(Classic ASP) 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 ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

success = 0

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

set zip = Server.CreateObject("Chilkat.Zip")

success = zip.NewZip("original.zip")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( zip.LastErrorText) & "</pre>"
    Response.End
End If

charset = "utf-8"

success = zip.AddString("a.txt","Contents of file A",charset)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( zip.LastErrorText) & "</pre>"
    Response.End
End If

success = zip.AddString("b.txt","Contents of file B",charset)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( zip.LastErrorText) & "</pre>"
    Response.End
End If

success = zip.AddString("c.txt","Contents of file C",charset)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( zip.LastErrorText) & "</pre>"
    Response.End
End If

' Write the ZIP archive to disk.
' 
' The ZIP now contains:
' 
'     a.txt
'     b.txt
'     c.txt
' 
success = zip.WriteZipAndClose()
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( zip.LastErrorText) & "</pre>"
    Response.End
End If

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

set zip2 = Server.CreateObject("Chilkat.Zip")

success = zip2.OpenZip("original.zip")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( zip2.LastErrorText) & "</pre>"
    Response.End
End If

' Find the entry named "b.txt".
set entry = Server.CreateObject("Chilkat.ZipEntry")

success = zip2.EntryOf("b.txt",entry)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( zip2.LastErrorText) & "</pre>"
    Response.End
End If

' 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 = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( zip2.LastErrorText) & "</pre>"
    Response.End
End If

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

success = zip2.WriteZipAndClose()
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( zip2.LastErrorText) & "</pre>"
    Response.End
End If

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

Response.Write "<pre>" & Server.HTMLEncode( "ZIP archive updated successfully.") & "</pre>"

%>
</body>
</html>