Objective-C

Iterate Through ZIP Entries Using EntryAt and ZipEntry.GetNext

See more Zip Examples

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.

Objective-C

#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.");