how to get ids/names/guids of selected pictures in picture library - select

I have created a picture library and selected some pictures (through a check box).
I have also added a menu item 'Download to my App' in the 'Actions' menu item in the standard toolbar.
Now, on clicking the 'Download to my App' option, I want to download the selected pictures programatically to my application.
So how can I get the ids/names/guids of selected pictures so that I can get SPListItem or SPFile objects of pictures.
Is there any token that I can get like ListId/ItemId in url?

Did you create a check box for each picture that you wanted to select? If so, how do you know which picture is associated with each check box? Because surely that's the key to understanding the identity you need to do the download, isn't it?

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one more example.
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Projecting is fetching automatically

I am using spring tool suite for development.one page is opened,and when i clicking on the page to edit,project is fetching completely.I donot want to fetch the project.
Before i click on the page,following is the image
enter image description here
After i have clicked the page,following is the image.
enter image description here
I'm having some trouble understanding what you are asking, but... I think what you want is to not have your editor 'linked' with the package explorer.
You can do that by toggling the button at the top of the package explorer, with left-and-right arrows:

In Shopify, how do I add mouseover to a non-product page?

I am building my site in shopify. On the "about us" page I have photos of each team member. I would like to be able to click on the photo to show a JPG (which is a postcard of employee title and interesting facts). Is there a way to add a mouseover feature on an image that is not a product? We are using the minimal theme. As point of reference we got this idea from www.scoutbags.com/about-us
On that site they use a hover feature to change the photo and then a click through to the postcard. We are skipping the second photo to try to keep it simple/doable.
Here's info on how to enable lightboxes on your images.
https://docs.shopify.com/themes/customization/colors-images-and-video/add-lightbox-to-images
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Probably the easiest way I can think of to get the result that you want without having to resort to changing any Theme Files would be this:
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