(JavaScript) Iterate Over ZIP Entries Using EntryAt

This example demonstrates how to use the EntryAt method to iterate over all entries contained within a ZIP archive.

The EntryAt method retrieves a ZipEntry object for a given zero-based index.

This is useful for:

• Enumerating all entries in a ZIP archive
• Inspecting filenames, sizes, and timestamps
• Searching or filtering ZIP contents

Suppose the ZIP archive contains:

docs/readme.txt
images/logo.png
data/config.json

The example loops through all ZIP entries and prints information about each entry.

Note: This example requires Chilkat v11.0.0 or greater.

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;

success = false;

// Open an existing ZIP archive.
var zip = new CkZip();

success = zip.OpenZip("example.zip");
if (success == false) {
    console.log(zip.LastErrorText);
    return;
}

// Get the total number of entries in the ZIP archive.
var numEntries = zip.NumEntries;

console.log("Number of ZIP entries = " + numEntries);

// Create a ZipEntry object that will be reused
// for each entry retrieved by EntryAt.
var entry = new CkZipEntry();

// Iterate over all ZIP entries.
var i = 0;
while (i < numEntries) {

    // Retrieve the entry at index i.
    success = zip.EntryAt(i,entry);
    if (success == false) {
        console.log(zip.LastErrorText);
        return;
    }

    console.log("Entry " + i);
    console.log("  FileName: " + entry.FileName);
    console.log("  Uncompressed Length: " + entry.UncompressedLength);
    console.log("  Compressed Length: " + entry.CompressedLength);
    console.log("");

    i = i+1;
}

// Sample output:
// 
// Entry 0
//   FileName: docs/readme.txt
//   Uncompressed Length: 1204
//   Compressed Length: 512
// 
// Entry 1
//   FileName: images/logo.png
//   Uncompressed Length: 84211
//   Compressed Length: 84102
// 

zip.CloseZip();

console.log("Done.");