C++ Requires Chilkat v11.7.0+

Replace the Value After a Label in a PDF (Re-issue an Invoice)

See more PDF Text Replacement Examples

Demonstrates replacing the values that follow labels such as "Invoice Number:" on a PDF that has no placeholders -- an ordinary invoice. Each entry of the "labels" array names a label as it appears on the page and the new value; the value replaces the rest of the label's line. Label matching ignores case, extra spaces and a trailing colon. The replaced text is read back with ExtractText to confirm it. 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 invoice_labels.pdf

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

    //  The invoice has lines such as "Invoice Number:   INV-2026-0412" and "Total Due:  $1,234.53".
    //  Each label's new value replaces whatever follows the label on its line.
    CkJsonObject json;
    json.UpdateString("labels[0].label","Invoice Number:");
    json.UpdateString("labels[0].value","INV-2026-0500");
    json.UpdateString("labels[1].label","Invoice Date:");
    json.UpdateString("labels[1].value","April 2, 2026");
    json.UpdateString("labels[2].label","customer");
    json.UpdateString("labels[2].value","Contoso Ltd");
    json.UpdateString("labels[3].label","Total Due:");
    json.UpdateString("labels[3].value","$1,999.99");

    CkJsonObject jsonOut;
    success = pdf.TextReplace("apply",json,jsonOut);
    if (success == false) {
        std::cout << "Not applied: " << jsonOut.emit() << "\r\n";
        if (success == false) {
            std::cout << pdf.lastErrorText() << "\r\n";
            return;
        }

    }

    int i = 0;
    int count_i = jsonOut.SizeOfArray("replacements");
    while (i < count_i) {
        jsonOut.put_I(i);
        std::cout << "Replaced the value of \"" << jsonOut.stringOf("replacements[i].label") << "\" on page " << jsonOut.stringOf("replacements[i].pages") << "\r\n";
        i = i + 1;
    }

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

    //  Read the new values back with ExtractText's label option.
    CkJsonObject jsonRead;
    CkJsonObject jsonText;
    jsonRead.UpdateString("label","Total Due");
    jsonRead.UpdateString("labelValue","right");
    success = pdf.ExtractText("text",jsonRead,jsonText);
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Total Due is now: " << jsonText.stringOf("text") << "\r\n";

    //  Sample output:

    //  Replaced the value of "Invoice Number:" on page 1
    //  Replaced the value of "Invoice Date:" on page 1
    //  Replaced the value of "customer" on page 1
    //  Replaced the value of "Total Due:" on page 1
    //  Total Due is now: $1,999.99
    }