Hello dear podofo users,
I stumbled upon an issue with the deletion of annotations today:
PdfPage.cpp:409ff
> void PdfPage::DeleteAnnotation( int index )
> {
> PdfObject* pObj = this->GetAnnotationsArray( false );
> PdfObject* pItem;
> [..]
> pItem = &(pObj->GetArray()[index]);
> if( pItem->IsDictionary() )
> {
> [..]
> }
> else
> {
> this->DeleteAnnotation( pItem->GetReference() );
> }
> }
>
When calling DeleteAnnotation with an index, the requested Annotation is
stored into pItem. In my case it is not a dictionary, so DeleteAnnotation
with a Reference is called:
PdfPage.cpp:446ff
> void PdfPage::DeleteAnnotation( const PdfReference & ref )
> {
> [..]
>
while( it != pObj->GetArray().end() )
> {
> if( (*it).IsReference() && (*it).GetReference() == ref )
> {
> pObj->GetArray().erase( it );
> bFound = true;
> break;
> }
> ++it;
> }
> [..]
> delete this->GetObject()->GetOwner()->RemoveObject( ref );
> }
>
Here, the reference is removed from the array and the corresponding object
is deleted at the end.
*The problem is, the erase operation on the array destroys the reference
ref! *I can see with the debugger that Ref's object number changes after
the erase, so the subsequent RemoveObject call is in error! It either tries
to remove a non-existing object (best-case) or some other unrelated object
(worst-case), depending on what values are stored at the location now.
When checking the resulting PDF, I can see that the annotation objects are
still there, but it was removed from the page's annotation list.
I guess the fix might be quite easy:
Either pass the PdfReference by value instead of by reference, or copy it
into a local before removing it from the array, so a valid PdfReference
object can be used for subsequent removal.
I didn't have time to test this myself today, though.
Could someone confirm my findings, please?
Greetings
F.E.
p.s.: Sorry for the first, uncomplete mail, didn't know gmail sends the
mail right away when pressing CTRL+Enter
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