(MFC) Gzip Compress In Memory and Base64 Encode

Demonstrates how to Gzip compress in-memory data and then encode the compressed data to base64.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkGzip.h>
#include <CkBinData.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkGzip gzip;

    // This example will load a file into the fileData object.
    // Your application might load fileData from other sources..
    CkBinData fileData;
    bool success = fileData.LoadFile("qa_data/xml/hamlet.xml");
    if (success != true) {
        strOut.append("Failed to load file.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // In-place compress the contents of fileData
    success = gzip.CompressBd(fileData);
    if (success != true) {
        strOut.append(gzip.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Get the base64 encoded compressed data (in a single line).
    const char *strBase64 = fileData.getEncoded("base64");
    strOut.append(strBase64);
    strOut.append("\r\n");
    strOut.append("--------");
    strOut.append("\r\n");

    // To get the base64 in multiple lines, as it might appear in MIME,
    // use "base64-mime".
    const char *strBase64MultiLine = fileData.getEncoded("base64-mime");
    strOut.append(strBase64MultiLine);
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }