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.

C#

bool success = false;

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

//  Open an existing ZIP archive.
success = zip.OpenZip("c:/temp/example.zip");
if (success == false) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

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

    Debug.WriteLine("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.
//  
Chilkat.ZipEntry entry = new Chilkat.ZipEntry();

success = zip.EntryAt(0,entry);
if (success == false) {
    Debug.WriteLine(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 == true)) {

    if (entry.IsDirectory == true) {

        Debug.WriteLine("[Directory] " + entry.FileName);

    }
    else {

        Debug.WriteLine("[File] " + entry.FileName);
    }

    //  Advance to the next entry.
    success = entry.GetNext();
}

zip.CloseZip();

Debug.WriteLine("Done.");