Get an FTP Listing Entry's Size (32-bit)

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Demonstrates the Chilkat Ftp2.GetSize method, which returns the size in bytes of a cached directory-listing entry as a 32-bit integer. The only argument is a zero-based index. It returns -1 when the index is invalid or the size is unavailable.

Background: The size comes from the cached listing, so reading it for every entry costs no extra round trips. A 32-bit result cannot represent files past about 2 GB, so use GetSize64 (or GetSizeStr) when large files are possible. Directories often report no meaningful size and come back as -1, which is why the -1 case is worth handling rather than printing blindly.

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    success := false

    //  Demonstrates the Ftp2.GetSize method, which returns the size in bytes of a cached
    //  directory-listing entry as a 32-bit integer.  The only argument is a zero-based index.

    ftp := chilkat.NewFtp2()

    ftp.SetHostname("ftp.example.com")
    ftp.SetUsername("myFtpLogin")

    //  Normally you would not hard-code the password in source.  You should instead obtain it
    //  from an interactive prompt, environment variable, or a secrets vault.
    ftp.SetPassword("myPassword")

    success = ftp.Connect()
    if success == false {
        fmt.Println(ftp.LastErrorText())
        ftp.DisposeFtp2()
        return
    }

    success = ftp.ChangeRemoteDir("public_html")
    if success == false {
        fmt.Println(ftp.LastErrorText())
        ftp.DisposeFtp2()
        return
    }

    //  GetDirCount retrieves the directory listing on the first call and returns the number of
    //  entries.  A negative return indicates failure.
    n := ftp.GetDirCount()
    if n < 0 {
        fmt.Println(ftp.LastErrorText())
        ftp.DisposeFtp2()
        return
    }

    var i int
    for i = 0; i <= n - 1; i++ {
        name := ftp.GetFilename(i)

        //  GetSize returns -1 when the index is invalid or the size is unavailable (for example for a
        //  directory).  Use GetSize64 for files that may exceed 2 GB.
        fileSize := ftp.GetSize(i)
        fmt.Println(*name, "  ", fileSize, " bytes")
    }

    success = ftp.Disconnect()
    if success == false {
        fmt.Println(ftp.LastErrorText())
        ftp.DisposeFtp2()
        return
    }


    ftp.DisposeFtp2()