File.createReadwrite

Creates a new file and returns a stream for reading and writing to it. The file must not already exist.

By default files created are generally readable by everyone, but if you pass [gio.types.FileCreateFlags.Private] in flags the file will be made readable only to the current user, to the level that is supported on the target filesystem.

If cancellable is not null, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error [gio.types.IOErrorEnum.Cancelled] will be returned.

If a file or directory with this name already exists, the [gio.types.IOErrorEnum.Exists] error will be returned. Some file systems don't allow all file names, and may return an [gio.types.IOErrorEnum.InvalidFilename] error, and if the name is too long, [gio.types.IOErrorEnum.FilenameTooLong] will be returned. Other errors are possible too, and depend on what kind of filesystem the file is on.

Note that in many non-local file cases read and write streams are not supported, so make sure you really need to do read and write streaming, rather than just opening for reading or writing.