THotPDF.EmptyPasswordOpens Method

Probes whether the empty user password can decrypt a PDF stream, without committing to a load

Declaration

function EmptyPasswordOpens(Stream: TStream): boolean;

HPDFDoc

Name	Purpose
`Stream`	The positioned PDF stream to probe

True when key recovery succeeds with the empty user password, otherwise False

Runs the same key-recovery machinery as RecoverReloadKeysFromStreamRanges with an empty password, then restores the stream position and clears the temporarily recovered key state, so the probe leaves no side effects behind
Cancellation exceptions propagate; every other failure reports False
LoadFromFile with AutoDecrypt enabled applies this probe on a read-only share stream to decide whether to take the empty-password load path rather than prompting