C++

Get Compressed ZIP Entry Data as Base64 Using ZipEntry.CopyToBase64

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This example creates a small ZIP archive containing a text file added from memory, writes the ZIP to disk, re-opens it, and then uses ZipEntry.CopyToBase64 to retrieve the compressed data for the text file as a Base64-encoded string.

The Base64 string returned by CopyToBase64 represents the compressed bytes stored for the entry inside the ZIP archive. It is not the original uncompressed text data.

C++

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

void ChilkatSample(void)
    {
    bool success = false;

    // ------------------------------------------------------------
    // First create a sample ZIP archive containing a small text file.

    CkZip zip;

    success = zip.NewZip("c:/temp/sampleText.zip");
    if (success == false) {
        std::cout << zip.lastErrorText() << "\r\n";
        return;
    }

    // Add a small text file from memory.
    // The text is stored in the ZIP as "hello.txt".
    success = zip.AddString("hello.txt","Hello from a ZIP entry!","utf-8");
    if (success == false) {
        std::cout << zip.lastErrorText() << "\r\n";
        return;
    }

    // Write the ZIP archive to disk and close it.
    success = zip.WriteZipAndClose();
    if (success == false) {
        std::cout << zip.lastErrorText() << "\r\n";
        return;
    }

    // ------------------------------------------------------------
    // Now open the ZIP archive we just created.

    CkZip zip2;

    success = zip2.OpenZip("c:/temp/sampleText.zip");
    if (success == false) {
        std::cout << zip2.lastErrorText() << "\r\n";
        return;
    }

    // Get the text file entry.
    CkZipEntry entry;

    success = zip2.EntryOf("hello.txt",entry);

    if (success == false) {
        std::cout << "Entry not found." << "\r\n";
        return;
    }

    // Get the compressed ZIP entry data as Base64.
    // 
    // This is the compressed data stored inside the ZIP file,
    // not the uncompressed text "Hello from a ZIP entry!".
    const char *b64 = entry.copyToBase64();

    std::cout << "Base64 compressed ZIP entry data:" << "\r\n";
    std::cout << b64 << "\r\n";

    zip2.CloseZip();

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