C 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. C

#include <C_CkPdf.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkPdf pdf;
    HCkJsonObject json;
    HCkJsonObject jsonOut;

    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) {
        printf("%s\n",CkPdf_lastErrorText(pdf));
        CkPdf_Dispose(pdf);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        return;
    }

    //  Extracting text is refused, because the PDF's permissions do not allow copying.
    success = CkPdf_ExtractText(pdf,"text",json,jsonOut);
    if (success == FALSE) {
        printf("Extraction refused: %s\n",CkPdf_lastErrorText(pdf));
    }

    //  "assess" reports only counts and ratings, never text, so it is always allowed.
    success = CkPdf_ExtractText(pdf,"assess",json,jsonOut);
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf));
        CkPdf_Dispose(pdf);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        return;
    }

    printf("rating: %s\n",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) {
        printf("%s\n",CkPdf_lastErrorText(pdf));
        CkPdf_Dispose(pdf);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        return;
    }

    success = CkPdf_ExtractText(pdf,"text",json,jsonOut);
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf));
        CkPdf_Dispose(pdf);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        return;
    }

    printf("%s\n",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);

    }