(Swift) Get Compressed ZIP Entry Data as Base64 Using ZipEntry.CopyToBase64

See more Zip Examples

This example creates a small ZIP archive containing a text file added from memory, writes the ZIP to disk, re-opens it, and then uses ZipEntry.CopyToBase64 to retrieve the compressed data for the text file as a Base64-encoded string.

The Base64 string returned by CopyToBase64 represents the compressed bytes stored for the entry inside the ZIP archive. It is not the original uncompressed text data.

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

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

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.
    // The text is stored in the ZIP as "hello.txt".
    success = zip.addString("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
    }

    // Get the text file entry.
    let entry = CkoZipEntry()!

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

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

    // Get the compressed ZIP entry data as Base64.
    // 
    // This is the compressed data stored inside the ZIP file,
    // not the uncompressed text "Hello from a ZIP entry!".
    var b64: String? = entry.copyToBase64()

    print("Base64 compressed ZIP entry data:")
    print("\(b64!)")

    zip2.close()

    print("Done.")

}