C++

Iterate Through ZIP Entries Using EntryAt and ZipEntry.GetNext

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This example demonstrates how to iterate through all entries in a ZIP archive using:

• Zip.EntryAt to obtain the first entry
• ZipEntry.GetNext to advance through the remaining entries

The example prints each ZIP entry's stored filename and whether the entry is a file or directory.

This approach is useful when sequentially processing ZIP entries without repeatedly calling EntryAt by index.

Suppose the ZIP archive contains:

docs/
docs/readme.txt
images/logo.png
hello.txt

The example iterates through each entry in the order stored within the ZIP archive.

C++

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

void ChilkatSample(void)
    {
    bool success = false;

    CkZip zip;

    // Open an existing ZIP archive.
    success = zip.OpenZip("c:/temp/example.zip");
    if (success == false) {
        std::cout << zip.lastErrorText() << "\r\n";
        return;
    }

    // A ZIP archive may contain zero entries.
    if (zip.get_NumEntries() == 0) {

        std::cout << "The ZIP archive is empty." << "\r\n";

        zip.CloseZip();
        return;
    }

    // ------------------------------------------------------------
    // Get the first ZIP entry.
    // 
    // EntryAt(0,entry) initializes the ZipEntry object so that
    // it represents the first entry in the ZIP archive.
    // 
    CkZipEntry entry;

    success = zip.EntryAt(0,entry);
    if (success == false) {
        std::cout << zip.lastErrorText() << "\r\n";
        return;
    }

    // ------------------------------------------------------------
    // Iterate through all ZIP entries.
    // 
    // GetNext updates the same ZipEntry object so that it
    // represents the next entry in the ZIP archive.
    // 
    while ((success == true)) {

        if (entry.get_IsDirectory() == true) {

            std::cout << "[Directory] " << entry.fileName() << "\r\n";

        }
        else {

            std::cout << "[File] " << entry.fileName() << "\r\n";
        }

        // Advance to the next entry.
        success = entry.GetNext();
    }

    zip.CloseZip();

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