(PowerShell) 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 .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

$success = $false

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

$zip = New-Object Chilkat.Zip

$success = $zip.NewZip("original.zip")
if ($success -eq $false) {
    $($zip.LastErrorText)
    exit
}

$charset = "utf-8"

$success = $zip.AddString("a.txt","Contents of file A",$charset)
if ($success -eq $false) {
    $($zip.LastErrorText)
    exit
}

$success = $zip.AddString("b.txt","Contents of file B",$charset)
if ($success -eq $false) {
    $($zip.LastErrorText)
    exit
}

$success = $zip.AddString("c.txt","Contents of file C",$charset)
if ($success -eq $false) {
    $($zip.LastErrorText)
    exit
}

# Write the ZIP archive to disk.
# 
# The ZIP now contains:
# 
#     a.txt
#     b.txt
#     c.txt
# 
$success = $zip.WriteZipAndClose()
if ($success -eq $false) {
    $($zip.LastErrorText)
    exit
}

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

$zip2 = New-Object Chilkat.Zip

$success = $zip2.OpenZip("original.zip")
if ($success -eq $false) {
    $($zip2.LastErrorText)
    exit
}

# Find the entry named "b.txt".
$entry = New-Object Chilkat.ZipEntry

$success = $zip2.EntryOf("b.txt",$entry)
if ($success -eq $false) {
    $($zip2.LastErrorText)
    exit
}

# 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 -eq $false) {
    $($zip2.LastErrorText)
    exit
}

# Write the modified ZIP archive to a new file.
$zip2.FileName = "modified.zip"

$success = $zip2.WriteZipAndClose()
if ($success -eq $false) {
    $($zip2.LastErrorText)
    exit
}

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

$("ZIP archive updated successfully.")