Xojo Plugin 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. Xojo Plugin

Dim success As Boolean
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

Dim pdf As New Chilkat.Pdf
success = pdf.LoadFile("qa_data/pdf/invoice_labels.pdf")
If (success = False) Then
    System.DebugLog(pdf.LastErrorText)
    Return
End If

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

Dim jsonOut As New Chilkat.JsonObject
success = pdf.TextReplace("apply",json,jsonOut)
If (success = False) Then
    System.DebugLog("Not applied: " + jsonOut.Emit())
    If (success = False) Then
        System.DebugLog(pdf.LastErrorText)
        Return
    End If

End If

Dim i As Int32
i = 0
Dim count_i As Int32
count_i = jsonOut.SizeOfArray("replacements")
While i < count_i
    jsonOut.I = i
    System.DebugLog("Replaced the value of """ + jsonOut.StringOf("replacements[i].label") + """ on page " + jsonOut.StringOf("replacements[i].pages"))
    i = i + 1
Wend

success = pdf.WriteFile("qa_output/invoice_reissued.pdf")
If (success = False) Then
    System.DebugLog(pdf.LastErrorText)
    Return
End If

//  Read the new values back with ExtractText's label option.
Dim jsonRead As New Chilkat.JsonObject
Dim jsonText As New Chilkat.JsonObject
success = jsonRead.UpdateString("label","Total Due")
success = jsonRead.UpdateString("labelValue","right")
success = pdf.ExtractText("text",jsonRead,jsonText)
If (success = False) Then
    System.DebugLog(pdf.LastErrorText)
    Return
End If

System.DebugLog("Total Due is now: " + jsonText.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