Function called when a document requires a password. Return the password to try, or null to give up (aborts opening with a PdfPasswordException).
null
It is called repeatedly on each failed attempt until it returns null or a correct password, so it may prompt the user anew each time.
Function called when a document requires a password. Return the password to try, or
nullto give up (aborts opening with a PdfPasswordException).It is called repeatedly on each failed attempt until it returns
nullor a correct password, so it may prompt the user anew each time.