Dart Requires Chilkat v11.7.0+

Extract One Section of a PDF by its Heading

See more PDF Text Extraction Examples

Demonstrates "labelValue": "section", which returns everything from a heading up to the next heading of the same or higher level. With the "markdown" operation the section keeps its own sub-headings. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // 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 sectioned_doc.pdf

  final pdf = CkPdf();
  try {
    pdf.loadFile('qa_data/pdf/sectioned_doc.pdf');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final json = CkJsonObject();
  final jsonOut = CkJsonObject();

  // The document has the sections Introduction, Opening Hours, Terms and Conditions (with the
  // sub-sections Admission, Safety and Liability) and Contact.  Get the Terms and Conditions:
  // everything after that heading up to the next heading of the same level (Contact).  The heading
  // itself is not part of the value; labelMatches[0].label has it.
  json.updateString('label', 'Terms and Conditions');
  json.updateString('labelValue', 'section');

  try {
    pdf.extractText('markdown', json, jsonOut);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print(jsonOut.stringOf('markdown'));

  // The same with the "text" operation gives the section as plain text.
  try {
    pdf.extractText('text', json, jsonOut);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('---- as text ----');
  print(jsonOut.stringOf('text'));

  // Sample output:

  // ### Admission
  // 
  // Admission is free. Groups of more than ten should book in advance so that a volunteer can be assigned to them.
  // 
  // ### Safety
  // 
  // No more than eight people may be on the stair at one time. Children under twelve must be accompanied by an adult, and the lantern room is closed in high winds.
  // 
  // ### Liability
  // 
  // Visitors climb the tower at their own risk. The society carries public liability insurance but accepts no responsibility for personal property.
  // ---- as text ----
  // Admission
  // 
  // Admission is free. Groups of more than ten should book in advance so that a volunteer can be assigned to them.
  // 
  // Safety
  // 
  // No more than eight people may be on the stair at one time. Children under twelve must be accompanied by an adult, and the lantern room is closed in high winds.
  // 
  // Liability
  // 
  // Visitors climb the tower at their own risk. The society carries public liability insurance but accepts no responsibility for personal property.
}