(Swift 3,4,5...) Replace/Update a FIle in a .zip

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

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

func chilkatTest() {
    // 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..
    let zip = CkoZip()!

    var success: Bool
    zip.newZip("qa_output/abc.zip")

    // Add some files..
    var entry: CkoZipEntry? = zip.append("a.txt", str: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
    entry = nil
    entry = zip.append("b.txt", str: "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb")
    entry = nil
    entry = zip.append("c.txt", str: "cccccccccccccccccccccccccccccccccccc")
    entry = nil

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

    // -------------------------------------------------------------------
    // Open abc.zip, replace the content of the "b.txt" entry with something else, and re-write.
    let zip2 = CkoZip()!
    zip2.open("qa_output/abc.zip")

    entry = zip2.getEntryByName("b.txt")
    entry!.replace("This is the new content.  bbbbbbbbbbbbbbbbbbbbbb", charset: "utf-8")
    entry = nil
    // Write the modified .zip back to "abc.zip"
    success = zip2.writeAndClose()

    print("success.")

}