Lua

Append Dir Tree to Existing Zip w/out Rewriting Entire Zip

See more Zip Examples

Demonstrates how to use the QuickAppend method to append a directory tree to an existing .zip archive. This method works by editing the existing .zip -- it does not rewrite or recompress the contents of the existing .zip. It is the fastest way to append additional files to a pre-existing large .zip archive. Lua

local chilkat = require("chilkat")

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

local zip = chilkat.Zip.new()

-- The NewZip method only initializes the Zip object -- it does
-- not create or write a .zip file.
local success = zip:new_zip("notUsed.zip")
if not success then
    print(zip.last_error_text)
    return
end

-- Add a references to all files in a directory tree.
-- Note: this does not read or compress the file contents --
-- it simply adds file references to the zip object.
local recurse = true
success = zip:append_files("c:/temp/abc123/*", recurse)
if not success then
    print(zip.last_error_text)
    return
end

-- Appends the contents of the zip object to the preExisting.zip
-- zip archive.  preExisting.zip is opened, and the files
-- referenced by this zip object are streamed in, compressed,
-- and appended to the end of the archive.
success = zip:quick_append("preExisting.zip")
if not success then
    print(zip.last_error_text)
    return
end

print("Success!")

-- Note: Additional files, directory trees, or in-memory data
-- can be appended by calling AddFile, AppendFiles,
-- AddString, AddBd, AddSb, etc. multiple times.
-- Whatever files and/or in-memory data that are referenced by
-- this zip object will be appended to preExisting.zip when
-- QuickAppend is called.