(Ruby) Remove an Entry from an Existing ZIP Using DeleteEntry

This example demonstrates how to use the DeleteEntry method to remove a file from an existing ZIP archive.

The example:

• Creates a ZIP archive containing three text files
• Opens the ZIP archive for modification
• Finds and deletes one entry
• Writes the modified ZIP archive to a new filename

Suppose the original ZIP archive contains:

a.txt
b.txt
c.txt

After deleting b.txt, the modified ZIP archive contains:

a.txt
c.txt

The entry is removed only from the in-memory ZIP object until a Write* method is called.

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

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

success = false

success = false

# ------------------------------------------------------------
# First create a ZIP archive containing three text files.

zip = Chilkat::CkZip.new()

success = zip.NewZip("original.zip")
if (success == false)
    print zip.lastErrorText() + "\n";
    exit
end

charset = "utf-8"

success = zip.AddString("a.txt","Contents of file A",charset)
if (success == false)
    print zip.lastErrorText() + "\n";
    exit
end

success = zip.AddString("b.txt","Contents of file B",charset)
if (success == false)
    print zip.lastErrorText() + "\n";
    exit
end

success = zip.AddString("c.txt","Contents of file C",charset)
if (success == false)
    print zip.lastErrorText() + "\n";
    exit
end

# Write the ZIP archive to disk.
# 
# The ZIP now contains:
# 
#     a.txt
#     b.txt
#     c.txt
# 
success = zip.WriteZipAndClose()
if (success == false)
    print zip.lastErrorText() + "\n";
    exit
end

# ------------------------------------------------------------
# Open the existing ZIP archive for modification.

zip2 = Chilkat::CkZip.new()

success = zip2.OpenZip("original.zip")
if (success == false)
    print zip2.lastErrorText() + "\n";
    exit
end

# Find the entry named "b.txt".
entry = Chilkat::CkZipEntry.new()

success = zip2.EntryOf("b.txt",entry)
if (success == false)
    print zip2.lastErrorText() + "\n";
    exit
end

# Remove the entry from the in-memory ZIP object.
# 
# At this point, the original ZIP file on disk is unchanged.
# The deletion takes effect only after WriteZip or
# WriteZipAndClose is called.
success = zip2.DeleteEntry(entry)
if (success == false)
    print zip2.lastErrorText() + "\n";
    exit
end

# Write the modified ZIP archive to a new file.
zip2.put_FileName("modified.zip")

success = zip2.WriteZipAndClose()
if (success == false)
    print zip2.lastErrorText() + "\n";
    exit
end

# The modified ZIP now contains:
# 
#     a.txt
#     c.txt
# 

print "ZIP archive updated successfully." + "\n";