C++ Requires Chilkat v11.7.0+

Replace PDF Text on Selected Pages Only

See more PDF Text Replacement Examples

Demonstrates the "pages" option, which limits the search for placeholders and labels to the given pages: "all" (the default), "first", "last", "odd", "even", or a list such as "1,3,5-9". The two-page order confirmation carries the same "Status:" label on both pages; the status is changed on page 2 only, then on both pages. 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 order_confirmation.pdf

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

    CkJsonObject json;
    CkJsonObject jsonOut;

    //  Both pages have "Status:   Pending".  With pages "2", only page 2 is searched.
    json.UpdateString("pages","2");
    json.UpdateString("labels[0].label","Status:");
    json.UpdateString("labels[0].value","Shipped");
    success = pdf.TextReplace("check",json,jsonOut);
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "pages 2: found on page(s) " << jsonOut.stringOf("replacements[0].pages") << "\r\n";

    //  With every page searched, the default occurrence ("first") still replaces one -- the first in reading order.
    json.UpdateString("pages","all");
    success = pdf.TextReplace("check",json,jsonOut);
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "pages all, first occurrence: found on page(s) " << jsonOut.stringOf("replacements[0].pages") << "\r\n";

    //  Every occurrence on every page.
    json.UpdateString("labels[0].occurrence","all");
    success = pdf.TextReplace("apply",json,jsonOut);
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "pages all, every occurrence: " << jsonOut.IntOf("replacements[0].count") << " replaced on page(s) " << jsonOut.stringOf("replacements[0].pages") << "\r\n";

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

    //  Sample output:

    //  pages 2: found on page(s) 2
    //  pages all, first occurrence: found on page(s) 1
    //  pages all, every occurrence: 2 replaced on page(s) 1,2
    }