Xojo Plugin

Transition from BeginCompressStringENC to FirstChunk/LastChunk

Provides instructions for replacing deprecated BeginCompressStringENC method calls with using FirstChunk/LastChunk properties. Xojo Plugin

Dim success As Boolean
success = False

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

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

// ----------------------------------------------------------------------------------
// This is the deprecated way of compressing in chunks using Begin/More/End methods..
// ----------------------------------------------------------------------------------
Dim i As Int32
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..." + EndOfLine.Windows))
Next

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

System.DebugLog("The base64 encoded compressed text:")
System.DebugLog(sbCompressedBase64.GetAsString())

// Decompress in one call:
Dim originalText As String
originalText = compress.DecompressStringENC(sbCompressedBase64.GetAsString())
System.DebugLog(originalText)

// ----------------------------------------------------------------------------------
// This is new way of compressing in chunks using FirstChunk and LastChunk properties
// ----------------------------------------------------------------------------------

sbCompressedBase64.Clear 

compress.FirstChunk = True
compress.LastChunk = False

Dim bdCompressed As New Chilkat.BinData
Dim sbUncompressedChunk As New Chilkat.StringBuilder

For i = 0 To 24
    If (i = 24) Then
        compress.LastChunk = True
    End If

    sbUncompressedChunk.Clear 
    success = sbUncompressedChunk.AppendInt(i)
    success = sbUncompressedChunk.Append(": This is a line of data to be compressed..." + EndOfLine.Windows)

    success = compress.CompressSb(sbUncompressedChunk,bdCompressed)

    compress.FirstChunk = False
Next

System.DebugLog("The base64 encoded compressed text:")
System.DebugLog(bdCompressed.GetEncoded("base64"))

// Decompress in one call:
originalText = compress.DecompressStringENC(bdCompressed.GetEncoded("base64"))
System.DebugLog(originalText)