(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 <C_CkZipW.h>
#include <C_CkZipEntryW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkZipW zip;
    HCkZipW zip2;
    HCkZipEntryW entry;
    const wchar_t *b64;

    success = FALSE;

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

    zip = CkZipW_Create();

    success = CkZipW_NewZip(zip,L"c:/temp/sampleText.zip");
    if (success == FALSE) {
        wprintf(L"%s\n",CkZipW_lastErrorText(zip));
        CkZipW_Dispose(zip);
        return;
    }

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

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

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

    zip2 = CkZipW_Create();

    success = CkZipW_OpenZip(zip2,L"c:/temp/sampleText.zip");
    if (success == FALSE) {
        wprintf(L"%s\n",CkZipW_lastErrorText(zip2));
        CkZipW_Dispose(zip);
        CkZipW_Dispose(zip2);
        return;
    }

    // Get the text file entry.
    entry = CkZipEntryW_Create();

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

    if (success == FALSE) {
        wprintf(L"Entry not found.\n");
        CkZipW_Dispose(zip);
        CkZipW_Dispose(zip2);
        CkZipEntryW_Dispose(entry);
        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!".
    b64 = CkZipEntryW_copyToBase64(entry);

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

    CkZipW_CloseZip(zip2);

    wprintf(L"Done.\n");


    CkZipW_Dispose(zip);
    CkZipW_Dispose(zip2);
    CkZipEntryW_Dispose(entry);

    }