Dart

GZip Create / Extract .gz File

See more Gzip Examples

Demonstrates how to compress a file to create a .gz (GZip) file.

Note: The .gz file format is a compressed file format. It contains a single file. The .gz file format is not an archive format (i.e. it does not contain a collection of files/directories such as with the .zip, .rar, or .tar file formats). GZip is often combined with TAR to create a .tgz (or .tar.gz).

Note: It is possible for a .gz to contain more than one file, but this is very uncommon.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  var success = false;

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

  final gzip = CkGzip();

  // File-to-file GZip:
  // Compress "hamlet.xml" to create "hamlet.xml.gz";
  success = true;
  try {
    gzip.compressFile('hamlet.xml', 'hamlet.xml.gz');
  } on ChilkatException {
    success = false;
  }
  if (!success) {
    print(gzip.lastErrorText);
    return;
  }

  // File-to-file ungzip
  // Decompress "hamlet.xml.gz" to create "hamletOut.xml";
  success = true;
  try {
    gzip.uncompressFile('hamlet.xml.gz', 'hamletOut.xml');
  } on ChilkatException {
    success = false;
  }
  if (!success) {
    print(gzip.lastErrorText);
    return;
  }

  // File-to-string ungzip
  // Decompress the contents of a .gz directly to a string variable:
  // The 2nd argument indicates the charset of the character
  // data after it is decompressed.
  final xmlStr = gzip.uncompressFileToString('hamlet.xml.gz', 'utf-8');
  if (!success) {
    print(gzip.lastErrorText);
    return;
  }

  print(xmlStr);

  // The Chilkat GZip API provides much more flexibility than shown
  // here.  See the reference documentation at 
  // http://www.chilkatsoft.com/refdoc for more information.
}