Node.js

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.

Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    success = false;

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

    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 chilkat.ZipEntry();

    // 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.");

}

chilkatExample();