Dart Requires Chilkat v11.0.0+

Replace/Update a FIle in a .zip

See more Zip Examples

Demonstrates how to replace/update a file from a .zip. Note: This requires the entire .zip to be rewritten. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This requires the Chilkat Zip API to have been previously unlocked.
  // See Unlock Chilkat Zip for sample code.

  // First prepare a .zip and write it..
  final zip = CkZip();

  zip.newZip('qa_output/abc.zip');

  // Add some files..
  final charset = 'utf-8';
  zip.addString('a.txt', 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa', charset);
  zip.addString('b.txt', 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb', charset);
  zip.addString('c.txt', 'cccccccccccccccccccccccccccccccccccc', charset);

  // Write to qa_output/abc.zip
  // This .zip contains three files: a.txt, b.txt, and c.txt
  zip.writeZipAndClose();

  // -------------------------------------------------------------------
  // Open abc.zip, replace the content of the "b.txt" entry with something else, and re-write.
  final zip2 = CkZip();
  zip2.openZip('qa_output/abc.zip');

  final entry = CkZipEntry();
  if (zip2.entryOf('b.txt', entry)) {
    entry.replaceString('This is the new content.  bbbbbbbbbbbbbbbbbbbbbb', 'utf-8');
  }

  // Write the modified .zip back to "abc.zip"
  zip2.writeZipAndClose();

  print('success.');
}