Error code: File access error, which means file cannot be found or be opened.

Error code: Data format error.

Error code: License authorization error.

Error code: Incorrect password error.

Error code: Unsupported security scheme error.

Error code: Success, which means no error.

Error code: Unknown error.

Page mode: full screen - with no menu bar, no windows controls and no any other windows visible.

Page mode: unknown.

Page mode: attachments panel visible.

Page mode: use none, which means neither document outline nor thumbnail images visible.

Page mode: optional content group panel visible.

Page mode: document outline visible.

Page mode: thumbnail images visible.

Flatten operation failed.

There is nothing can be flatten.

Flatten operation succeed.