Append File and Rename within Zip

How to append an additional file to a .zip and rename it within the .zip.

Download Chilkat Ruby Library

require 'chilkat'

zip = Chilkat::CkZip.new()

#  Any string unlocks the component for the 1st 30-days.
success = zip.UnlockComponent("Anything for 30-day trial")
if (success != true)
    print zip.lastErrorText() + "\n"
    exit
end

#  Open an existing .zip.
#  Note: Opening a zip does not read the entire zip into memory.
#  It simply opens the zip and makes it ready for unzipping
#  or retrieving information and/or data.
success = zip.OpenZip("a.zip")
if (success != true)
    print zip.lastErrorText() + "\n"
    exit
end

#  Save the current number of entries.
numEntries = zip.get_NumEntries()

#  Append a new file to the .zip.
#  The new entry is at index numEntries (indexing begins at 0).
#  Note: The AppendOneFileOrDir simply adds a reference to the
#  file to the zip object.  The file is not actually read
#  or physically added to the .zip file until the WriteZip or
#  WriteZipAndClose method is called.
success = zip.AppendOneFileOrDir("hamlet.xml")
if (success != true)
    print zip.lastErrorText() + "\n"
    exit
end

#  Get the entry we just added:

entry = zip.GetEntryByIndex(numEntries)

#  Change the filename.
#  The zip component remembers the file referenced in the filesystem.
#  When the zip is written, the "hamlet.xml" file is read and
#  compressed, but the filename within the zip will be "shakespearePlay.xml".
entry.put_FileName("shakespearePlay.xml")

#  Write the .zip
#  The Chilkat Zip component always writes to a temporary file
#  first.  This is to ensure that (in cases like this), if something
#  goes wrong we don't lose the original .zip.  If the write
#  finishes without error, it is moved to the destination
#  file, thus overwriting it.  The TempDir property controls
#  the directory where the temp zip is written.
success = zip.WriteZipAndClose()
if (success != true)
    print zip.lastErrorText() + "\n"
    exit
end