The value of this object identifies the operation status.
opInProgress(1): The operation is ongoing.
opSuccess(2): The operation succeeds.
opGetFileError(3): Obtaining the file fails.
opInvalidDestName(4): The specified storage path is invalid.
opNoFlashSpace(5): The space in the flash memory is insufficient.
opWriteFileError(6): Writing the file fails.
opDestoryError(7): Deleting the file fails.