(Unicode 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.

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

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#include <CkZipW.h>
#include <CkZipEntryW.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    CkZipW zip;

    success = zip.NewZip(L"c:/temp/sampleText.zip");
    if (success == false) {
        wprintf(L"%s\n",zip.lastErrorText());
        return;
    }

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

    // Write the ZIP archive to disk and close it.
    success = zip.WriteZipAndClose();
    if (success == false) {
        wprintf(L"%s\n",zip.lastErrorText());
        return;
    }

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

    CkZipW zip2;

    success = zip2.OpenZip(L"c:/temp/sampleText.zip");
    if (success == false) {
        wprintf(L"%s\n",zip2.lastErrorText());
        return;
    }

    // Get the text file entry.
    CkZipEntryW entry;

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

    if (success == false) {
        wprintf(L"Entry not found.\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 wchar_t *b64 = entry.copyToBase64();

    wprintf(L"Base64 compressed ZIP entry data:\n");
    wprintf(L"%s\n",b64);

    zip2.CloseZip();

    wprintf(L"Done.\n");
    }