(Swift) Extract a Single ZIP Entry While Preserving Its Stored Path

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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.

Note: This example requires Chilkat v11.0.0 or greater.

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func chilkatTest() {
    var success: Bool = false

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

    let zip = CkoZip()!

    success = zip.newZip("c:/temp/sampleText.zip")
    if success == false {
        print("\(zip.lastErrorText!)")
        return
    }

    // Add a small text file from memory.
    success = zip.addString("myApp/docs/hello.txt", content: "Hello from a ZIP entry!", charset: "utf-8")
    if success == false {
        print("\(zip.lastErrorText!)")
        return
    }

    // Write the ZIP archive to disk and close it.
    success = zip.writeAndClose()
    if success == false {
        print("\(zip.lastErrorText!)")
        return
    }

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

    let zip2 = CkoZip()!

    success = zip2.open("c:/temp/sampleText.zip")
    if success == false {
        print("\(zip2.lastErrorText!)")
        return
    }

    // Find the entry by its stored ZIP path.
    let entry = CkoZipEntry()!

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

    if success == false {
        print("Entry not found.")
        return
    }

    // 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 success == false {
        print("\(entry.lastErrorText!)")
        return
    }

    zip2.close()

    print("Entry extracted successfully.")

}