Lua Requires Chilkat v11.0.0+

Replace/Update a FIle in a .zip

See more Zip Examples

Demonstrates how to replace/update a file from a .zip. Note: This requires the entire .zip to be rewritten. Lua

local chilkat = require("chilkat")

-- This requires the Chilkat Zip API to have been previously unlocked.
-- See Unlock Chilkat Zip for sample code.

-- First prepare a .zip and write it..
local zip = chilkat.Zip.new()

zip:new_zip("qa_output/abc.zip")

-- Add some files..
local charset = "utf-8"
zip:add_string("a.txt", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", charset)
zip:add_string("b.txt", "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb", charset)
zip:add_string("c.txt", "cccccccccccccccccccccccccccccccccccc", charset)

-- Write to qa_output/abc.zip
-- This .zip contains three files: a.txt, b.txt, and c.txt
local success = zip:write_zip_and_close()

-- -------------------------------------------------------------------
-- Open abc.zip, replace the content of the "b.txt" entry with something else, and re-write.
local zip2 = chilkat.Zip.new()
zip2:open_zip("qa_output/abc.zip")

local entry = chilkat.ZipEntry.new()
if zip2:entry_of("b.txt", entry) then
    entry:replace_string("This is the new content.  bbbbbbbbbbbbbbbbbbbbbb", "utf-8")
end

-- Write the modified .zip back to "abc.zip"
success = zip2:write_zip_and_close()

print("success.")