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Python PDF editor (programmatic)

Sample Python code for using PDFTron SDK to programmatically edit an existing PDF document's page display list and the graphics state attributes on existing elements. In particular, this sample strips all images from the page and changes the text color to blue. You can also build a GUI with interactive PDF editor widgets. Some of PDFTron SDK's other functions for programmatically editing PDFs include the Cos/SDF low-level API, page manipulation, and more. Learn more about our PDF Editing & Manipulation Library.

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#---------------------------------------------------------------------------------------
# Copyright (c) 2001-2019 by PDFTron Systems Inc. All Rights Reserved.
# Consult LICENSE.txt regarding license information.
#---------------------------------------------------------------------------------------

import site
site.addsitedir("../../../PDFNetC/Lib")
import sys
from PDFNetPython import *

#---------------------------------------------------------------------------------------
# The sample code shows how to edit the page display list and how to modify graphics state 
# attributes on existing Elements. In particular the sample program strips all images from 
# the page and changes text color to blue. 
#---------------------------------------------------------------------------------------

def ProcessElements(reader, writer, map):
    element = reader.Next()     # Read page contents
    while element != None:
        type = element.GetType()
        if type == Element.e_image:
            # remove all images by skipping them
            pass
        elif type == Element.e_inline_image:            
            # remove all images by skipping them
            pass
        elif type == Element.e_text:    # Process text strings...
            # Set all text to blue color.
            gs = element.GetGState()
            gs.SetFillColorSpace(ColorSpace.CreateDeviceRGB())
            cp = ColorPt(0, 0, 1)
            gs.SetFillColor(cp)
            writer.WriteElement(element)
        elif type == Element.e_form:    # Recursively process form XObjects
            o = element.GetXObject()
            map[o.GetObjNum()] = o
            writer.WriteElement(element)
            pass
        else:
            writer.WriteElement(element)
        element = reader.Next()

def main():
    PDFNet.Initialize()
    
    # Relative path to the folder containing the test files.
    input_path = "../../TestFiles/"
    output_path = "../../TestFiles/Output/"
    input_filename = "newsletter.pdf"
    output_filename = "newsletter_edited.pdf"
    
    print("-------------------------------------------------")
    
    # Open the test file
    print("Opening the input file...")
    doc = PDFDoc(input_path + input_filename)
    doc.InitSecurityHandler()
    
    writer = ElementWriter()
    reader = ElementReader()
    
    itr = doc.GetPageIterator()
    
    while itr.HasNext():
        page = itr.Current()
        reader.Begin(page)
        writer.Begin(page, ElementWriter.e_replacement, False)
        map1 = {}
        ProcessElements(reader, writer, map1)
        writer.End()
        reader.End()
		
        map2 = {}
        while (map1 or map2):
            for k in map1.keys():
                obj = map1[k]
                writer.Begin(obj)
                reader.Begin(obj, page.GetResourceDict())
                ProcessElements(reader, writer, map2)
                reader.End()
                writer.End()

                del map1[k]
            if (not map1 and map2):
                map1.update(map2)
                map2.clear()
        itr.Next()
        
    doc.Save(output_path + output_filename, SDFDoc.e_remove_unused)
    doc.Close()
    print("Done. Result saved in " + output_filename +"...")
    
if __name__ == '__main__':
    main()
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