GZip Create .gz File

Demonstrates how to compress a file to create a .gz (GZip) file.

Note: The .gz file format is a compressed file format. It contains a single file. The .gz file format is not an archive format (i.e. it does not contain a collection of files/directories such as with the .zip, .rar, or .tar file formats). GZip is often combined with TAR to create a .tgz (or .tar.gz).

Note: It is possible for a .gz to contain more than one file, but this is very uncommon.

Downloads:

MS Windows Visual C/C++ Libraries

Linux/CentOS C/C++ Libraries

MAC OS X C/C++ Libraries

Solaris C/C++ Libraries

C++ Builder Libraries

// Needs #include <CkGzip.h>

    CkString strOut;


    CkGzip gzip;

    bool success;

    //  Any string unlocks the component for the 1st 30-days.
    success = gzip.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        strOut.append(gzip.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  File-to-file GZip:
    //  Compress "hamlet.xml" to create "hamlet.xml.gz"
    success = gzip.CompressFile("hamlet.xml","hamlet.xml.gz");
    if (success != true) {
        strOut.append(gzip.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  File-to-file ungzip
    //  Decompress "hamlet.xml.gz" to create "hamletOut.xml"
    success = gzip.UncompressFile("hamlet.xml.gz","hamletOut.xml");
    if (success != true) {
        strOut.append(gzip.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  File-to-string ungzip
    //  Decompress the contents of a .gz directly to a string variable:
    //  The 2nd argument indicates the charset of the character
    //  data after it is decompressed.
    const char * xmlStr;
    xmlStr = gzip.uncompressFileToString("hamlet.xml.gz","utf-8");
    if (success != true) {
        strOut.append(gzip.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append(xmlStr);
    strOut.append("\r\n");

    //  The Chilkat GZip API provides much more flexibility than shown
    //  here.  See the reference documentation at
    //  http://www.chilkatsoft.com/refdoc for more information.



    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());