Abbrevia package compression issue

Posted on 2010-08-29
Medium Priority
Last Modified: 2012-05-10
Hi all.
I'm writing a program in Delphi 7 to backup some files in a compressed file. Files resides in several folders. Sometimes it's needed to compress a entire folder and its subfolders, other times files need to be compressed one by one because thery are in different folders.
To do it, I use Abbrevia components. The problem is that the process it takes a long time: each file processes 3 seconds, even if it is very small. The processor runs with some percent performance but there are lots of harddisk accesses. It seems files are not read in a block nor used as a stream.

My question is: how can I improve backup performances? Can I still use Abbrevia components with some setting taht I now ignore? Or do I have to switch to another components? And how I can use blocks or stream to compress files that are in different folders or recurse folders and subfolders?

Thanks in advance.
Question by:Marco Gasi
  • 2
LVL 13

Accepted Solution

aflarin earned 500 total points
ID: 33553645
I suggest you to try other components/libraries like KaZip or JclCompression from JCL and compare their results with Abbrevia components.

I'm using JclCompress with 7zip library and it's fast enough

Assisted Solution

sirodcar earned 500 total points
ID: 33576157
I am using JEDI's JCLCompression .. it is good.. and can be used for compressing single file , gorup of file or folder  or entire folder tree. I would suggest you go with  JEDI's JCLCompression

LVL 31

Author Comment

by:Marco Gasi
ID: 33576239
Hi. Thanks all for answers. Do you know if I can find some JCLCompression usage example? I don't find it within Jedi demos...
LVL 31

Author Closing Comment

by:Marco Gasi
ID: 33978044
Thanks for help, but it has not been complete: at my last request of some code sample nobody answered nothing. I have some doubt that none expert is able to provide an example on how  use jclCompression to compress recursively a folder, or at least a single file.

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