Dart

Compress and Decompress a String

See more Compression Examples

Demonstrates how to compress and decompress a string. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example assumes the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final sb = CkStringBuilder();

  for (var i = 1; i <= 20; i++) {
    sb.append('This is the original uncompressed string.\r\n');
  }

  final compress = CkCompression();
  compress.algorithm = 'deflate';
  // Indicate that the utf-8 byte representation of the string should be compressed.
  compress.charset = 'utf-8';

  final compressedBytes = compress.compressString(sb.getAsString());

  // If the compressed data is desired in string format, then get the base64 representation of the bytes.
  compress.encodingMode = 'base64';
  final compressedBase64 = compress.compressStringENC(sb.getAsString());
  print('Compressed Bytes as Base64: $compressedBase64');

  // Now decompress...
  var decompressedString = compress.decompressString(compressedBytes);
  print('The original string after decompressing from binary compressed data:');
  print(decompressedString);

  // To decompress from Base64...
  compress.encodingMode = 'base64';
  decompressedString = compress.decompressStringENC(compressedBase64);
  print('The original string after decompressing from Base64:');
  print(decompressedString);
}