| Error disposing image resource [message #521035] |
Tue, 16 March 2010 09:53  |
 Marc T.
Messages: 17
Registered: November 2009 |
Junior Member |
|
|
Hello,
I'm trying to display an image as Label background. Everything works fine, but when I dispose the image I get:
java.lang.IllegalStateException: A factory-created resource cannot be disposed.
at org.eclipse.swt.graphics.Resource.dispose(Resource.java:80)
My code to allocate the image is:
ImageDescriptor imgDescr = AbstractUIPlugin .imageDescriptorFromPlugin(Activator.PLUGIN_ID,
"icons/aboutdialogimage.png");
Image img=imgDescr.createImage();
...
img.dispose(); // Exception here
The javadoc for createImage() explicit states, that every call creates an new image and that the image must be released by calling dispose():
Note: this method differs from createResource(Device) in that the returned image
must be disposed directly, whereas an image obtained from createResource(...)
must be disposed by calling destroyResource(...). It is not possible to
mix-and-match. If you obtained the Image from this method, you must not dispose
it by calling destroyResource. Clients are encouraged to use
create/destroyResource and downcast the result to Image rather than using
createImage.
Any idea ?
Regards
Marc
[Updated on: Tue, 16 March 2010 09:54] Report message to a moderator |
|
|
| Re: Error disposing image resource [message #521047 is a reply to message #521035] |
Tue, 16 March 2010 10:22  |
Ivan Furnadjiev
Messages: 2427
Registered: July 2009
Location: Sofia, Bulgaria |
Senior Member |
|
|
Hi Marc,
this is a known issue. There is already a bug opened to keep track on it:
305136: Images from Descriptor are not disposable
https://bugs.eclipse.org/bugs/show_bug.cgi?id=305136
Best,
Ivan
On 03/16/2010 11:53 AM, Marc42 wrote:
> Hello,
>
> I'm trying to display an image as Label background. Everything works
> fine, but when I dispose the image I get:
>
> java.lang.IllegalStateException: A factory-created resource cannot be
> disposed.
> at org.eclipse.swt.graphics.Resource.dispose(Resource.java:80)
>
>
> My code to allocate the image is:
>
> ImageDescriptor imgDescr = AbstractUIPlugin
> .imageDescriptorFromPlugin(Activator.PLUGIN_ID,
> "icons/aboutdialogimage.png");
>
> Image img=imgSescr.createImage();
> ..
>
> img.dispose(); // Exception here
>
>
>
>
> The javadoc for createImage() explicit states, that every call creates
> an new image and that the image must be released by calling dispose():
>
> Note: this method differs from createResource(Device) in that the
> returned image
> must be disposed directly, whereas an image obtained from
> createResource(...)
> must be disposed by calling destroyResource(...). It is not possible
> to mix-and-match. If you obtained the Image from this method, you must
> not dispose
> it by calling destroyResource. Clients are encouraged to use
> create/destroyResource and downcast the result to Image rather than
> using createImage.
>
>
>
> Any idea ?
>
> Regards
>
> Marc
>
>
>
>
>
|
|
|
|
| Re: Error disposing image resource [message #521133 is a reply to message #521048] |
Tue, 16 March 2010 09:50 |
Ivan Furnadjiev
Messages: 2427
Registered: July 2009
Location: Sofia, Bulgaria |
Senior Member |
|
|
Hi Marc,
in RAP there are two "types" of resources:
1. a factory created resources - created by Graphics.getXXX methods.
These resources are shared between the sessions and can't be disposed (
device is null ).
2. and "standard" one - created like: new Image( device, ...). Their
device is not null and you can dispose them as usual.
As I mentioned in my previous post, currently, images created from
ImageDescriptor can't be disposed (see bug 305136 ), because they are
factory created images.
Best,
Ivan
On 03/16/2010 12:35 PM, Marc42 wrote:
> Hello,
>
> by further tracing into this problem I found:
>
> - Image.dispose() is Resource.dispose().
> - This throws the exception, if the property 'device' is null, which
> it seems to be in every case.
>
> I tried calling createImage() with providing a device:
>
> createImage(Display.getCurrent())
>
>
> Same problem: property 'device' is still null and the exception it
> thrown.
>
> The Image is somehow cached. I guess that createImage() behaves like
> createResource().
>
> May be this is a bug ?
>
> Regards
>
> Marc
|
|
|
Powered by
FUDForum. Page generated in 0.04647 seconds
] 
Search
Help
Register
Login
Home
