sysutils.watch() | LuaRT free and open source Windows programming framework for Lua

sysutils.watch(folder, func)

Monitors a directory for changes in the background.

Parameters

folder

The folder to be watched, as a string or as a Directory

func

A callback function that will be called each time a directory change has been detected.

This function receives the following arguments :

The action that occured as a string among "new", "removed", "modified", or "renamed"
The concerned File or Directory
A third argument only if the action is "renamed", which contains the renamed File or Directory

Return value

Returns a Task instance that will run forever in the background.

Example


local sysutils = require "sysutils"

-- function callback for the sysutils.watch() function
local function onChange(action, entry, newentry)
    print("Folder change detected : "..entry.name.."\t("..action..")")
end

-- Watch for changes in the current directory
local task = sysutils.watch(sys.currentdir, onChange)

-- creates a file "test.txt"
local f = sys.File('test.txt')
f:open("write")

-- Writes to the file
f:write("it's a test")
f:close()

-- Removes the file
f:remove()

-- sleep to run the background Task
sleep()