(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.

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

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#include <CkZip.h>
#include <CkZipEntry.h>

void ChilkatSample(void)
    {
    bool success = false;

    success = false;

    // Open an existing ZIP archive.
    CkZip zip;

    success = zip.OpenZip("example.zip");
    if (success == false) {
        std::cout << zip.lastErrorText() << "\r\n";
        return;
    }

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

    std::cout << "Number of ZIP entries = " << numEntries << "\r\n";

    // Create a ZipEntry object that will be reused
    // for each entry retrieved by EntryAt.
    CkZipEntry entry;

    // 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) {
            std::cout << zip.lastErrorText() << "\r\n";
            return;
        }

        std::cout << "Entry " << i << "\r\n";
        std::cout << "  FileName: " << entry.fileName() << "\r\n";
        std::cout << "  Uncompressed Length: " << entry.get_UncompressedLength() << "\r\n";
        std::cout << "  Compressed Length: " << entry.get_CompressedLength() << "\r\n";
        std::cout << "" << "\r\n";

        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();

    std::cout << "Done." << "\r\n";
    }