Python 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. Chilkat2-Python

import sys
import chilkat2

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 = chilkat2.Pdf()
success = pdf.LoadFile("qa_data/pdf/invoice_labels.pdf")
if (success == False):
    print(pdf.LastErrorText)
    sys.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 = chilkat2.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 = chilkat2.JsonObject()
success = pdf.TextReplace("apply",json,jsonOut)
if (success == False):
    print("Not applied: " + jsonOut.Emit())
    if (success == False):
        print(pdf.LastErrorText)
        sys.exit()

i = 0
count_i = jsonOut.SizeOfArray("replacements")
while i < count_i :
    jsonOut.I = i
    print("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 == False):
    print(pdf.LastErrorText)
    sys.exit()

# Read the new values back with ExtractText's label option.
jsonRead = chilkat2.JsonObject()
jsonText = chilkat2.JsonObject()
jsonRead.UpdateString("label","Total Due")
jsonRead.UpdateString("labelValue","right")
success = pdf.ExtractText("text",jsonRead,jsonText)
if (success == False):
    print(pdf.LastErrorText)
    sys.exit()

print("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