Dart Requires Chilkat v11.0.0+

Extract a Single ZIP Entry While Preserving Its Stored Path

See more Zip Examples

This example demonstrates how to use the ZipEntry.Extract method to extract a single entry from a ZIP archive.

The example first creates a ZIP archive containing a text file. It then re-opens the ZIP, finds the entry, and extracts it to a base directory.

The Extract method uses the relative path stored within the ZIP entry. Any required subdirectories are created automatically beneath the specified base directory.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  var success = false;

  // ------------------------------------------------------------
  // First create a sample ZIP archive containing a small text file.

  final zip = CkZip();

  try {
    zip.newZip('c:/temp/sampleText.zip');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Add a small text file from memory.
  try {
    zip.addString('myApp/docs/hello.txt', 'Hello from a ZIP entry!', 'utf-8');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Write the ZIP archive to disk and close it.
  try {
    zip.writeZipAndClose();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // ------------------------------------------------------------
  // Now open the ZIP archive we just created.

  final zip2 = CkZip();

  try {
    zip2.openZip('c:/temp/sampleText.zip');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Find the entry by its stored ZIP path.
  final entry = CkZipEntry();

  success = zip2.entryOf('myApp/docs/hello.txt', entry);

  if (!success) {
    print('Entry not found.');
    return;
  }

  // Extract this single entry to the base directory:
  // 
  //     c:/temp/extracted
  // 
  // Because the entry's stored path is:
  // 
  //     myApp/docs/hello.txt
  // 
  // the file will be extracted to:
  // 
  //     qa_output/extracted/myApp/docs/hello.txt
  // 
  // The required subdirectories are created automatically.
  try {
    entry.extract('c:/temp/extracted');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  zip2.closeZip();

  print('Entry extracted successfully.');
}