On 3/12/20 9:55 AM, Gabriel Zachmann via Cocoa-dev wrote:
In my app, I collect lists of files that reside on an external disk. When the user opens the directory of the files, I create a security-scoped bookmark like this:directoryBookmark_ = [dir bookmarkDataWithOptions: NSURLBookmarkCreationWithSecurityScope includingResourceValuesForKeys: nil relativeToURL: nil error: &systemError]; Next time, the app runs, I resolve the bookmark like this: directoryLocation_ = [NSURL URLByResolvingBookmarkData: directoryBookmark_ options: NSURLBookmarkResolutionWithSecurityScope relativeToURL: nil bookmarkDataIsStale: & isStale error: & error]; At some later point, my app wants to delete one of the files in that directory (or sub-directory), like this: NSString * abs_path = [self absolutePathFor: filename_]; BOOL success = [self deleteFile: abs_path ]; This does not work. In the log, I get the error message: Failed to delete /Volumes/.../image.jpg: “image.jpg” couldn’t be moved to the trash because you don’t have permission to access it.! I then try to get more info about the problem using this code: NSURL * imgurl = [NSURL fileURLWithPath: abs_path isDirectory: NO]; NSError * error; NSFileHandle * fileHandle = [NSFileHandle fileHandleForUpdatingURL: imgurl error: & error]; But it always returns a valid fileHandle, i.e., there is no error. I selected "Read/Write" in the "User Selected File" entitlement. Of course, everything works fine when the files reside on my local disk (even across multiple invocations of the app). The external disk is just a hard disk connected via USB to my laptop. Deleting the files manually on the external hard disk works, of course. Does anyone have an idea what mistake I might be making? Or is there a way to get the necessary permission?
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