Delphi DLL Requires Chilkat v11.7.0+

Extract Text from a PDF that Forbids Copying

See more PDF Text Extraction Examples

Demonstrates a PDF that opens without a password but whose permissions do not allow copying text. The "text", "markdown", "search" and "tables" operations fail with that reason; "assess" always works. Loading the PDF with the OwnerPassword property set grants owner rights, and extraction works. Delphi DLL

var
success: Boolean;
pdf: HCkPdf;
json: HCkJsonObject;
jsonOut: HCkJsonObject;

begin
success := False;

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  The PDF used in this example (owner password: owner-secret; copying not permitted) is available at no_copy_permission.pdf

pdf := CkPdf_Create();
json := CkJsonObject_Create();
jsonOut := CkJsonObject_Create();

//  The PDF opens without a password.
success := CkPdf_LoadFile(pdf,'qa_data/pdf/no_copy_permission.pdf');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;

//  Extracting text is refused, because the PDF's permissions do not allow copying.
success := CkPdf_ExtractText(pdf,'text',json,jsonOut);
if (success = False) then
  begin
    Memo1.Lines.Add('Extraction refused: ' + CkPdf__lastErrorText(pdf));
  end;

//  "assess" reports only counts and ratings, never text, so it is always allowed.
success := CkPdf_ExtractText(pdf,'assess',json,jsonOut);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;
Memo1.Lines.Add('rating: ' + CkJsonObject__stringOf(jsonOut,'quality.rating'));

//  Load with the owner password to get owner rights, which include copying.
CkPdf_putOwnerPassword(pdf,'owner-secret');
success := CkPdf_LoadFile(pdf,'qa_data/pdf/no_copy_permission.pdf');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;

success := CkPdf_ExtractText(pdf,'text',json,jsonOut);
if (success = False) then
  begin
    Memo1.Lines.Add(CkPdf__lastErrorText(pdf));
    Exit;
  end;
Memo1.Lines.Add(CkJsonObject__stringOf(jsonOut,'text'));

//  Sample output:

//  Extraction refused: ChilkatLog:
//    ExtractText:
//      ...
//        The PDF's permissions do not allow copying or extracting text (load it with the owner password to extract).
//      ...
//  rating: good
//  Visitor Leaflet
//  
//  Welcome to the harbor lighthouse. The tower is open on weekends from July to September.
//  
//  Please keep to the marked paths and do not climb on the breakwater.
//  
//  The lantern room is closed in high winds.

CkPdf_Dispose(pdf);
CkJsonObject_Dispose(json);
CkJsonObject_Dispose(jsonOut);