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DataFlex Examples

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(DataFlex) Compress and Decompress a String

Demonstrates how to compress and decompress a string.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoSb
    Integer i
    Handle hoCompress
    Variant hoCompressedBytes
    String sCompressedBase64
    String sDecompressedString
    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 hoSb
    If (Not(IsComObjectCreated(hoSb))) Begin
        Send CreateComObject of hoSb
    End

    For i From 1 To 20
        Get ComAppend Of hoSb "This is the original uncompressed string." + (character(13)) + (character(10)) 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"
    // Indicate that the utf-8 byte representation of the string should be compressed.
    Set ComCharset Of hoCompress To "utf-8"

    Get ComGetAsString Of hoSb To sTemp1
    Get ComCompressString Of hoCompress sTemp1 To hoCompressedBytes

    // If the compressed data is desired in string format, then get the base64 representation of the bytes.
    Set ComEncodingMode Of hoCompress To "base64"
    Get ComGetAsString Of hoSb To sTemp1
    Get ComCompressStringENC Of hoCompress sTemp1 To sCompressedBase64
    Showln "Compressed Bytes as Base64: " sCompressedBase64

    // Now decompress...
    Get ComDecompressString Of hoCompress vCompressedBytes To sDecompressedString
    Showln "The original string after decompressing from binary compressed data:"
    Showln sDecompressedString

    // To decompress from Base64...
    Set ComEncodingMode Of hoCompress To "base64"
    Get ComDecompressStringENC Of hoCompress sCompressedBase64 To sDecompressedString
    Showln "The original string after decompressing from Base64:"
    Showln sDecompressedString


End_Procedure

 

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