(MFC) Compress Bytes

Demonstrates how to compress binary data.

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

See Also: Using MFC CString in Chilkat

#include <CkFileAccess.h>
#include <CkByteData.h>
#include <CkCompression.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkFileAccess fac;

    CkByteData fileBytes;
    success = fac.ReadEntireFile("qa_data/bmp/big.bmp",fileBytes);
    if (fac.get_LastMethodSuccess() != true) {
        strOut.append(fac.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkCompression compress;
    compress.put_Algorithm("deflate");

    CkByteData compressedBytes;
    success = compress.CompressBytes(fileBytes,compressedBytes);
    if (compress.get_LastMethodSuccess() != true) {
        strOut.append(compress.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    bool success = fac.WriteEntireFile("qa_output/compressedBmp.dat",compressedBytes);
    if (fac.get_LastMethodSuccess() != true) {
        strOut.append(fac.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }



    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }