Visual FoxPro 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. Visual FoxPro

LOCAL lnSuccess
LOCAL loPdf
LOCAL loJson
LOCAL loJsonOut

lnSuccess = 0

*  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

loPdf = CreateObject('Chilkat.Pdf')
loJson = CreateObject('Chilkat.JsonObject')
loJsonOut = CreateObject('Chilkat.JsonObject')

*  The PDF opens without a password.
lnSuccess = loPdf.LoadFile("qa_data/pdf/no_copy_permission.pdf")
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loJsonOut
    CANCEL
ENDIF

*  Extracting text is refused, because the PDF's permissions do not allow copying.
lnSuccess = loPdf.ExtractText("text",loJson,loJsonOut)
IF (lnSuccess = 0) THEN
    ? "Extraction refused: " + loPdf.LastErrorText
ENDIF

*  "assess" reports only counts and ratings, never text, so it is always allowed.
lnSuccess = loPdf.ExtractText("assess",loJson,loJsonOut)
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loJsonOut
    CANCEL
ENDIF

? "rating: " + loJsonOut.StringOf("quality.rating")

*  Load with the owner password to get owner rights, which include copying.
loPdf.OwnerPassword = "owner-secret"
lnSuccess = loPdf.LoadFile("qa_data/pdf/no_copy_permission.pdf")
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loJsonOut
    CANCEL
ENDIF

lnSuccess = loPdf.ExtractText("text",loJson,loJsonOut)
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loJsonOut
    CANCEL
ENDIF

? loJsonOut.StringOf("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.

RELEASE loPdf
RELEASE loJson
RELEASE loJsonOut