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

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

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#import <CkoHttp.h>
#import <CkoZip.h>
#import <NSString.h>

// 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
CkoHttp *http = [[CkoHttp alloc] init];
BOOL success = [http Download: @"http://www.example-code.com/data/test.zip" saveToPath: @"qa_test/test.zip"];
if (success != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

CkoZip *zip = [[CkoZip alloc] init];

success = [zip OpenZip: @"qa_test/test.zip"];
if (success != YES) {
    NSLog(@"%@",zip.LastErrorText);
    return;
}

// Show what's in the .zip by getting the directory as XML.
NSString *zipContentsXml = [zip GetDirectoryAsXML];
if (zip.LastMethodSuccess != YES) {
    NSLog(@"%@",zip.LastErrorText);
    return;
}

NSLog(@"%@",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" pattern: @"*.xml" verbose: YES] intValue];
if (count < 0) {
    NSLog(@"%@",zip.LastErrorText);
    return;
}

NSLog(@"%@%d%@",@"unzipped ",count,@" matching file(s).");

// ------------------------------------------------------------------------
// If we wish to unzip only files under the "123" directory, we can do this:
count = [[zip UnzipMatching: @"qa_output2" pattern: @"*/123/*" verbose: YES] intValue];
if (count < 0) {
    NSLog(@"%@",zip.LastErrorText);
    return;
}

NSLog(@"%@%d%@",@"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 = [[zip UnzipMatching: @"qa_output3" pattern: @"test/hamlet.xml" verbose: YES] intValue];
if (count < 0) {
    NSLog(@"%@",zip.LastErrorText);
    return;
}

NSLog(@"%@%d%@",@"unzipped ",count,@" matching file(s).");

// ------------------------------------------------------------------------
// If we want to unzip any file named "hamlet.xml" found in any sub-directory...
count = [[zip UnzipMatching: @"qa_output4" pattern: @"*/hamlet.xml" verbose: YES] intValue];
if (count < 0) {
    NSLog(@"%@",zip.LastErrorText);
    return;
}

NSLog(@"%@%d%@",@"unzipped ",count,@" matching file(s).");