(Objective-C) Iterate Through ZIP Entries Using EntryAt and ZipEntry.GetNext

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This example demonstrates how to iterate through all entries in a ZIP archive using:

• Zip.EntryAt to obtain the first entry
• ZipEntry.GetNext to advance through the remaining entries

The example prints each ZIP entry's stored filename and whether the entry is a file or directory.

This approach is useful when sequentially processing ZIP entries without repeatedly calling EntryAt by index.

Suppose the ZIP archive contains:

docs/
docs/readme.txt
images/logo.png
hello.txt

The example iterates through each entry in the order stored within the ZIP archive.

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#import <CkoZip.h>
#import <CkoZipEntry.h>

BOOL success = NO;

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

// Open an existing ZIP archive.
success = [zip OpenZip: @"c:/temp/example.zip"];
if (success == NO) {
    NSLog(@"%@",zip.LastErrorText);
    return;
}

// A ZIP archive may contain zero entries.
if ([zip.NumEntries intValue] == 0) {

    NSLog(@"%@",@"The ZIP archive is empty.");

    [zip CloseZip];
    return;
}

// ------------------------------------------------------------
// Get the first ZIP entry.
// 
// EntryAt(0,entry) initializes the ZipEntry object so that
// it represents the first entry in the ZIP archive.
// 
CkoZipEntry *entry = [[CkoZipEntry alloc] init];

success = [zip EntryAt: [NSNumber numberWithInt: 0] entry: entry];
if (success == NO) {
    NSLog(@"%@",zip.LastErrorText);
    return;
}

// ------------------------------------------------------------
// Iterate through all ZIP entries.
// 
// GetNext updates the same ZipEntry object so that it
// represents the next entry in the ZIP archive.
// 
while ((success == YES)) {

    if (entry.IsDirectory == YES) {

        NSLog(@"%@%@",@"[Directory] ",entry.FileName);

    }
    else {

        NSLog(@"%@%@",@"[File] ",entry.FileName);
    }

    // Advance to the next entry.
    success = [entry GetNext];
}

[zip CloseZip];

NSLog(@"%@",@"Done.");