Java Requires Chilkat v11.0.0+

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

Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Zip;
import com.chilkatsoft.chilkat2.ZipEntry;

public class ChilkatExample {

    public static void main(String[] args) {
        // Open an existing ZIP archive.
        Zip zip = new Zip();

        try {
            zip.openZip("example.zip");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

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

        try {
            zip.entryAt(0, entry);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("Original entry:");
        System.out.println("  FileName: " + entry.getFileName());
        System.out.println("  EntryID: " + entry.getEntryID());
        System.out.println("");

        // Save the EntryID for later use.
        int entryId = entry.getEntryID();

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

        // Retrieve the same entry using EntryById.
        try {
            zip.entryById(entryId, entry2);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("Entry retrieved by EntryID:");
        System.out.println("  FileName: " + entry2.getFileName());
        System.out.println("  EntryID: " + entry2.getEntryID());
        System.out.println("");

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

        System.out.println("Done.");
    }
}