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23

This "blank Quicklook image" Bug is caused by the activation of the undocumented TextSelection-Feature. As soon as I deleted that feature with this terminal command the blank images were never seen again ;-) defaults delete com.apple.finder QLEnableTextSelection; killall Finder; If this delete-command doesn't work for you, you could try to disable the ...


3

Open Terminal, and type the following: qlmanage -m plugins This will give you a fairly long list of all your active QuickLook plugins: The types listed there might look a little strange, like com.apple.safari.bookmark. Those are Apple Uniform Type Identifiers or short UTType identifiers, and there is a list of the default ones available from Apple ...


3

Known bug on Apple's Bug Radar as Bug # 19639311 https://discussions.apple.com/thread/6803599 qlmanage -t produces a small thumbnail of the HMTL file qlmanage -p just gives me a blank quicklook preview This doesn't happen with a .jpg file I used as a control sample


3

QuickLook's API is not all that great. It's meant for documents that can be displayed in a single frame, like text or photographs. There is no way that I know of (or apparently anyone else) to have QuickLook play movies. Apple obviously can, but they're clearly using APIs that the rest of us do not have access to.


2

It's a bug for sure, but the root-cause is a cached search in Finder which tries to find every file on the system and runs out of resource handles or something. It's an obvious use-case in Finder that I'm astonished nobody has spotted yet (but I have been a Unix/Linux system developer for 20 years). When Finder is doing it, you can both get rid of the ...


2

Please notice that the activation of the "Text-Selection-In-Quicklook"-Feature could lead to the bug described in this question: QuickLook having problems displaying some images


2

You probably have iA Writer installed on your Mac. They recently updated their application to include a Quick Look plugin to show some file types, including .txt, as multi markdown HTML in the Quick Look preview. People have complained that this is intrusive, and the developers have promised a fix in an upcoming update: ...


2

Install QLStephen, a QuickLook plugin that enables viewing of text files with arbitrary filetypes.


2

also installable via brew cask install qlstephen


1

For OS X 10.8.5, the method below works well enough for me to stop looking for a better solution. The file modification has survived reboots, but it might need to be reset after Apple updates. Edit this sandbox profile as an admin: /usr/share/sandbox/quicklook-satellite.sb Add the file type deny rules at the end and save: (deny file-read* (regex ...


1

This answer is coming a lot later, but I had to figure this out for myself. Go to where Writer is located Go to where Writer is located. /Applications/ Right click and show package contents Enter Library Delete QuickLook Restart your computer or enter into command line qlmanage -r


1

Quick Look doesn't make web requests, so it can't show the contents of the webpage without opening it. The question you linked was asking about .html files, with the actual source saved locally. .url files only include a URL, so without downloading the page it can't render anything. You can still use .html or .webarchive files and they will be rendered in ...


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For those still looking for this answer, a simple reboot did the trick for me.


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Instead of rebooting, you can simply enter "killall quicklookd" in Terminal. That fixed it.


1

QLVideo can display metadata, thumbnails and static QuickLook previews of H.265 video (as long as the H.265 stream is packaged within a suitable container e.g. .mkv, .ts, etc). Given the architecture of the QuickLook and QuickLookUI frameworks only Apple can add support for playable QuickLook previews. There's some discussion of this under QLVideo Issue#3.


1

I had the same problem and I solved it by noticing that a wrong (corrupted or so) qlgenerator was used to generate the quicklook preview of plain-text files. To do this, you can type, in a terminal, qlmanage -m plugins and search for the public.plain-textstring (e.g. using grep), so you should get something similar to qlmanage -m plugins | grep ...


1

I'm using Yosemite. Tried all those approaches above, but they didn't last for long. But I did find one approach that DID work. Hold down the Option key before pressing Quick Look (the icon will change). The pictures will go to full screen. Then it won't fail to display. Press Esc to quit.


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People can develop plugins to allow Quick Look to support more file types. You can find Apple's Quick Look documentation here. Luckily though Timac (aka Alexandre Colucci) has already created one. You can find Timac's Quick Look plugin for strings files here. Just download the compiled plugin, copy it to your /Library/QuickLook folder and run the qlmanage ...


1

Quick Look can be set to allow copying of text. Launch Terminal and type the following command: defaults write com.apple.finder QLEnableTextSelection -bool true Then restart the Finder with the following command: killall Finder After selecting use the keyboard ⌘+C to copy. Read more at Cult of Mac I hope this helps too.



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