(Android™) Extract Embedded Files from PDF

Demonstrates how to get information about the embedded files (if any) contained within a PDF, and shows how to extract each file.

Note: This example requires Chilkat v9.5.0.95 or greater.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkPdf pdf = new CkPdf();

    boolean success = pdf.LoadFile("qa_data/pdf/embedded_files/my_embedded_files_test.pdf");
    if (success == false) {
        Log.i(TAG, pdf.lastErrorText());
        return;
        }

    // Note: The embedded file functionality was added in Chilkat v9.5.0.95

    // How many embedded files exist within the opened PDF?
    int numFiles = pdf.get_NumEmbeddedFiles();
    Log.i(TAG, "Number of embedded files: " + String.valueOf(numFiles));

    CkJsonObject json = new CkJsonObject();
    json.put_EmitCompact(false);

    CkBinData bd = new CkBinData();

    // Get information about each file, and extract each to the filesystem.
    int i = 0;
    while (i < numFiles) {

        success = pdf.GetEmbeddedFileInfo(i,json);
        if (success == false) {
            Log.i(TAG, pdf.lastErrorText());
            return;
            }

        Log.i(TAG, json.emit());

        // Get the filename from the JSON.
        String filename = "someFile.dat";

        // The filename SHOULD always be present..
        if (json.HasMember("filename") == true) {
            filename = json.stringOf("filename");
            }

        // Get the file data.
        success = pdf.GetEmbeddedFileBd(i,bd);
        if (success == false) {
            Log.i(TAG, pdf.lastErrorText());
            return;
            }

        // Save the contents of the bd to the filename (in the current working directory) in the filesystem.
        success = bd.WriteFile(filename);
        if (success == false) {
            Log.i(TAG, "Failed to write output file.");
            }

        i = i + 1;
        }

    // Sample output for the above code:

    // Number of embedded files: 3
    // {
    //   "filename": "employees.json",
    //   "desc": "JSON",
    //   "subType": "application/json",
    //   "size": 159,
    //   "creationDate": "D:20230715170506-05'00'",
    //   "modDate": "D:20160207153838-05'00'"
    // }
    // 
    // {
    //   "filename": "rsaPubKey.pem",
    //   "desc": "RSA Public Key PEM",
    //   "size": 451,
    //   "creationDate": "D:20230715170546-05'00'",
    //   "modDate": "D:20150724133153-05'00'"
    // }
    // 
    // {
    //   "filename": "starfish.jpg",
    //   "desc": "Starfish JPG",
    //   "subType": "image/jpeg",
    //   "size": 6229,
    //   "creationDate": "D:20230715170356-05'00'",
    //   "modDate": "D:20080529103055-05'00'"
    // }

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}