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

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

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#include <CkHttp.h>
#include <CkZip.h>

void ChilkatSample(void)
    {
    // 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
    CkHttp http;
    bool success = http.Download("http://www.example-code.com/data/test.zip","qa_test/test.zip");
    if (success != true) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    CkZip zip;

    success = zip.OpenZip("qa_test/test.zip");
    if (success != true) {
        std::cout << zip.lastErrorText() << "\r\n";
        return;
    }

    // Show what's in the .zip by getting the directory as XML.
    const char *zipContentsXml = zip.getDirectoryAsXML();
    if (zip.get_LastMethodSuccess() != true) {
        std::cout << zip.lastErrorText() << "\r\n";
        return;
    }

    std::cout << zipContentsXml << "\r\n";

    // 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) {
        std::cout << zip.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "unzipped " << count << " matching file(s)." << "\r\n";

    // ------------------------------------------------------------------------
    // 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) {
        std::cout << zip.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "unzipped " << count << " matching file(s)." << "\r\n";

    // ------------------------------------------------------------------------
    // 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) {
        std::cout << zip.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "unzipped " << count << " matching file(s)." << "\r\n";

    // ------------------------------------------------------------------------
    // 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) {
        std::cout << zip.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "unzipped " << count << " matching file(s)." << "\r\n";
    }