Xbase++ 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. Xbase++

LOCAL nSuccess
LOCAL oPdf
LOCAL oJson
LOCAL oJsonOut
LOCAL i
LOCAL nCount_i
LOCAL oJsonRead
LOCAL oJsonText

nSuccess := 0

//  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

oPdf := CreateObject("Chilkat.Pdf")
nSuccess := oPdf:LoadFile("qa_data/pdf/invoice_labels.pdf")
IF (nSuccess == 0)
    ? oPdf:LastErrorText
    oPdf:destroy()
    RETURN
ENDIF

//  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.
oJson := CreateObject("Chilkat.JsonObject")
oJson:UpdateString("labels[0].label", "Invoice Number:")
oJson:UpdateString("labels[0].value", "INV-2026-0500")
oJson:UpdateString("labels[1].label", "Invoice Date:")
oJson:UpdateString("labels[1].value", "April 2, 2026")
oJson:UpdateString("labels[2].label", "customer")
oJson:UpdateString("labels[2].value", "Contoso Ltd")
oJson:UpdateString("labels[3].label", "Total Due:")
oJson:UpdateString("labels[3].value", "$1,999.99")

oJsonOut := CreateObject("Chilkat.JsonObject")
nSuccess := oPdf:TextReplace("apply", oJson, oJsonOut)
IF (nSuccess == 0)
    ? "Not applied: " + oJsonOut:Emit()
    IF (nSuccess == 0)
        ? oPdf:LastErrorText
        oPdf:destroy()
        oJson:destroy()
        oJsonOut:destroy()
        RETURN
    ENDIF

ENDIF

i := 0
nCount_i := oJsonOut:SizeOfArray("replacements")
DO WHILE i < nCount_i
    oJsonOut:I := i
    ? 'Replaced the value of "' + oJsonOut:StringOf("replacements[i].label") + '" on page ' + oJsonOut:StringOf("replacements[i].pages")
    i := i + 1
ENDDO

nSuccess := oPdf:WriteFile("qa_output/invoice_reissued.pdf")
IF (nSuccess == 0)
    ? oPdf:LastErrorText
    oPdf:destroy()
    oJson:destroy()
    oJsonOut:destroy()
    RETURN
ENDIF

//  Read the new values back with ExtractText's label option.
oJsonRead := CreateObject("Chilkat.JsonObject")
oJsonText := CreateObject("Chilkat.JsonObject")
oJsonRead:UpdateString("label", "Total Due")
oJsonRead:UpdateString("labelValue", "right")
nSuccess := oPdf:ExtractText("text", oJsonRead, oJsonText)
IF (nSuccess == 0)
    ? oPdf:LastErrorText
    oPdf:destroy()
    oJson:destroy()
    oJsonOut:destroy()
    oJsonRead:destroy()
    oJsonText:destroy()
    RETURN
ENDIF

? "Total Due is now: " + oJsonText:StringOf("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

oPdf:destroy()
oJson:destroy()
oJsonOut:destroy()
oJsonRead:destroy()
oJsonText:destroy()