(C#) Find a ZIP Entry by EntryID Using EntryById

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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

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

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bool success = false;

success = false;

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

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

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

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

Debug.WriteLine("Original entry:");
Debug.WriteLine("  FileName: " + entry.FileName);
Debug.WriteLine("  EntryID: " + Convert.ToString(entry.EntryID));
Debug.WriteLine("");

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

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

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

Debug.WriteLine("Entry retrieved by EntryID:");
Debug.WriteLine("  FileName: " + entry2.FileName);
Debug.WriteLine("  EntryID: " + Convert.ToString(entry2.EntryID));
Debug.WriteLine("");

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

Debug.WriteLine("Done.");