C++ Requires Chilkat v11.7.0+

Add a CONFIDENTIAL Watermark to Every Page of a PDF

See more PDF Watermark Examples

Demonstrates the simplest watermark: a line of text across every page. "rotation" set to diagonal runs the text from the bottom-left corner to the top-right, computed for each page size, and "scale" with fit page sizes it to fill 80 percent of the page. The watermark is stored as a marked artifact by default, which means viewers show it, text extraction leaves it out, and it can be found and removed again later. Nothing is written until WriteFile is called. C++

#include <CkPdf.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    bool 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 is available at long_report.pdf

    CkPdf pdf;
    success = pdf.LoadFile("qa_data/pdf/long_report.pdf");
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    CkJsonObject json;
    json.UpdateString("type","text");
    json.UpdateString("text","CONFIDENTIAL");

    //  An id of your own choosing, so that the watermark can be found and removed later.  One is
    //  generated when you do not give one.
    json.UpdateString("id","confidential");

    json.UpdateString("color","#C00000");
    json.UpdateNumber("opacity","0.25");
    json.UpdateString("rotation","diagonal");
    json.UpdateString("scale.fit","page");
    json.UpdateNumber("scale.fitPercent","80");

    CkJsonObject jsonOut;
    success = pdf.Watermark("add",json,jsonOut);
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    //  The id, and the pages it was stamped on.  "pages" defaults to all.
    std::cout << "id: " << jsonOut.stringOf("id") << "\r\n";
    std::cout << "pages: " << jsonOut.stringOf("pages") << "\r\n";

    success = pdf.WriteFile("qa_output/report_confidential.pdf");
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    //  Sample output:

    //  id: confidential
    //  pages: 1-3
    }