Get Size of Download using HTTP HEAD

Get the size of a download using an HTTP 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;
    }

    CkHttpResponse *resp = 0;

    resp = http.GetHead("http://www.chilkatsoft.com/download/ChilkatDotNet2.msi");
    if (resp == 0 ) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
    }
    else {
        const char * sizeStr;
        sizeStr = resp->getHeaderField("Content-Length");
        if (sizeStr == 0 ) {
            strOut.append("No content-length header field\r\n");
        }
        else {
            //  Show the size of the file.
            //  You may convert the size string to an integer...
            strOut.append(sizeStr);
            strOut.append("\r\n");
        }

    }



    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());