(Classic ASP) Get Compressed ZIP Entry Data as Base64 Using ZipEntry.CopyToBase64

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This example creates a small ZIP archive containing a text file added from memory, writes the ZIP to disk, re-opens it, and then uses ZipEntry.CopyToBase64 to retrieve the compressed data for the text file as a Base64-encoded string.

The Base64 string returned by CopyToBase64 represents the compressed bytes stored for the entry inside the ZIP archive. It is not the original uncompressed text data.

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

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

' ------------------------------------------------------------
' First create a sample ZIP archive containing a small text file.

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

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

' Add a small text file from memory.
' The text is stored in the ZIP as "hello.txt".
success = zip.AddString("hello.txt","Hello from a ZIP entry!","utf-8")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( zip.LastErrorText) & "</pre>"
    Response.End
End If

' Write the ZIP archive to disk and close it.
success = zip.WriteZipAndClose()
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( zip.LastErrorText) & "</pre>"
    Response.End
End If

' ------------------------------------------------------------
' Now open the ZIP archive we just created.

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

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

' Get the text file entry.
set entry = Server.CreateObject("Chilkat.ZipEntry")

success = zip2.EntryOf("hello.txt",entry)

If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Entry not found.") & "</pre>"
    Response.End
End If

' Get the compressed ZIP entry data as Base64.
' 
' This is the compressed data stored inside the ZIP file,
' not the uncompressed text "Hello from a ZIP entry!".
b64 = entry.CopyToBase64()

Response.Write "<pre>" & Server.HTMLEncode( "Base64 compressed ZIP entry data:") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( b64) & "</pre>"

zip2.CloseZip 

Response.Write "<pre>" & Server.HTMLEncode( "Done.") & "</pre>"

%>
</body>
</html>