PPMD Compression: String to Compressed Bytes

Demonstrates how to compress a string to a compressed byte array using PPMD.

Download the Chilkat Compression ActiveX here: ChilkatCompression.zip
Unzip and register the DLL with regsvr32. (This is a pre-release)

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
set compress = Server.CreateObject("Chilkat.Compression")

'  Any string argument automatically begins a 30-day trial.
success = compress.UnlockComponent("30-day trial")
If (success <> 1) Then
    Response.Write "Compression component unlock failed" & "<br>"

End If

compress.Algorithm = "ppmd"

'  Create a long string to compress.
strData = "abcdefg1122334455667788"
strData = strData & vbCrLf
For i = 0 To 99
    strData = strData & "abcdefg1122334455667788"
    strData = strData & vbCrLf
Next

'  Depending on the programming language, the string
'  may be Unicode.  Tell the component to convert to
'  ansi (1-byte/char) prior to compression:
compress.Charset = "ansi"

'  PPMD compress the string:
compressedBytes = compress.CompressString(strData)

'  Decompress back to the original:

strOriginal = compress.DecompressString(compressedBytes)

'  Display the uncompressed original:
Response.Write Server.HTMLEncode( "--- Original ---") & "<br>"
Response.Write Server.HTMLEncode( strOriginal) & "<br>"
%>
</body>
</html>

Need a specific example? Send a request to support@chilkatsoft.com