Dart

Iterate Through ZIP Entries Using EntryAt and ZipEntry.GetNext

See more Zip Examples

This example demonstrates how to iterate through all entries in a ZIP archive using:

• Zip.EntryAt to obtain the first entry
• ZipEntry.GetNext to advance through the remaining entries

The example prints each ZIP entry's stored filename and whether the entry is a file or directory.

This approach is useful when sequentially processing ZIP entries without repeatedly calling EntryAt by index.

Suppose the ZIP archive contains:

docs/
docs/readme.txt
images/logo.png
hello.txt

The example iterates through each entry in the order stored within the ZIP archive.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  var success = false;

  final zip = CkZip();

  // Open an existing ZIP archive.
  success = true;
  try {
    zip.openZip('c:/temp/example.zip');
  } on ChilkatException {
    success = false;
  }
  if (!success) {
    print(zip.lastErrorText);
    return;
  }

  // A ZIP archive may contain zero entries.
  if (zip.numEntries == 0) {

    print('The ZIP archive is empty.');

    zip.closeZip();
    return;
  }

  // ------------------------------------------------------------
  // Get the first ZIP entry.
  // 
  // EntryAt(0,entry) initializes the ZipEntry object so that
  // it represents the first entry in the ZIP archive.
  // 
  final entry = CkZipEntry();

  success = true;
  try {
    zip.entryAt(0, entry);
  } on ChilkatException {
    success = false;
  }
  if (!success) {
    print(zip.lastErrorText);
    return;
  }

  // ------------------------------------------------------------
  // Iterate through all ZIP entries.
  // 
  // GetNext updates the same ZipEntry object so that it
  // represents the next entry in the ZIP archive.
  // 
  while (success) {

    if (entry.isDirectory) {

      print('[Directory] ${entry.fileName}');
    } else {

      print('[File] ${entry.fileName}');
    }

    // Advance to the next entry.
    success = true;
    try {
      entry.getNext();
    } on ChilkatException {
      success = false;
    }
  }

  zip.closeZip();

  print('Done.');
}