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Sample Java code for using PDFTron SDK to traverse the page display list using ElementReader. Learn more about our Java PDF Library and PDF Parsing & Content Extraction Library.
Get Started Samples DownloadTo run this sample, get started with a free trial of Apryse SDK.
//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2019 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------
package com.pdftron.android.pdfnetsdksamples.samples;
import com.pdftron.android.pdfnetsdksamples.OutputListener;
import com.pdftron.android.pdfnetsdksamples.PDFNetSample;
import com.pdftron.android.pdfnetsdksamples.R;
import com.pdftron.android.pdfnetsdksamples.util.Utils;
import com.pdftron.common.PDFNetException;
import com.pdftron.pdf.Element;
import com.pdftron.pdf.ElementReader;
import com.pdftron.pdf.PDFDoc;
import com.pdftron.pdf.PageIterator;
import com.pdftron.pdf.PathData;
import java.util.ArrayList;
public class ElementReaderTest extends PDFNetSample {
private static OutputListener mOutputListener;
private static ArrayList<String> mFileList = new ArrayList<>();
public ElementReaderTest() {
setTitle(R.string.sample_elementreader_title);
setDescription(R.string.sample_elementreader_description);
}
@Override
public void run(OutputListener outputListener) {
super.run(outputListener);
mOutputListener = outputListener;
mFileList.clear();
printHeader(outputListener);
try // Extract text data from all pages in the document
{
mOutputListener.println("-------------------------------------------------");
mOutputListener.println("Sample 1 - Extract text data from all pages in the document.");
mOutputListener.println("Opening the input pdf...");
PDFDoc doc = new PDFDoc(Utils.getAssetTempFile(INPUT_PATH + "newsletter.pdf").getAbsolutePath());
doc.initSecurityHandler();
int pgnum = doc.getPageCount();
PageIterator itr;
ElementReader page_reader = new ElementReader();
for (itr = doc.getPageIterator(); itr.hasNext(); ) // Read every page
{
page_reader.begin(itr.next());
ProcessElements(page_reader);
page_reader.end();
}
//Close the open document to free up document memory sooner.
doc.close();
mOutputListener.println("Done.");
} catch (Exception e) {
mOutputListener.printError(e.getStackTrace());
}
for (String file : mFileList) {
addToFileList(file);
}
printFooter(outputListener);
}
static void ProcessElements(ElementReader reader) throws PDFNetException {
for (Element element = reader.next(); element != null; element = reader.next()) // Read page contents
{
switch (element.getType())
{
case Element.e_path: // Process path data...
{
PathData data = element.getPathData();
byte[] operators = data.getOperators();
double[] points = data.getPoints();
}
break;
case Element.e_text: // Process text strings...
{
String data = element.getTextString();
mOutputListener.println(data);
}
break;
case Element.e_form: // Process form XObjects
{
reader.formBegin();
ProcessElements(reader);
reader.end();
}
break;
}
}
}
}