Skip to main content

What will you do with VFPCompression ?

Craig Boyd has posted about his Visual FoxPro VFPCompression library, a tool that lets developers programmatically zip and unzip files.

While many may immediately see the benefit of using this approach for aiding in backing up files, there's another use that may not be immediately obvious.

Zipped documents for backup are nothing new but file formats that are actually zip files with multiple documents are becoming more popular. MindJet's MindManager has used a Zipped file format since 2005 (maybe even earlier) and Office 2007 will also be using this approach.

Essentially what it means is that a Word Document (.docx extension) can be renamed to ZIP and decompressed. Inside the zip file are all of the pieces required to define the Word document. You can also use Word to open other file formats as well. Read the walkthrough to get a better understanding.

But how can you use this new approach in your FoxPro development? Well, thanks to the VFPCompression FLL, dealing with the individual zip portion becomes a lot easier so now we can think of uses in applications:

1) static lists or rarely updated files can now be stored in zip files, only being compressed or decompressed on application startup.
2) memo field usage can be reduced by storing the values in a stream that is then compressed (thus, avoiding memo field bloat)
3) application core data can be backed up on startup and shutdown, ensuring reliable backups stored elsewhere
4) updates can be packaged or sent to users and automatically unbundled
5) error logs can be compressed
6) application data can be stored in a single "file format" making it easier for applications to copy data around

Do you plan on taking advantage of this method of storing data? If so, how?


Craig Boyd said…
Thanks for the plug for the VFP Compression FLL. Great blog entry Andrew that should get dev's thinking about the many ways this library can be put to good use.
Ted Roche said…
From 2004 and posted at

"'s native document format is a compressed XML format. Unlike other proprietary office document packages, this format is openly documented. Open any document with a ZIP viewer, such as WinZIP, and you'll see a set of XML documents. These documents can be disassembled and reassembled to create new documents."

The newer 2.0 format, ODF, is a well-documented and international standard.

Andrew MacNeill said…
Thanks Ted - good point about

Popular posts from this blog

Well, that explains CodePlex...

In a move that will be sure to anger open source (or rather anti-paid software, anti-Microsoft open source)  zealots, Microsoft is planning to buy GitHub . A year ago, I mused about why Microsoft would shut down CodePlex and how the world needs competing source code repositories to be strong. I'm not the only one per this Slashdot article  : "...   people have warned about GitHub becoming as large as it did as problematic because it concentrates too much of the power to make or break the open source world in a single entity, moreso because there were valid questions about GitHubs financial viability...." - Jacques Mattheij I will be interested in seeing this play out - whether developers jump ship or not. Have all the efforts Microsoft has made in pushing towards open source be seen as genuine or will all the zealots jump ship or maybe even attack? Microsoft's comment about why they shut down CodePlex referred to how spammers were using CodePlex. Well, GitHub

Attending Southwest Fox 2019 could change your life - Find out how

Southwest Fox is coming up in October and as I do every year, I spoke with the organizers Rick , Doug and Tamar on the FoxShow. Deadlines for Southwest Fox: Super-saver price (before July 1): $695 Early-bird price (before August 1): $770 Regular price (August 1 and later): $820 This year, I took a different approach with separate shows for each organizer but the main message is still the same : July 1st is their Go/No-Go date. Conferences don't talk about this very often. I don't think developers really question if Apple will hold their WWDC in June or Microsoft will hold their Build conference - but that's because those conferences are vendor-led. Southwest Fox is a community-driven conference - it's not driven by a company with an agenda. Listen to the interviews and you can hear how important each of the organizers feel the live connection between speakers and among attendees.

FoxInCloud Stats

FoxInCloud sent this link a while back about their statistics regarding visits to their site: What's interesting here is the breakdown of people. Yes, I think it's understandable that the Fox community is getting older. Another factor is the growth of the mobile and web environments taking over development. These environments really do push people towards the newer non-SQL or free SQL/hosted environments but more towards hosted storage options like Amazon and Google. A tool like FoxInCloud that helps MOVE existing applications to the cloud inherently competes with those environments. But FoxInCloud also allows developers to extend their application further by giving them a starting point using Javascript and the basic CSS (such as Bootstrap). If you're not rebuilding your application from scratch, it's certainly a great step forward. FoxPro VFP