(Classic ASP) Compress String Feed to Base64

This example receives incoming text data in chunks, compresses as a stream, and accumulates the compressed data in base64.

The purpose is to demonstrate the BeginCompressStringENC, MoreCompressStringENC, and EndCompressStringENC methods.

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>
<%
' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

set sbCompressedBase64 = Server.CreateObject("Chilkat_9_5_0.StringBuilder")

set compress = Server.CreateObject("Chilkat_9_5_0.Compression")
compress.Algorithm = "deflate"
compress.Charset = "utf-8"
compress.EncodingMode = "base64"

set sbIndex = Server.CreateObject("Chilkat_9_5_0.StringBuilder")

For i = 0 To 24
    ' Note: It is possible (and normal) for a BeginCompress* or MoreCompress* method to return
    ' an empty string (or 0 bytes).  When this happens, the input data is not lost.  It will be flushed
    ' in a subsequent call.
    sbIndex.Clear 
    success = sbIndex.AppendInt(i)
    If (i = 0) Then
        success = sbCompressedBase64.Append(compress.BeginCompressStringENC(sbIndex.GetAsString()))
    Else
        success = sbCompressedBase64.Append(compress.MoreCompressStringENC(sbIndex.GetAsString()))
    End If

    success = sbCompressedBase64.Append(compress.MoreCompressStringENC(": This is a line of data to be compressed..." & vbCrLf))
Next

' Flush any remaining output.
success = sbCompressedBase64.Append(compress.EndCompressStringENC())

Response.Write "<pre>" & Server.HTMLEncode( "The base64 encoded compressed text:") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( sbCompressedBase64.GetAsString()) & "</pre>"

' Now decompress in one call:
originalText = compress.DecompressStringENC(sbCompressedBase64.GetAsString())
Response.Write "<pre>" & Server.HTMLEncode( originalText) & "</pre>"

%>
</body>
</html>