React Native

Unzip Files Matching a Pattern (such as *.xml)

See more Zip Examples

Example code to unzip Files Matching a Pattern (such as *.xml) React Native

import { Http, Zip } from '@chilkat/react-native'

async function chilkatExample() {
  // This example works with the .zip located at http://www.example-code.com/data/test.zip

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

  // First, let's download the .zip
  const http = new Http();
  try {
    await http.downloadAsync('http://www.example-code.com/data/test.zip', 'qa_test/test.zip');
  } catch {
    console.log(http.lastErrorText);
    return;
  }

  const zip = new Zip();

  try {
    await zip.openZipAsync('qa_test/test.zip');
  } catch {
    console.log(zip.lastErrorText);
    return;
  }

  // Show what's in the .zip by getting the directory as XML.
  let zipContentsXml: string;
  try {
    zipContentsXml = zip.getDirectoryAsXML();
  } catch {
    console.log(zip.lastErrorText);
    return;
  }

  console.log(zipContentsXml);

  // In this case, the contents of our .zip look like this:
  // <?xml version="1.0" encoding="utf-8" ?>
  // <zip_contents>
  //     <dir name="test">
  //         <dir name="abc">
  //             <dir name="123">
  //                 <file>ecc_public.pem</file>
  //                 <file>starfish.jpg</file>
  //             </dir>
  //             <file>comodo-certificates.pem</file>
  //             <file>pigs.xml</file>
  //         </dir>
  //         <file>COMODORSACertificationAuthority.crt</file>
  //         <file>hamlet.xml</file>
  //     </dir>
  // </zip_contents>

  // ------------------------------------------------------------------------
  // If we wish to unzip only .xml files, use "*.xml" for the pattern\
  // Unzip to the "qa_output" directory relative to our current working directory.
  // (You may unzip to an absolute path by passing an absolute path, such as "/someDir" or
  // "C:/someDir", etc.)
  // This will unzip only the .xml files.  The relative directory structure within
  // the .zip will be created in the local filesystem under the unzip directory
  // path passed in the first argument, which in this case is "qa_output".
  let count = await zip.unzipMatchingAsync('qa_output', '*.xml', true);
  if (count < 0) {
    console.log(zip.lastErrorText);
    return;
  }

  console.log(`unzipped ${count} matching file(s).`);

  // ------------------------------------------------------------------------
  // If we wish to unzip only files under the "123" directory, we can do this:
  count = await zip.unzipMatchingAsync('qa_output2', '*/123/*', true);
  if (count < 0) {
    console.log(zip.lastErrorText);
    return;
  }

  console.log(`unzipped ${count} matching file(s).`);

  // ------------------------------------------------------------------------
  // If no asterisk character is used, then the match must be exact.
  // For example, to unzip "test/hamlet.xml" we must pass the exact path
  // as it is in the .zip.  We cannot just pass "hamlet.xml".
  count = await zip.unzipMatchingAsync('qa_output3', 'test/hamlet.xml', true);
  if (count < 0) {
    console.log(zip.lastErrorText);
    return;
  }

  console.log(`unzipped ${count} matching file(s).`);

  // ------------------------------------------------------------------------
  // If we want to unzip any file named "hamlet.xml" found in any sub-directory...
  count = await zip.unzipMatchingAsync('qa_output4', '*/hamlet.xml', true);
  if (count < 0) {
    console.log(zip.lastErrorText);
    return;
  }

  console.log(`unzipped ${count} matching file(s).`);
}