(MFC) Compress and Decompress a String

Demonstrates how to compress and decompress a string.

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

See Also: Using MFC CString in Chilkat

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

void ChilkatSample(void)
    {
    CkString strOut;

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

    bool success;
    CkStringBuilder sb;

    int i;
    for (i = 1; i <= 20; i++) {
        sb.Append("This is the original uncompressed string.\r\n");
    }

    CkCompression compress;
    compress.put_Algorithm("deflate");
    // Indicate that the utf-8 byte representation of the string should be compressed.
    compress.put_Charset("utf-8");

    CkByteData compressedBytes;
    success = compress.CompressString(sb.getAsString(),compressedBytes);

    // If the compressed data is desired in string format, then get the base64 representation of the bytes.
    compress.put_EncodingMode("base64");
    const char *compressedBase64 = compress.compressStringENC(sb.getAsString());
    strOut.append("Compressed Bytes as Base64: ");
    strOut.append(compressedBase64);
    strOut.append("\r\n");

    // Now decompress...
    const char *decompressedString = compress.decompressString(compressedBytes);
    strOut.append("The original string after decompressing from binary compressed data:");
    strOut.append("\r\n");
    strOut.append(decompressedString);
    strOut.append("\r\n");

    // To decompress from Base64...
    compress.put_EncodingMode("base64");
    decompressedString = compress.decompressStringENC(compressedBase64);
    strOut.append("The original string after decompressing from Base64:");
    strOut.append("\r\n");
    strOut.append(decompressedString);
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }