C#

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

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Example code to unzip Files Matching a Pattern (such as *.xml) C#

bool success = false;

//  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
Chilkat.Http http = new Chilkat.Http();
success = http.Download("http://www.example-code.com/data/test.zip","qa_test/test.zip");
if (success != true) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Chilkat.Zip zip = new Chilkat.Zip();

success = zip.OpenZip("qa_test/test.zip");
if (success != true) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

//  Show what's in the .zip by getting the directory as XML.
string zipContentsXml = zip.GetDirectoryAsXML();
if (zip.LastMethodSuccess != true) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

Debug.WriteLine(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".
int count = zip.UnzipMatching("qa_output","*.xml",true);
if (count < 0) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

Debug.WriteLine("unzipped " + Convert.ToString(count) + " matching file(s).");

//  ------------------------------------------------------------------------
//  If we wish to unzip only files under the "123" directory, we can do this:
count = zip.UnzipMatching("qa_output2","*/123/*",true);
if (count < 0) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

Debug.WriteLine("unzipped " + Convert.ToString(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 = zip.UnzipMatching("qa_output3","test/hamlet.xml",true);
if (count < 0) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

Debug.WriteLine("unzipped " + Convert.ToString(count) + " matching file(s).");

//  ------------------------------------------------------------------------
//  If we want to unzip any file named "hamlet.xml" found in any sub-directory...
count = zip.UnzipMatching("qa_output4","*/hamlet.xml",true);
if (count < 0) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

Debug.WriteLine("unzipped " + Convert.ToString(count) + " matching file(s).");