(VB.NET UWP/WinRT) 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 Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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

Dim success As Boolean
Dim sbCompressedBase64 As New Chilkat.StringBuilder

Dim compress As New Chilkat.Compression
compress.Algorithm = "deflate"
compress.Charset = "utf-8"
compress.EncodingMode = "base64"

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
        sbCompressedBase64.Append(Await compress.BeginCompressStringENCAsync(sbIndex.GetAsString()))
    Else
        sbCompressedBase64.Append(Await compress.MoreCompressStringENCAsync(sbIndex.GetAsString()))
    End If

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

' Flush any remaining output.
sbCompressedBase64.Append(Await compress.EndCompressStringENCAsync())

Debug.WriteLine("The base64 encoded compressed text:")
Debug.WriteLine(sbCompressedBase64.GetAsString())


' Now decompress in one call:
Dim originalText As String = Await compress.DecompressStringENCAsync(sbCompressedBase64.GetAsString())
Debug.WriteLine(originalText)