I have an NSFileWrapper with some content. I want to save it (writeToURL...:), add new content to it and save it again.
I would like to avoid writing again and again the same files. So, if I understood clearly, it means the option NSFileWrapperWritingAtomic is not for me. Especially as I save the file wrapper in the method
- (BOOL)writeAdditionalContent:(id)content
toURL:(NSURL *)absoluteURL
originalContentsURL:(NSURL *)absoluteOriginalContentsURL
error:(NSError *__autoreleasing *)error
(of an OSX analogue of UIManagedDocument)
and as Apple says "don't use this option in an override of -[NSDocument writeToURL:ofType:error:]".
So, I don't use this option, but updating the files from the file wrapper (I mean : saving again) fails (see below). Any idea/clue ?
Here is what I do :
1
I save it a first time with
[self.fileWrapper writeToURL:[absoluteURL URLByAppendingPathComponent:@"attached_files/"]
options:0
originalContentsURL:[absoluteOriginalContentsURL URLByAppendingPathComponent:@"attached_files/"]
error:error] ;
It works well.
My file wrapper is
/*
Initializing the file wrapper
*/
_fileWrapper = [[NSFileWrapper alloc] initDirectoryWithFileWrappers:nil] ;
[_fileWrapper setFilename:@"attached_files"] ;
[_fileWrapper setPreferredFilename:@"attached_files"] ;
2
I save a second time with the same command. I get the error
Error Domain=NSCocoaErrorDomain Code=516 "The file already exists".
The given name is actually "attached_files".
3
If I use the option NSFileWrapperWritingWithNameUpdating, I still get the same error.
4
If I use the option NSFileWrapperWritingAtomic, I don't get errors.
