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(VB.NET) Compress Text Feed to BinaryThis example receives incoming text data in chunks, compresses as a stream, and accumulates the compressed binary data. The purpose is to demonstrate the BeginCompressString, MoreCompressString, and EndCompressString methods.
' This example assumes the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. Dim success As Boolean Dim compressedData As New Chilkat.BinData Dim compressedBytes() As Byte Dim compress As New Chilkat.Compression compress.Algorithm = "deflate" compress.Charset = "utf-8" Dim sbIndex As New Chilkat.StringBuilder Dim i As Integer 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() sbIndex.AppendInt(i) If (i = 0) Then compressedBytes = compress.BeginCompressString(sbIndex.GetAsString()) Else compressedBytes = compress.MoreCompressString(sbIndex.GetAsString()) End If compressedData.AppendBinary(compressedBytes) compressedBytes = compress.MoreCompressString(": This is a line of data to be compressed..." & vbCrLf) compressedData.AppendBinary(compressedBytes) Next ' Flush any remaining output. compressedBytes = compress.EndCompressString() compressedData.AppendBinary(compressedBytes) ' Show the compressed data in hex format: Debug.WriteLine("The hex encoded compressed text:") Debug.WriteLine(compressedData.GetEncoded("hex")) ' Now decompress in one call: compressedBytes = compressedData.GetBinary() Dim originalText As String = compress.DecompressString(compressedBytes) Debug.WriteLine(originalText) |
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