PowerShell 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. PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$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 = New-Object Chilkat.Pdf
$success = $pdf.LoadFile("qa_data/pdf/invoice_labels.pdf")
if ($success -eq $false) {
    $($pdf.LastErrorText)
    exit
}

#  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 = New-Object Chilkat.JsonObject
$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")

$jsonOut = New-Object Chilkat.JsonObject
$success = $pdf.TextReplace("apply",$json,$jsonOut)
if ($success -eq $false) {
    $("Not applied: " + $jsonOut.Emit())
    if ($success -eq $false) {
        $($pdf.LastErrorText)
        exit
    }

}

$i = 0
$count_i = $jsonOut.SizeOfArray("replacements")
while ($i -lt $count_i) {
    $jsonOut.I = $i
    $("Replaced the value of `"" + $jsonOut.StringOf("replacements[i].label") + "`" on page " + $jsonOut.StringOf("replacements[i].pages"))
    $i = $i + 1
}

$success = $pdf.WriteFile("qa_output/invoice_reissued.pdf")
if ($success -eq $false) {
    $($pdf.LastErrorText)
    exit
}

#  Read the new values back with ExtractText's label option.
$jsonRead = New-Object Chilkat.JsonObject
$jsonText = New-Object Chilkat.JsonObject
$jsonRead.UpdateString("label","Total Due")
$jsonRead.UpdateString("labelValue","right")
$success = $pdf.ExtractText("text",$jsonRead,$jsonText)
if ($success -eq $false) {
    $($pdf.LastErrorText)
    exit
}

$("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