After unregisterResource , why still can use the resource

hoozi

hi,

in my case , I want to dinamic Switch the resource.

so i have two rcc files, they have picture with same alias, like this

A.rcc
@
<RCC>
<qresource prefix="/">
<file alias="cover">a.png</file>
</qresource>
</RCC>
@

B.rcc
@
<RCC>
<qresource prefix="/">
<file alias="cover">b.png</file>
</qresource>
</RCC>
@

I first registerResource A.rcc , used a.png

then unregisterResource A.rcc

then,
@
Image { id: ttt }
...
ttt.source="qrc:/cover";
@
it works, used a.png . why???

then,
registerResource B.rcc
still used a.png. why???

mlong

Is the image element created after the resource file is changed? Or is it created before?

If the Image element is persistent through the changing of the resource file, try briefly setting ttt.source="" and then resetting ttt.source="qrc:/cover" again. Does it then reload the proper image?

hoozi

[quote author="mlong" date="1313012387"]Is the image element created after the resource file is changed? Or is it created before?

If the Image element is persistent through the changing of the resource file, try briefly setting ttt.source="" and then resetting ttt.source="qrc:/cover" again. Does it then reload the proper image? [/quote]

the image element created after the resource file is changed

loladiro

A resource file can only be unloaded if it's not being used. Are you sure you're not using it elsewhere?

hoozi

I can Detailed description Process :

registerResource A.rcc
createQmlObject a Image_A created , used a.png in A.rcc
then, destroy Image_A and unregisterResource A.rcc
Next process, is Confusing. a new created Image_B can set source = "qrc:/cover" , it works used a.png
then I registerResource B.rcc . a new created Image_C set source = "qrc:/cover" , it works still used a.png . why?

btw, I write a plugin that can call registerResource and unregisterResource in QML.

mbrasser

Hi,

QML does a lot of caching behind the scenes, and images are one of the things that are cached. From your description it sounds like the cached image is what is continually being used, regardless of changing the underlying resource file.

QtQuick 1.1 (not yet released, but available as the HEAD of 4.7, or with the recent 4.8 pre-releases) adds a cache property to Image that should allow you to turn off this caching, which might solve your problem.

Regards,
Michael

hoozi

Thanks for Details answers