Send a 4-byte Length Prefix over a Socket

See more Socket/SSL/TLS Examples

Demonstrates Socket.SendCount, which sends a four-byte length prefix in network byte order. This is typically used to tell the peer how many bytes follow.

local chilkat = require("chilkat")

local socket = chilkat.Socket.new()

-- Connect to the server using TLS.
local bTls = true
local maxWaitMs = 5000
local success = socket:connect("example.com", 5000, bTls, maxWaitMs)
if not success then
    print(socket.last_error_text)
    return
end

-- Send a four-byte length prefix in network byte order.  A common framing pattern is to send the
-- number of bytes in a message before the message itself, so the peer knows exactly how many bytes
-- to read.
local messageLength = 512
success = socket:send_count(messageLength)
if not success then
    print(socket.last_error_text)
    return
end

print("Length prefix sent.")