X File

Supported platforms:
Available since: Gideros 2011.6

Description

A file object is usually returned by io.open used to manipulate (read and write) files in lua.

NOTE: this page and other related file methods use an X before the name because file is reserved by MediaWiki

Examples

--function to copy file
local function copy(src, dst)
	local srcf = io.open(src, "rb")
	local dstf = io.open(dst, "wb")

	local size = 2^13 -- good buffer size (8K)
	while true do
		local block = srcf:read(size)
		if not block then break end
		dstf:write(block)
	end
	srcf:close()
	dstf:close()
end

--function to check if file exists
local function exists(file)
	local f = io.open(file, "rb")
	if f == nil then return false end
	f:close() return true
end

--usage
if not exists("|D|database.db") then
	copy("database.db", "|D|database.db")
end

Methods file:close closes file file:flush saves any written data to file file:lines returns an iterator function file:read reads file according to given formats, returns read values or nil file:seek sets file seek pos file:write writes strings or numbers to file

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