I have a file I want to download that is displayed as a preview in a webview. I can access the html content of the webview from outside of it. I would like to save the file that is being previewed as a binary file. Given document.body.innerHTML, is there any way to recover the binary data or I need the original data from the request?

The preview looks something like this

Thanks for any help

CodePudding user response：

"What is the format of the string that is being displayed" - The browser has done it's best to render the binary data as if it was a unicode encoded string, probably UTF-8.

It's possible/likely that here are byte sequences that do not match up to valid unicode characters, depending on the exact encoding used. This will cause those sequences to be replaced by a unicode replacement character preventing the original binary data from being recoverable from the preview.

Your best bet bet would be to retreive the original data.