Difference between revisions of "X File"
From GiderosMobile
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=== Examples === | === Examples === | ||
| − | < | + | <syntaxhighlight lang="lua"> |
--function to copy file | --function to copy file | ||
local function copy(src, dst) | local function copy(src, dst) | ||
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copy("database.db", "|D|database.db") | copy("database.db", "|D|database.db") | ||
end | end | ||
| − | </ | + | </syntaxhighlight> |
{|- | {|- | ||
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[[x_file:close|file:close]] ''closes file''<br/><!--GIDEROSMTD:file:close() closes file--> | [[x_file:close|file:close]] ''closes file''<br/><!--GIDEROSMTD:file:close() closes file--> | ||
[[x_file:flush|file:flush]] ''saves any written data to file''<br/><!--GIDEROSMTD:file:flush() saves any written data to file--> | [[x_file:flush|file:flush]] ''saves any written data to file''<br/><!--GIDEROSMTD:file:flush() saves any written data to file--> | ||
| − | [[x_file:lines|file:lines]] ''returns iterator function | + | [[x_file:lines|file:lines]] ''returns an iterator function''<br/><!--GIDEROSMTD:file:lines() returns an iterator function--> |
[[x_file:read|file:read]] ''reads file according to given formats, returns read values or nil''<br/><!--GIDEROSMTD:file:read(format1,...) reads file according to given formats, returns read values or nil--> | [[x_file:read|file:read]] ''reads file according to given formats, returns read values or nil''<br/><!--GIDEROSMTD:file:read(format1,...) reads file according to given formats, returns read values or nil--> | ||
| − | [[x_file:seek|file:seek]] ''sets file | + | [[x_file:seek|file:seek]] ''sets file seek pos''<br/><!--GIDEROSMTD:file:seek(whence,offset) sets file seek pos, whence="set"|"cur"|"end", defaults "curr",0, returns file pos--> |
[[x_file:write|file:write]] ''writes strings or numbers to file''<br/><!--GIDEROSMTD:file:write(value1,...) writes strings or numbers to file--> | [[x_file:write|file:write]] ''writes strings or numbers to file''<br/><!--GIDEROSMTD:file:write(value1,...) writes strings or numbers to file--> | ||
Latest revision as of 07:54, 4 November 2023
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 wiki forbids creating pages starting with file
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
Methodsfile:close closes file |
EventsConstants |
