(Swift) 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.

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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.AppendString("a.txt", textData: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
    entry = nil
    entry = zip.AppendString("b.txt", textData: "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb")
    entry = nil
    entry = zip.AppendString("c.txt", textData: "cccccccccccccccccccccccccccccccccccc")
    entry = nil

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

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

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

    print("success.")

}