Check File Size using HEAD Request

Demonstrates how to quickly check the size of an HTTP download by using the HEAD request.

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

FreeBSD C++ Libraries

HP-UX C++ Libraries

BlackBerry QNX C++ Libraries

// Needs #include <CkHttp.h>
// Needs #include <CkHttpResponse.h>

    CkString strOut;

    CkHttp http;

    bool success;

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

    //  Send a HEAD request to get the response header:
    CkHttpResponse *response = 0;
    response = http.GetHead("http://www.chilkatsoft.com/download/ChilkatDotNet2.msi");

    if (response == 0 ) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
    }
    else {

        //  The ContentLength property of the HTTP response is
        //  the size of the remote file:
        strOut.append("Size of download = ");
        strOut.appendInt(response->get_ContentLength());
        strOut.append("\r\n");

    }


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());