[GitHub] [cordova-plugin-file] peterfox1 edited a comment on issue #408: Platform android@9.0.0 running on Android 10 : getFile produces INVALID_MODIFICATION_ERR - Error code 9.

[GitBox <gi...@apache.org>]

peterfox1 edited a comment on issue #408:
URL: https://github.com/apache/cordova-plugin-file/issues/408#issuecomment-666302030


   Gave it a go saving to another location to see if it would get around that permission, seems like saving to the app data directory `cordova.file.dataDirectory` works.
   
   `fileSystem.root` seems to be outside of the app data perhaps? - I didn't realise this since the docs say "fs.root is a DirectoryEntry object that represents the persistent storage in the sandboxed file system."
   
   Also noticed:
   - If the file was created by the API 28 app, the API 29 app seems to be able to write to it, it just can't create new files.
   - Using `requestFileSystem(window.TEMPORARY` seems to work.
   
   In case it's useful for anyone else that only needs to store files in the app dir, the change to use `cordova.file.dataDirectory` is:
   
   ```js
   window.resolveLocalFileSystemURL(cordova.file.dataDirectory,	// <-----------
   	function (dirEntry) {	// <-----------
   		
   		dirEntry.getFile("test2.txt", {create: true, exclusive: false},	// <-----------
   			function(fileEntry) {	// File loaded/created
   				
   				fileEntry.createWriter(
   					function(writer) {	// Writer created
   						
   						writer.write('hello');
   						console.log('test2 it worked!');
   						
   					},
   					function(error) {	// Writer failure
   						console.log('createWriter', error);
   					}
   				);
   				
   			},
   			function(error) {	// File failure
   				console.log('getFile', error);
   			}
   		);
   	
   	},
   	function(error) { console.log('resolveLocalFileSystemURL', error); }
   );
   ```


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