在沙盒（电子）应用程序中执行qlmanage不起作用

Question

My setup is an electron app on macOs. I am using exec-sh to run $ qlmanage ... to generate thumbnails. It all works fine, except when I sign the app and set the sandbox entitlements to true. I tried everything, but nothing works:

• added com.apple.security.files.user-selected.executable to my plist
• copied the Image.qlgenerator Plugin into my app (in build process) and force the command to use this generator
• set folder permissions (but other commands like mkdir or create/write files are working)
• all combinations of qlmanage options

If I set com.apple.security.app-sandbox to false it works. The error log is pretty useless to me:

Error: Shell command exit with non zero code: 255

I am pretty unsure if it is even possible to run $ qlmanage inside a sandboxed app...

Answer 1

To get a Quicklook image from a file, you'd rather use

CGImageRef QLThumbnailImageCreate(CFAllocatorRef allocator, CFURLRef url, CGSize maxThumbnailSize, CFDictionaryRef options);

This will return an CGImage that you may use as a thumbnail. See documentation here: https://developer.apple.com/documentation/quicklook/1402623-qlthumbnailimagecreate