(JavaScript) 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.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

var zip = new CkZip();

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

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

    console.log("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.
// 
var entry = new CkZipEntry();

success = zip.EntryAt(0,entry);
if (success == false) {
    console.log(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) {

        console.log("[Directory] " + entry.FileName);

    }
    else {

        console.log("[File] " + entry.FileName);
    }

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

zip.CloseZip();

console.log("Done.");