the IJ_Prefs.txt file (incase there was some  
> weird corruption). I'm running under OS-X with 10.5.8. I get the  
> same result with ImageJ and ImageJ64.
>
> I must be doing something really silly, but I just cannot see it!
>
> ----------------------------------------------------------------------
> -----
>
> import ij.*;
> import ij.plugin.*;
>
> public class My_Plugin implements PlugIn {
>
> public void run(String arg) {
> IJ.log("IJ.getVersion()=" + IJ.getVersion());
>
> final String prefName =  "wacky.myval";
> String prefValue = Prefs.getString(prefName, "Default Value");
>
> IJ.log(String.format("pref '%s' is '%s'\n", prefName, prefValue));
>
> prefValue = "New Value";
> IJ.log(String.format("Setting pref '%s' to '%s'", prefName,  
> prefValue));
> Prefs.set(prefName, prefValue);
>
> Prefs.savePreferences();
>
> prefValue = Prefs.getString(prefName, "A default value that  
> should not be seen!!!");
> IJ.log(String.format("pref '%s' is '%s'\n", prefName, prefValue));
> }
> }
>
> /*
> --- Output -----------------------------
> IJ.getVersion()=1.44c
> pref 'wacky.myval' is 'Default Value'
> Setting pref 'wacky.myval' to 'New Value'
> pref 'wacky.myval' is 'A default value that should not be seen!!!'
> ------------------------------------------
>
> After execution, the IJ_Prefs.txt file contains the line
> .wacky.myval=NewValue
> */
>
>
>
> Michael Ellis
> Managing Director
> Digital Scientific UK Ltd.
> http://www.dsuk.co.uk
> [hidden email]
> tel: [phone]
> fax: [phone]
>
> Sheraton House
> Castle Park
> Cambridge
> CB3 0AX
>
>
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