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I have File Promises implemented in a Cocoa app that allows dragging images from a view and dropping them to folders on the machine or to apps like preview or evernote. In the past this has worked well using the NSDraggingSource delegate and 'namesOfPromisedFilesDropped' method. This method would return the drop location and would allow me to write the image data directly there. So when dropping to an application icon like preview, or within an app like evernote, the file would be written and the app would either load or the image would simply show within.

Unfortunately this method was deprecated in 10.13 so it no longer gets called in new OS versions. Instead I've switched over to using the filePromiseProvider writePromiseTo url method of the "NSFilePromiseProviderDelegate" delegate. This method gets called, and the image data is processed. I get the destination URL and attempt to write the image data to this location. This works perfectly fine when simply dragging to folders on the Mac. But, when dragging to other app icons like Preview.app, or directly to a folder in Evernote, I get an error 'Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"'.

I've attempted this using full URLs, and, URL paths. Regardless of either, when dragging to other apps it simply will not allow the drop or creation of the file at that location.

Is there some entitlement that may be missing? I've even attempted the Apple source code found here with the same error: File Promises Source

Here is the code I'm using now that's returning the error with inability to write to outside app locations. This only works for dragging to folders on the computer.

extension DragDropContainerView: NSFilePromiseProviderDelegate 
 internal func filePromiseProvider(_ filePromiseProvider: NSFilePromiseProvider, fileNameForType fileType: String) -> String 
 let fileName = NameFormatter.getFormattedNameFromDate() + "." + fileType.getFileType().typeIdentifier
 return fileName
 

 internal func operationQueue(for filePromiseProvider: NSFilePromiseProvider) -> OperationQueue 
 return workQueue
 

 internal func filePromiseProvider(_ filePromiseProvider: NSFilePromiseProvider, writePromiseTo url: URL, completionHandler: @escaping (Error?) -> Void) 
 if let snapshot = filePromiseProvider.userInfo as? SnapshotItem 
 if let data = snapshot.representationData 
 do 
 try data.write(to: url)
 completionHandler(nil)
 catch 
 completionHandler(error)
 
 
 
 

Any help on this issue would be great. Ultimately, I simply want to be able to drag the image to an app and have that app accept the drag. This used to work but no longer does.