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(PowerBuilder) Compress and Decompress Hex String

Imagine we have data represented as a hex string. This example demonstrates how to decode, compress, and re-encode to a smaller hex string representing the compressed data. An even better choice is to re-encode to a more compact encoding such as base64.

Note: This example requires Chilkat v9.5.0.66 or greater.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

integer li_rc
integer li_Success
string ls_StrHex
oleobject loo_Compress
oleobject loo_BinDat
string ls_CompressedHex
string ls_CompressedBase64
string ls_DecompressedHex

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

ls_StrHex = "54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A0D0A"

loo_Compress = create oleobject
li_rc = loo_Compress.ConnectToNewObject("Chilkat_9_5_0.Compression")
if li_rc < 0 then
    destroy loo_Compress
    MessageBox("Error","Connecting to COM object failed")
    return
end if
loo_Compress.Algorithm = "deflate"

loo_BinDat = create oleobject
li_rc = loo_BinDat.ConnectToNewObject("Chilkat_9_5_0.BinData")

// Load the hex string into a BinData object.
// This decodes the hexidecimal. The decoded bytes will be contained in the BinData.
loo_BinDat.AppendEncoded(ls_StrHex,"hex")

// Compress the BinData.
loo_Compress.CompressBd(loo_BinDat)

// Get the compressed data in hex format:
ls_CompressedHex = loo_BinDat.GetEncoded("hex")
Write-Debug "compressed hex:"
Write-Debug ls_CompressedHex

// The compressed hex is: 0BC94855282CCD4CCE56482ACA2FCF5348CBAF50C82ACD2D484D51C82F4B2D522801CAE72456552AA4E4A7EBF172850C61E5BC5C00

// Even better, get the compressed data in base64 format:
// (base64url and modbase64 are other valid choices...)
ls_CompressedBase64 = loo_BinDat.GetEncoded("base64")
Write-Debug "compressed base64:"
Write-Debug ls_CompressedBase64

// The compressed base64 is: C8lIVSgszUzOVkgqyi/PU0jLr1DIKs0tSE1RyC9LLVIoAcrnJFZVKqTkp+vxcoUMYeW8XAA=

// Now decompress:
loo_BinDat.Clear()
loo_BinDat.AppendEncoded(ls_CompressedHex,"hex")
loo_Compress.DecompressBd(loo_BinDat)

ls_DecompressedHex = loo_BinDat.GetEncoded("hex")
Write-Debug "decompressed hex:"
Write-Debug ls_DecompressedHex

// The output is the original hex string:
// 54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A0D0A


destroy loo_Compress
destroy loo_BinDat

 

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