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DataFlex Examples

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(DataFlex) Compress Bytes to Base64 (or any other encoding)

Compresses bytes to base64 or any other encoding. Also decompress to return the original.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoBinData
    Integer i
    Handle hoCompress
    Variant hoUncompressedBytes
    String sCompressedBase64
    String sCompressedHex
    Handle hoBinData2
    String sTemp1

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

    // First create some binary data to compress.
    Get Create (RefClass(cComChilkatBinData)) To hoBinData
    If (Not(IsComObjectCreated(hoBinData))) Begin
        Send CreateComObject of hoBinData
    End

    For i From 1 To 16
        Get ComAppendEncoded Of hoBinData "000102030405060708090A0B0C0D0E0F" "hex" To iSuccess
    Loop

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

    Get ComGetBinary Of hoBinData To hoUncompressedBytes

    // Compress and return the compressed bytes in base64 format.
    Get ComCompressBytesENC Of hoCompress vUncompressedBytes To sCompressedBase64
    Showln "compressed and base64 encoded: " sCompressedBase64

    // Compress and return in hex format:
    Set ComEncodingMode Of hoCompress To "hex"
    Get ComCompressBytesENC Of hoCompress vUncompressedBytes To sCompressedHex
    Showln "compressed and hex encoded: " sCompressedHex

    // Now decompress..
    Get Create (RefClass(cComChilkatBinData)) To hoBinData2
    If (Not(IsComObjectCreated(hoBinData2))) Begin
        Send CreateComObject of hoBinData2
    End

    // Decompress the base64..
    Set ComEncodingMode Of hoCompress To "base64"
    Get ComDecompressBytesENC Of hoCompress sCompressedBase64 To hoUncompressedBytes
    Get ComAppendBinary Of hoBinData2 vUncompressedBytes To iSuccess
    // Show the uncompressed bytes in hex format:
    Get ComGetEncoded Of hoBinData2 "hex" To sTemp1
    Showln sTemp1
    Showln "--"

    // Decompress the hex..
    Set ComEncodingMode Of hoCompress To "hex"
    Get ComDecompressBytesENC Of hoCompress sCompressedHex To hoUncompressedBytes
    Get ComClear Of hoBinData2 To iSuccess
    Get ComAppendBinary Of hoBinData2 vUncompressedBytes To iSuccess
    // Show the uncompressed bytes in hex format:
    Get ComGetEncoded Of hoBinData2 "hex" To sTemp1
    Showln sTemp1
    Showln "--"


End_Procedure

 

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