How to read file comment field

Question

In OS X Finder there is \'Comment\' file property. It can be checked in finder by adding \'Comment\' column or edited/checked after right clicking on file or folder and sele

Answer 1

Putting the pieces together (Ken Thomases reading answer above and writing answer link) you can extend URL with a computed property with a getter and a setter to read/write comments to your files:

update: Xcode 8.2.1 • Swift 3.0.2

extension URL {
    var finderComment: String? {
        get {
            guard isFileURL else { return nil }
            return MDItemCopyAttribute(MDItemCreateWithURL(kCFAllocatorDefault, self as CFURL), kMDItemFinderComment) as? String
        }
        set {
            guard isFileURL, let newValue = newValue else { return }
            let script = "tell application \"Finder\"\n" +
                String(format: "set filePath to \"%@\" as posix file \n", absoluteString) +
                String(format: "set comment of (filePath as alias) to \"%@\" \n", newValue) +
            "end tell"
            guard let appleScript = NSAppleScript(source: script) else { return }
            var error: NSDictionary?
            appleScript.executeAndReturnError(&error)
            if let error = error {
                print(error[NSAppleScript.errorAppName] as! String)
                print(error[NSAppleScript.errorBriefMessage] as! String)
                print(error[NSAppleScript.errorMessage] as! String)
                print(error[NSAppleScript.errorNumber] as! NSNumber)
                print(error[NSAppleScript.errorRange] as! NSRange)
            }
        }
    }
}