Lua Requires Chilkat v11.0.0+

Extract a Single ZIP Entry While Preserving Its Stored Path

See more Zip Examples

This example demonstrates how to use the ZipEntry.Extract method to extract a single entry from a ZIP archive.

The example first creates a ZIP archive containing a text file. It then re-opens the ZIP, finds the entry, and extracts it to a base directory.

The Extract method uses the relative path stored within the ZIP entry. Any required subdirectories are created automatically beneath the specified base directory.

Lua

local chilkat = require("chilkat")

-- ------------------------------------------------------------
-- First create a sample ZIP archive containing a small text file.

local zip = chilkat.Zip.new()

local success = zip:new_zip("c:/temp/sampleText.zip")
if not success then
    print(zip.last_error_text)
    return
end

-- Add a small text file from memory.
success = zip:add_string("myApp/docs/hello.txt", "Hello from a ZIP entry!", "utf-8")
if not success then
    print(zip.last_error_text)
    return
end

-- Write the ZIP archive to disk and close it.
success = zip:write_zip_and_close()
if not success then
    print(zip.last_error_text)
    return
end

-- ------------------------------------------------------------
-- Now open the ZIP archive we just created.

local zip2 = chilkat.Zip.new()

success = zip2:open_zip("c:/temp/sampleText.zip")
if not success then
    print(zip2.last_error_text)
    return
end

-- Find the entry by its stored ZIP path.
local entry = chilkat.ZipEntry.new()

success = zip2:entry_of("myApp/docs/hello.txt", entry)

if not success then
    print("Entry not found.")
    return
end

-- Extract this single entry to the base directory:
--
--     c:/temp/extracted
--
-- Because the entry's stored path is:
--
--     myApp/docs/hello.txt
--
-- the file will be extracted to:
--
--     qa_output/extracted/myApp/docs/hello.txt
--
-- The required subdirectories are created automatically.
success = entry:extract("c:/temp/extracted")
if not success then
    print(entry.last_error_text)
    return
end

zip2:close_zip()

print("Entry extracted successfully.")