C#

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.

C#

bool 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;
}

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

Debug.WriteLine("Number of ZIP entries = " + Convert.ToString(numEntries));

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

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

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

    Debug.WriteLine("Entry " + Convert.ToString(i));
    Debug.WriteLine("  FileName: " + entry.FileName);
    Debug.WriteLine("  Uncompressed Length: " + Convert.ToString((int) entry.UncompressedLength));
    Debug.WriteLine("  Compressed Length: " + Convert.ToString((int) entry.CompressedLength));
    Debug.WriteLine("");

    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();

Debug.WriteLine("Done.");