Unicode 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. Unicode C

#include <C_CkPdfW.h>
#include <C_CkJsonObjectW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkPdfW pdf;
    HCkJsonObjectW json;
    HCkJsonObjectW jsonOut;
    int i;
    int count_i;
    HCkJsonObjectW jsonRead;
    HCkJsonObjectW jsonText;

    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

    pdf = CkPdfW_Create();
    success = CkPdfW_LoadFile(pdf,L"qa_data/pdf/invoice_labels.pdf");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf));
        CkPdfW_Dispose(pdf);
        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.
    json = CkJsonObjectW_Create();
    CkJsonObjectW_UpdateString(json,L"labels[0].label",L"Invoice Number:");
    CkJsonObjectW_UpdateString(json,L"labels[0].value",L"INV-2026-0500");
    CkJsonObjectW_UpdateString(json,L"labels[1].label",L"Invoice Date:");
    CkJsonObjectW_UpdateString(json,L"labels[1].value",L"April 2, 2026");
    CkJsonObjectW_UpdateString(json,L"labels[2].label",L"customer");
    CkJsonObjectW_UpdateString(json,L"labels[2].value",L"Contoso Ltd");
    CkJsonObjectW_UpdateString(json,L"labels[3].label",L"Total Due:");
    CkJsonObjectW_UpdateString(json,L"labels[3].value",L"$1,999.99");

    jsonOut = CkJsonObjectW_Create();
    success = CkPdfW_TextReplace(pdf,L"apply",json,jsonOut);
    if (success == FALSE) {
        wprintf(L"Not applied: %s\n",CkJsonObjectW_emit(jsonOut));
        if (success == FALSE) {
            wprintf(L"%s\n",CkPdfW_lastErrorText(pdf));
            CkPdfW_Dispose(pdf);
            CkJsonObjectW_Dispose(json);
            CkJsonObjectW_Dispose(jsonOut);
            return;
        }

    }

    i = 0;
    count_i = CkJsonObjectW_SizeOfArray(jsonOut,L"replacements");
    while (i < count_i) {
        CkJsonObjectW_putI(jsonOut,i);
        wprintf(L"Replaced the value of \"%s\" on page %s\n",CkJsonObjectW_stringOf(jsonOut,L"replacements[i].label"),CkJsonObjectW_stringOf(jsonOut,L"replacements[i].pages"));
        i = i + 1;
    }

    success = CkPdfW_WriteFile(pdf,L"qa_output/invoice_reissued.pdf");
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf));
        CkPdfW_Dispose(pdf);
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(jsonOut);
        return;
    }

    //  Read the new values back with ExtractText's label option.
    jsonRead = CkJsonObjectW_Create();
    jsonText = CkJsonObjectW_Create();
    CkJsonObjectW_UpdateString(jsonRead,L"label",L"Total Due");
    CkJsonObjectW_UpdateString(jsonRead,L"labelValue",L"right");
    success = CkPdfW_ExtractText(pdf,L"text",jsonRead,jsonText);
    if (success == FALSE) {
        wprintf(L"%s\n",CkPdfW_lastErrorText(pdf));
        CkPdfW_Dispose(pdf);
        CkJsonObjectW_Dispose(json);
        CkJsonObjectW_Dispose(jsonOut);
        CkJsonObjectW_Dispose(jsonRead);
        CkJsonObjectW_Dispose(jsonText);
        return;
    }

    wprintf(L"Total Due is now: %s\n",CkJsonObjectW_stringOf(jsonText,L"text"));

    //  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


    CkPdfW_Dispose(pdf);
    CkJsonObjectW_Dispose(json);
    CkJsonObjectW_Dispose(jsonOut);
    CkJsonObjectW_Dispose(jsonRead);
    CkJsonObjectW_Dispose(jsonText);

    }