Node.js

Find a ZIP Entry by EntryID Using EntryById

See more Zip Examples

This example demonstrates how to use the EntryById method to retrieve a ZIP entry using its unique EntryID.

Each ZipEntry object has an EntryID property that uniquely identifies the entry within the currently open ZIP object.

This is useful when:

• An application stores EntryID values for later use
• ZIP entries need to be retrieved without searching by filename
• Multiple entries may have similar names or paths

The example:

• Opens a ZIP archive
• Retrieves an entry using EntryAt
• Saves the entry's EntryID
• Uses EntryById to retrieve the same entry later

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;
    }

    // Retrieve the first entry in the ZIP archive.
    var entry = new chilkat.ZipEntry();

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

    console.log("Original entry:");
    console.log("  FileName: " + entry.FileName);
    console.log("  EntryID: " + entry.EntryID);
    console.log("");

    // Save the EntryID for later use.
    var entryId = entry.EntryID;

    // Create another ZipEntry object.
    var entry2 = new chilkat.ZipEntry();

    // Retrieve the same entry using EntryById.
    success = zip.EntryById(entryId,entry2);
    if (success == false) {
        console.log(zip.LastErrorText);
        return;
    }

    console.log("Entry retrieved by EntryID:");
    console.log("  FileName: " + entry2.FileName);
    console.log("  EntryID: " + entry2.EntryID);
    console.log("");

    // The filenames and EntryID values should match.
    zip.CloseZip();

    console.log("Done.");

}

chilkatExample();