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).

Download the Chilkat Compression ActiveX here: ChilkatCompression.zip
Unzip and register the DLL with regsvr32. (This is a pre-release)

LOCAL loCompress
LOCAL lnSuccess

loCompress = CreateObject('Chilkat.Compression')

*  Any string argument automatically begins a 30-day trial.

lnSuccess = loCompress.UnlockComponent("30-day trial")
IF (lnSuccess <> 1) THEN
    =MESSAGEBOX("Compression component unlock failed")
    QUIT
ENDIF

loCompress.Algorithm = "deflate"

*  Deflate this XML file:
lnSuccess = loCompress.CompressFile("hamlet.xml","hamletDeflate.dat")
IF (lnSuccess <> 1) THEN
    =MESSAGEBOX(loCompress.LastErrorText)
    QUIT
ENDIF

*  Inflate back to the original:
lnSuccess = loCompress.DecompressFile("hamletDeflate.dat","hamletInflated.xml")
IF (lnSuccess <> 1) THEN
    =MESSAGEBOX(loCompress.LastErrorText)
    QUIT
ENDIF

? "Success!"