(PureBasic) Deflate File

Demonstrates how to use the Deflate compression algorithm to compress a file. (The deflate compression algorithm is the most commonly used in the Zip archive file format.)

This code is capable of compressing any size file because the file data is compressed from input to output in a streaming mode. The output file contains only the deflated data (it is not a .zip, and there is no file structure or format).

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkCompression.pb"

Procedure ChilkatExample()

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

    compress.i = CkCompression::ckCreate()
    If compress.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkCompression::setCkAlgorithm(compress, "deflate")

    ; Deflate this XML file:
    success.i = CkCompression::ckCompressFile(compress,"hamlet.xml","hamletDeflate.dat")
    If success <> 1
        Debug CkCompression::ckLastErrorText(compress)
        CkCompression::ckDispose(compress)
        ProcedureReturn
    EndIf

    ; Inflate back to the original:
    success = CkCompression::ckDecompressFile(compress,"hamletDeflate.dat","hamletInflated.xml")
    If success <> 1
        Debug CkCompression::ckLastErrorText(compress)
        CkCompression::ckDispose(compress)
        ProcedureReturn
    EndIf

    Debug "Success!"


    CkCompression::ckDispose(compress)


    ProcedureReturn
EndProcedure