(DataFlex) 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 ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoSbCompressedBase64
    Handle hoCompress
    Handle hoSbIndex
    Integer i
    String sOriginalText
    String sTemp1

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

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbCompressedBase64
    If (Not(IsComObjectCreated(hoSbCompressedBase64))) Begin
        Send CreateComObject of hoSbCompressedBase64
    End

    Get Create (RefClass(cComChilkatCompression)) To hoCompress
    If (Not(IsComObjectCreated(hoCompress))) Begin
        Send CreateComObject of hoCompress
    End
    Set ComAlgorithm Of hoCompress To "deflate"
    Set ComCharset Of hoCompress To "utf-8"
    Set ComEncodingMode Of hoCompress To "base64"

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbIndex
    If (Not(IsComObjectCreated(hoSbIndex))) Begin
        Send CreateComObject of hoSbIndex
    End

    For i From 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.
        Send ComClear To hoSbIndex
        Get ComAppendInt Of hoSbIndex i To iSuccess
        If (i = 0) Begin
            Get ComBeginCompressStringENC Of hoCompress (ComGetAsString(hoSbIndex)) To sTemp1
            Get ComAppend Of hoSbCompressedBase64 sTemp1 To iSuccess
        End
        Else Begin
            Get ComMoreCompressStringENC Of hoCompress (ComGetAsString(hoSbIndex)) To sTemp1
            Get ComAppend Of hoSbCompressedBase64 sTemp1 To iSuccess
        End

        Get ComMoreCompressStringENC Of hoCompress ": This is a line of data to be compressed..." + (character(13)) + (character(10)) To sTemp1
        Get ComAppend Of hoSbCompressedBase64 sTemp1 To iSuccess
    Loop

    // Flush any remaining output.
    Get ComEndCompressStringENC Of hoCompress To sTemp1
    Get ComAppend Of hoSbCompressedBase64 sTemp1 To iSuccess

    Showln "The base64 encoded compressed text:"
    Get ComGetAsString Of hoSbCompressedBase64 To sTemp1
    Showln sTemp1

    // Now decompress in one call:
    Get ComGetAsString Of hoSbCompressedBase64 To sTemp1
    Get ComDecompressStringENC Of hoCompress sTemp1 To sOriginalText
    Showln sOriginalText


End_Procedure