Monkeybread Software - DynaPDF Manual

DynaPDF Manual - Page 85

Incremental Updates

Page 85 of 874

If no changes were made, CloseFile() creates just a copy of the original file. It is usually best to

maintain a variable like Altered to determine whether something was changed.

Damaged PDF files

PDF files contain sometimes damages which are normally automatically repaired by DynaPDF.

However, since the existing file structure cannot be changed by an incremental update, nothing

can be repaired in this case.

This circumstance can lead to issues since not every PDF file that can be read by DynaPDF is

readable by other PDF libraries or PDF viewers.

Since DynaPDF does not restrict the processing of damaged PDF files, you can decide by

yourself whether incremental updates should be enabled for damaged PDF files ot not.

To check whether the file was opened in repair in mode call GetInRepairMode() after

OpenImportFile() or OpenImportBuffer().

Possible errors

As described at CreateSignatureField(), a form can be locked after signing with a Javascript

action. Since DynaPDF does not contain a Javascript interpreter, such actions are not considered

yet.

Signing a locked form is not allowed and causes error messages when opening such a file with

Adobes Acrobat or Reader.