http://imagej.273.s1.nabble.com/Issue-about-ImagePlus-tp5024349p5024354.html
did not provide the output. Albeit, imp points to the same ImagePlus
> Dear Fred,
> I'm not sure to agree with your explanations, especially when looking at
> the output of the following code:
> public void run(String arg) {
> ImagePlus imp =
> IJ.openImage("
https://imagej.net/images/bat-cochlea-volume.zip");
> IJ.log("" + imp);
> imp.close();
> IJ.log("" + imp);
> imp.show();
> IJ.log("" + imp);
> // imp = HyperStackConverter.toHyperStack(imp, 2, 3, 19, "default",
> "Grayscale");
> // IJ.log("" + imp);
> imp.close();
> IJ.log("" + imp);
> }
> As for the static ImagePlus question, if you look at the
> HyperStackConverter API under the following link:
>
https://imagej.nih.gov/ij/developer/api/ij/plugin/HyperStackConverter.html> you will see that the toHyperStack method is outputing a static ImagePlus
> and not an ImagePlus like for example the getImagePlus method of the
> ImageWindow API:
>
https://imagej.nih.gov/ij/developer/api/ij/gui/ImageWindow.html> My best regards,
> Philippe
>
> ----- Mail original -----
> De: "Fred Damen" <
[hidden email]>
> Ã: "imagej" <
[hidden email]>
> Envoyé: Dimanche 10 Janvier 2021 23:45:19
> Objet: Re: Issue about ImagePlus
>
> Greetings Philippe,
>
> Even though Java considers pointers evil and hides them from you, object
> variables are essentially what C++ would call smart pointers. A smart
> pointer is an middleman object that functions as a pointer and keeps a
> reference count, so that when the count goes to zero the actual referred
> object is deleted.
> So in case one imp1,
> first points to the ImagePlus that you open from a website,
> then imp1.show increased the ref count on website ImagePlus,
> then imp1.close decreased the ref count on website ImagePlus,
> then existing run's scope decreased the ref count on website ImagePlus
> to zero and thus allowing garbage collection to do its job.
>
> In case two imp1,
> first points to the ImagePlus that you open from a website,
> then imp1.show increased the ref count on website ImagePlus,
> then imp1 = HyperStack... causes imp1 to drop its reference to the
> website ImagePlus from run's scope, decreasing ref count by one,
> then imp1.close is probably a noop as HyperStack... ImagePlus has not
> been show(en),
> then exiting run's scope decreased the ref count on HyperStack...
> ImagePlus to zero, thus allowing garbage collection to do its job.
> N.B. website ImagePlus still has a ref count of one due to it being
> show(en) and never having close called on it.
>
> Not sure what you mean by "HyperStackConverter.toHyperStack method is
> creating a static ImagePlus and not a ImagePlus" as there is no "static"
> involved.
>
> Enjoy,
>
> Fred
>
> On Sun, January 10, 2021 1:12 pm, CARL Philippe (LBP) wrote:
>> Dear all,
>> Happy new year for everybody (hoping that it will be better than the
>> last
>> one)!
>> Empirically I found an issue that I'm not really able to understand.
>> So the following code is working as expected (i.e. the imp1 gets closed
>> as
>> expected):
>> public class My_Plugin1 implements PlugIn {
>> ImagePlus imp1, imp2, imp3;
>> public void run(String arg) {
>> imp1 =
>> IJ.openImage("
https://imagej.net/images/bat-cochlea-volume.zip");
>> imp1.show();
>> imp2 = HyperStackConverter.toHyperStack(imp1, 2, 3, 19, "default",
>> "Grayscale");
>> imp3 = SubHyperstackMaker.makeSubhyperstack(imp2, "1", "1-3",
>> "1-19");
>> imp3.show();
>> imp1.close();
>> imp2.close();
>> }
>> }
>> But with the following code:
>> public class My_Plugin2 implements PlugIn {
>> ImagePlus imp1, imp3;
>> public void run(String arg) {
>> imp1 =
>> IJ.openImage("
https://imagej.net/images/bat-cochlea-volume.zip");
>> imp1.show();
>> imp1 = HyperStackConverter.toHyperStack(imp1, 2, 3, 19, "default",
>> "Grayscale");
>> imp3 = SubHyperstackMaker.makeSubhyperstack(imp1, "1", "1-3",
>> "1-19");
>> imp3.show();
>> imp1.close();
>> }
>> }
>> the imp1 window isn't closed.
>> Is this because the HyperStackConverter.toHyperStack method is creating
>> a
>> static ImagePlus and not a ImagePlus?
>> I thank you very much in advance for your lighting on this.
>> My best regards,
>> Philippe
>>
>> --
>> ImageJ mailing list:
http://imagej.nih.gov/ij/list.html>>
>
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