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Classic ASP Examples

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(Classic ASP) Streaming Compression

Compress and decompress using a stream.

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>
<%
set fac = Server.CreateObject("Chilkat_9_5_0.FileAccess")
set compress = Server.CreateObject("Chilkat_9_5_0.Compression")

success = compress.UnlockComponent("Anything for 30-day trial.")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( compress.LastErrorText) & "</pre>"
    Response.End
End If

compress.Algorithm = "deflate"

set streamC = Server.CreateObject("Chilkat_9_5_0.Stream")

'  This example sets the source and sink of the stream to files.
'  A stream can have use other streams as a source or sink,
'  or the application can itself be the source/sink by directly
'  reading or writing a stream.  (See below for an example of this..)
streamC.SourceFile = "qa_data/hamlet.xml"
streamC.SinkFile = "qa_output/hamlet_compressed.dat"

'  Compress from source to sink.
success = compress.CompressStream(streamC)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( compress.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "File-to-file deflate compression successful.") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "Original size = " & fac.FileSize(streamC.SourceFile)) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "Compressed size = " & fac.FileSize(streamC.SinkFile)) & "</pre>"

'  Now do file-to-file decompression
set streamD = Server.CreateObject("Chilkat_9_5_0.Stream")
streamD.SourceFile = "qa_output/hamlet_compressed.dat"
streamD.SinkFile = "qa_output/hamlet_restored.xml"

'  Decompress from source to sink.
success = compress.DecompressStream(streamD)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( compress.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "File-to-file deflate decompression successful.") & "</pre>"

'  Let's double-check to see that the files are equal in size and content:

bFilesEqual = fac.FileContentsEqual(streamC.SourceFile,streamD.SinkFile)
If (bFilesEqual <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "The output file is not equal to the input file!") & "</pre>"
Else
    Response.Write "<pre>" & Server.HTMLEncode( "The file was successfully compressed and decompressed.") & "</pre>"
End If

'  ---------------------------------------------------------------------
'  Now let's decompress again, but this time w/ the application reading
'  the decompressed data directly from a stream.
set streamA = Server.CreateObject("Chilkat_9_5_0.Stream")

streamA.SourceFile = "qa_output/hamlet_compressed.dat"

'  Start decompressing in a background thread.
' task is a Chilkat_9_5_0.Task
Set task = compress.DecompressStreamAsync(streamA)
success = task.Run()

'  Read decompressed data from streamA:

Do While (streamA.EndOfStream <> 1)
    If (streamA.DataAvailable = 1) Then
        decompressedText = streamA.ReadString()
        Response.Write "<pre>" & Server.HTMLEncode( decompressedText) & "</pre>"
    End If

Loop

'  Let's make sure the background task finished and that the decompress was successful.
'  It should already be the case that the task is finished.
Do While (task.Finished <> 1)
    task.SleepMs 20
Loop

'  The decompressor may have finished, but it is possible that data
'  remains to be flushed.
If (streamA.DataAvailable = 1) Then
    decompressedText = streamA.ReadString()
    Response.Write "<pre>" & Server.HTMLEncode( decompressedText) & "</pre>"
End If

'  Did streamA succeed in reading the entire file?
If (task.TaskSuccess <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "async decompress failed:") & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( task.ResultErrorText) & "</pre>"
    success = 0
End If

Response.Write "<pre>" & Server.HTMLEncode( "The async decompress was successful.") & "</pre>"

%>
</body>
</html>

 

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