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News & Press Releases

Bill Gates Retires! On Friday, June 27, 2008, Bill Gates retired from Microsoft. Mostly. Posted 6/28/2008 by mprestwood	Samsung Will Ship a 256GB Solid State Drive This Year! Many industry experts predict sold state drives will replace disc-based hard drives. Posted 5/26/2008 by mprestwood
eMag Archives Now Available to All Now non-members can view the eMag archives and members are no longer limited to the eMags you've received. Posted 5/26/2008 by mprestwood	New DevExpress Updates Now Available List of releases available as part of the newest update of Express Install, v1.36. Posted 5/26/2008 by mprestwood
WPO X4 Ships! Paradox Still Does Not Support Vista! According to current information on the official Corel X4 home page, WPO X4 ships with Paradox 11 SP2 and stil... Posted 5/15/2008 by mprestwood	Delphi Acquired by Embarcadero Technologies CodeGear, Borland's development tools division is being acquired by Embarcadero Technologies. Posted 5/9/2008 by mprestwood
Embarcadero Technologies To Acquire CodeGear Borland no longer owns Delphi, C++Builder, JBuilder, Interbase, etc. Posted 5/7/2008 by Wes	C++Builder Acquired by Embarcadero Technologies CodeGear, Borland's development tools division is being acquired by Embarcadero Technologies. Posted 5/7/2008 by Wes
Download VS.Net 2008 90-Day Trial Download the free Visual Studio.Net 2008 90-day trial edition. Posted 5/1/2008 by mprestwood	Visual FoxPro 9.0 SP2 Help Download The help file for VFP 9.0 SP2 is now available for download. This is in addition to the online help documentat... Posted 4/28/2008 by mprestwood

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Configure, open and read serial port using OPAL?
Posted Fri@17:03 EST, Updated Fri@17:03 EST

pronegot

Paradox Third Party Software, DLLs, and Controls

working with Paradox since 1994,Semi new
Posted Thu@18:45 EST, Updated Thu@22:10 EST

mjharry

mprestwood

Practice Topic

Steal someones php code or settings?
Posted 6/27/2008, Updated 6/27/2008

S 0 n Y

mprestwood

PHP

Acess 2003 basic report question...
Posted 6/24/2008, Updated 6/26/2008

gsempcb

nashwannabe7

MS Access Interactive

Form questions...
Posted 6/24/2008, Updated 6/25/2008

gsempcb

nashwannabe7

MS Access Interactive

class that should not be inherited.
Posted 6/24/2008, Updated 6/25/2008

Alagu_Sundari

mprestwood

C++Builder

Stuck, in Access 2003...
Posted 6/5/2008, Updated 6/23/2008

gsempcb

nashwannabe7

MS Access Interactive

325

Word Ducument
Posted 4/12/2006, Updated 6/21/2008

Paul Castelow

dfought

ObjectPAL

276

How to flow Diagram an existing Perl script
Posted 6/17/2008, Updated 6/20/2008

kmsvge

mprestwood

Perl

109

Hello every body, new join
Posted 6/18/2008, Updated 6/20/2008

r_ramesh

mprestwood

Member Introductions

148

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Counters

Tip

1. Don't Use Size=1 or Font-Size=xx-small

Tip: Do not use the smallest standard font size of "1" and "xx-small" for any text you actually want a visitor to read. The smallest font size should be reserved for text you don't care if the visitor reads like the copyright notice at the bottom of the page.

+Add Comment (0 Comments )

Mike Prestwood

Artistic (Design, Layout, Graphics, etc.)

Website Design & Hosting

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FAQ
Flashcard

2. Virual; Abstract; vs. Dynamic; Abstract;

Question: Why do I have to specify virtual when creating an abstract method? Why not just abstract?

+Add Comment (2 Comments last by mprestwood )

Mike Prestwood

OOP

Delphi for Win32

All: 43
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Definition
Flashcard

3. Aggregation

Short Definition: Aggregations indicate a whole-part relationship, and are known as "has-a" or "is part of" relationships. An Aggregation relationship is indicated by a line with a hollow diamond.

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Mike Prestwood

Object Orientation (OO)

Coding & OO

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Definition
Flashcard

4. Association

Short Definition: An Association is a generic relationship between two classes and is represented a line connecting the two classes. This line can be qualified with the type of relationship, and can also feature multiplicity rules such as one-to-one, one-to-many, many-to-many, 0 or 1 to many, etc.

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Mike Prestwood

Unified Modeling Language (UML)

Analysis & UML

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Definition
Flashcard

5. Composition

Short Definition: A composite relationship means that a class cannot exist by itself. It must exist as a member of another class. A composite relationship is indicated by a solid line with a solid diamond head pointing to the part class. Alternatively, you can show this relationship graphically with the part class nested in the whole class.

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Mike Prestwood

Object Orientation (OO)

Coding & OO

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Updated Knowledge Base Articles

KB Article

KB Topic

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Post

1. Using BDE TTables to read or write text file records

How to read or write data from comma-delimeted or fixed length record text files in Borland Delphi.

+Add Comment (1 Comments )

Scott

BDE

Delphi for Win32

All: 456
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Post

2. Stacks in Java

Provides the definition of a stack and an example of its implementation in Java

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Stephen Berry

Java

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Post

3. Using On Error Resume Next

You can use "On Error Resume Next" to suppress errors and "On Error Goto 0" to stop suppressing errors.

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Mike Prestwood

Coding Tasks

ASP Classic

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Article

4. Introduction to OO for the Paradox Community

Compromise OO implementation strategies for Paradox developers.

+Add Comment (4 Comments last by mprestwood )

Mike Prestwood

OPAL: Wicked Coding Tasks

Corel Paradox

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Post

5. Install Paradox 9 on Vista

Instructions to install Paradox 9 for Windows on Vista.

+Add Comment (1 Comments last by Mamacita )

Mike Prestwood

1-General, Installation, Setup, & BDE

Corel Paradox

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New KB Comments

Comments added to KB articles. View More

Mike Prestwood
Prestwood Software

PS Staff

Moderator

Rank: Fleet Admiral

Joined: Oct 2000
Visits: 21312
MB Posts: 965
KB Articles: 839
Location: Citrus Heights, CA USA

Wednesday, July 02, 2008 (Updated 7/2/2008 11:13:22 AM)

Read | +Add Comment

Hi Graham,

>>...customer in a Customer table and orders would be in an Orders table?

Yes customers in customer table and orders in the orders table as usual.

>>...how many orders have been placed by a specific Customer belong in the Customer library (class) or in an Orders library?

Since Number of Orders is a property of a customer, I would put that property in the Customer class but you are correct that that custom method would indeed count the values from the orders table. It uses the orders.db table. Although classes frequently map 1 to 1 to tables in a database, when creating reusable code, you need to switch your thinking. You need to switch from a data-centric view to an object-centric view.

>>Or would you have a method in Customer.lib which called a method in Orders.lib?

If I wanted the ability to retrieve the number of orders of a customer in the Orders class, sure, you could design it that way. And yes, you could use aggregation where the Customer class "has a" orders object in it. In ObjectPAL, you would have to simply make use of an Orders.lib custom method.

Aggregation vs. Composition

Regarding...
Introduction to OO for the Paradox Community

Compromise OO implementation strategies for Paradox developers.

Graham Farquhar

Rank: Cadet 3rd Year

Joined: Jun 2005
MB Articles: 0
KB Articles: 0
Location: Newark, UNK UK

Wednesday, July 02, 2008

Read | +Add Comment

Interesting article.

I feel the example based on interrogating the 'Customer' table to find out how many orders have been placed somewhat dubious in terms of database design - surely you would only have one record per customer in a Customer table and orders would be in an Orders table?

As far as OO design goes would a method to find out how many orders have been placed by a specific Customer belong in the Customer library (class) or in an Orders library? Or would you have a method in Customer.lib which called a method in Orders.lib?

Regarding...
Introduction to OO for the Paradox Community

Compromise OO implementation strategies for Paradox developers.

Mamacita

Rank: Cadet 3rd Year

Joined: Feb 2001
MB Posts: 1
KB Articles: 0
Location: Milpitas, CA USA

Tuesday, July 01, 2008

Read | +Add Comment

Well Played.

mOM

Regarding...
Install Paradox 9 on Vista

Instructions to install Paradox 9 for Windows on Vista.

Mike Prestwood
Prestwood Software

PS Staff

Moderator

Rank: Fleet Admiral

Joined: Oct 2000
Visits: 21312
MB Posts: 965
KB Articles: 839
Location: Citrus Heights, CA USA

Tuesday, July 01, 2008

Read | +Add Comment

Also of note...

In Delphi for .Net, there is no difference between virtual and dynamic.

Regarding...
Virual; Abstract; vs. Dynamic; Abstract;

Why do I have to specify virtual when creating an abstract method? Why not just abstract?

Mike Prestwood
Prestwood Software

PS Staff

Moderator

Rank: Fleet Admiral

Joined: Oct 2000
Visits: 21312
MB Posts: 965
KB Articles: 839
Location: Citrus Heights, CA USA

Tuesday, July 01, 2008 (Updated 7/1/2008 5:34:05 PM)

Read | +Add Comment

Here is the syntax in question:

function Age: Integer; Abstract; //Does not work.

The above returns the following error:

[Pascal Error] poc_ClassTestsUnit1.pas(23): E2167 Abstract methods must be virtual or dynamic

Here is the correct syntax:

function Age: Integer; Virtual; Abstract; //Optimized for speed and most common.

function Age: Integer; Dynamic; Abstract; //Optimized for size.

For example, here is a complete simple class example:

  TMyClass = class(TObject)
  private
    function Name: String;
  public
    function Age: Integer; Abstract;
  end;

Then in a descendent class, you implement it:

//Class declaration...

TMyClass2 = class(TMyClass)

public

  function Age: Integer;

end;

//Method implementation...

function TMyClass2.Age: Integer;
begin
  Age := 12;
end;

Regarding...
Virual; Abstract; vs. Dynamic; Abstract;

Why do I have to specify virtual when creating an abstract method? Why not just abstract?

New Member Blog Entries

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Title

Updated

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Group

Mike Prestwood
Prestwood Software

PS Staff

Moderator

Rank: Fleet Admiral

Joined: Oct 2005
Visits: 21312
MB Posts: 965
KB Articles: 839
Location: Citrus Heights, CA USA

The Future of Paradox Blog

Authored by , Posted By mprestwood
If you're still using Paradox for any of your business database applications, you need to put a plan together now for converting to another development tool or at least understand what the future is likely to hold. If you're a power-user or researcher working with data, stick with Paradox at least for now.

+Add Blog Entry (21 Entries last by mprestwood )

6/19/2008

0-Paradox Presales & Info

Corel Paradox

Mike Prestwood
Prestwood Software

PS Staff

Moderator

Rank: Fleet Admiral

Joined: Mar 2003
Visits: 21312
MB Posts: 965
KB Articles: 839
Location: Citrus Heights, CA USA

Is Paradox a good Internet solution?

Authored by , Posted By mprestwood
My thoughts on whether Paradox for Windows is a good solution for building web-based Internet solutions.

+Add Blog Entry (3 Entries last by mprestwood )

6/17/2008

0-Paradox Presales & Info

Corel Paradox

Wes Peterson
Prestwood Software

PS Staff

Moderator

Rank: Commander

Joined: Jan 2008
Visits: 699
MB Posts: 66
KB Articles: 96
Location: Citrus Heights, CA USA

Windows XP Not Supported After June 30, 2008

Authored by , Posted By Wes
Microsoft plans to discontinue sales of Windows XP on June 30, 2008. Because XP is a tried and true OS, and because of numerous problems with Vista, many users and IT departments would prefer to stick with XP. InfoWorld has an initiative to keep XP alive indefinitely. You can help.

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5/4/2008

IT Water-Cooler for Power-Users

Industry News & Trends

Wes Peterson
Prestwood Software

PS Staff

Moderator

Rank: Commander

Joined: Jan 2008
Visits: 699
MB Posts: 66
KB Articles: 96
Location: Citrus Heights, CA USA

Failed Hard Drives and RAID

Authored by , Posted By Wes
If you've used computers for more than a few years, you know that you don't wonder IF a hard drive will fail - you wonder WHEN. It just happened to me - again. But this time it looks like the results will be pretty painless. The reasons? * RAID Level 1 * Superb Hard Drive manufacturer warranty support

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1/24/2008

Non-Removable Storage Technology

Net Admin Hardware & Software

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