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The Latest

Hunt for Developers

Want to see a list of the developers who worked on VB5 and VB6? Try this: From VB’s View menu, select Toolbars, then Customize…. In the resulting dialog, click on

Keypress Won’t Fire When Pasting Into Text Box

Don’t put rules for validating text values or formats in the KeyPress event-use the Change event instead. If you “paste” into a text box, the KeyPress event isn’t fired and

Fast Copy of Properties between Controls

You probably already know that if you select multiple controls on a form you can use the Property Window to change one of their common property in one single operation.

Retrieve the list of SQL Server stored procedure

You can query SQL Server system tables to retrieve the list of all the stored procedure that are available for the end user and applications. The following routine extract their

Correctly restore mouse cursor

When you write lengthy procedures, it is a good habit to change the mouse cursor to an hourglass, and restore it to the original shape when the procedure exits. However,

The “Assume No Aliasing” compiler option

A procedure is said to contain aliased values if it can refer to the same memory addresses in two or more distinct ways. A typical example is the following procedure:

Vector vs. Array–the Best of Both Worlds

It’s often pointed out that the Vector class is expensive to use because all of the methods are synchronized. Java 2 has the LinkedList class, which can serve the same

Modifying Layout on Multiple Platforms

You can use the Toolkit’s getScreenSize().width to recompute the size of a component at run time. For example, if you have a Frame that is supposed to have the screen’s

Using NULL in a Query’s Where Clause

While comparing a field to NULL, a SQL query should use the IS operator in place of the “=” operator. The reason is that if the ANSI_NULLS option is On

The Order of Destructors’ Call

An object’s destructor invokes the destructors of its direct base classes and member objects. The invocation occurs in the reverse order of the construction of the subobjects. Note, however, that

Use Namespaces to Facilitate Software Version Control

Successful software projects do not end with the product’s rollout. In most projects, new versions that are based on their predecessors are periodically released. Moreover, previous versions have to be

Be Careful With Initializers in Constructors

You should use caution when automatically initializing class variables. In this example, C1 calls setVal() in its constructor, and C2, a subclass of C1, overrides the method to set a

Working With Collections

When working with collections, use an error handler to easily determine if a given key exists in the collection. If you try to access an item from a collection where

N.T. 4 Conversion

Question: Is there a painless way of converting a Novell 4.1 server to N.T. 4 without just performing a total rebuild? There are no applications running from the server but

OLE Commands for Powerbuilder to Word/Excel

Question: I was wondering if there is a list available somewhere of all the commands with their syntax for OLE? I want to manipulate Word and Excel from inside Powerbuilder

Accessing 2 or More Databases

Question: How do I access more than one database (e.g., Oracle and Access) via a Powerbuilder application? I currently have ODBC drivers for both databases, but cannot access the required

NT Scheduling

Question: How do I schedule to run my Exe automatically?When I schedule it, the exe does not run. Answer: First, for Command Scheduler to work consistently, the Schedule service must

Counting Time

Question: How can I count how long an application is used? Answer: You can use two time variables for this. Use the first variable to record the start time, then

PowerBuilder 6.5 and MS Word 97 Example

Question: Do you have any examples of calling MS Word Visual Basic to open, modify, print and close a document (i.e., calling macros, inserting tables)? Answer: Here is an example

Running NT Server 4.0 with Service Pack 4

Question: I have a question about running NT Server 4.0 with Service Pack 4. On start-up, I’m getting an error in my event log: Source: Server Control Manager, EventID 7023,

Use the Intern Method to Achieve String Equality

String comparison doesn’t work for variables. In fact, only variables referencing the same string will work. The String class has an intern method, which lets you compare two variables. This

Compound member attributes

The Procedure Attributes dialog includes a Procedure ID combo box, that lets you associate a particular ID to a given member of the class. You usually use this combo to

Retrieve the currency symbol

It is very simple to retrieve the correct currency symbol, using just plain VBA statements: currSymbol = Trim$(Replace(FormatCurrency(0,0), “0”, “”)) If you can also determine if the symbol precedes or