(Visual FoxPro) 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 Chilkat Compression ActiveX

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
    ? loCompress.LastErrorText
    QUIT
ENDIF

loCompress.Algorithm = "deflate"

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

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

? "Success!"