Lua

Receive a 32-bit Integer from a Socket

Demonstrates Socket.ReceiveInt32, which reads exactly four bytes as a signed 32-bit integer and stores the result in the ReceivedInt property. Byte order is selectable.

Background. Fixed-size integers and length prefixes are common building blocks for application-defined binary protocols. Byte order is selectable, with big-endian being network byte order.

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Lua

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

-- Read exactly four bytes as a signed 32-bit integer and store the result in the ReceivedInt
-- property.  The argument selects byte order (true = big-endian, network byte order).
local bBigEndian = true
success = socket:receive_int32(bBigEndian)
if not success then
    print(socket.last_error_text)
    return
end

print("Received 32-bit integer: " .. socket.received_int)