Lua

Get a Remote FTP File's Size by Name as a String

Demonstrates the Chilkat Ftp2.GetSizeStrByName method, which returns the size in bytes of a named file in the current remote directory as a decimal string. The only argument is the filename.

Background: Returning the size as text avoids integer-width limits entirely, so this is the safe choice for a file of any size and for languages without a convenient large-integer type. Like the other by-name lookups it takes a bare filename in the current directory; parse the string when you need arithmetic, or use it directly for display.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the Ftp2.GetSizeStrByName method, which returns the size in bytes of a named file
-- in the current remote directory as a decimal string.  The only argument is the filename.

local ftp = chilkat.Ftp2.new()

ftp.hostname = "ftp.example.com"
ftp.username = "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.password = "myPassword"

local success = ftp:connect()
if not success then
    print(ftp.last_error_text)
    return
end

success = ftp:change_remote_dir("public_html")
if not success then
    print(ftp.last_error_text)
    return
end

-- The string form avoids integer-size limits, so it is safe for files of any size.
local fileSize = ftp:get_size_str_by_name("bigfile.zip")
if not ftp.last_method_success then
    print(ftp.last_error_text)
    return
end

print("bigfile.zip is " .. fileSize .. " bytes")

success = ftp:disconnect()
if not success then
    print(ftp.last_error_text)
    return
end