C++ Requires Chilkat v11.7.0+

Page Numbers, Dates and the File Name in a PDF Watermark

See more PDF Watermark Examples

Demonstrates the placeholders a text watermark understands, each replaced per page as the watermark is added: {page} is the page number, {pages} the page count, {date:FORMAT} the current local date and time, and {filename} the name of the file that was loaded. Two braces give a literal brace. pageNumber.start sets what {page} is on the first page, which is how a numbering that ignores a cover is produced, and pageNumber.style formats both {page} and {pages} as decimal, romanUpper, romanLower, letterUpper or letterLower. 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 four_pages.pdf

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

    CkJsonObject json;
    json.UpdateString("type","text");
    json.UpdateString("text","Page {page} of {pages}  -  printed {date:yyyy-MM-dd HH:mm}  -  {filename}");
    json.UpdateString("id","pagefoot");
    json.UpdateString("position.align","bottom");
    json.UpdateNumber("position.margin","24");
    json.UpdateNumber("font.size","9");
    json.UpdateString("color","#505050");

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

    std::cout << "footer pages: " << jsonOut.stringOf("pages") << "\r\n";

    //  Roman numerals that start at i on page 2, so that a cover page is not numbered.
    CkPdf pdf2;
    success = pdf2.LoadFile("qa_data/pdf/four_pages.pdf");
    if (success == false) {
        std::cout << pdf2.lastErrorText() << "\r\n";
        return;
    }

    CkJsonObject json2;
    json2.UpdateString("type","text");
    json2.UpdateString("text","- {page} -");
    json2.UpdateString("id","roman");
    json2.UpdateString("pages","2-");
    json2.UpdateInt("pageNumber.start",1);
    json2.UpdateString("pageNumber.style","romanLower");
    json2.UpdateString("position.align","bottom");
    json2.UpdateNumber("font.size","10");
    success = pdf2.Watermark("add",json2,jsonOut);
    if (success == false) {
        std::cout << pdf2.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "roman pages: " << jsonOut.stringOf("pages") << "\r\n";

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

    //  Sample output:

    //  footer pages: 1-4
    //  roman pages: 2-4
    }