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The Latest

Line Numbers Missing From Stack Trace

You may have seen “(Compiled Code)” in a stack trace and wondered why a line number was not displayed instead. This occurs because as of release 1.1.5 of the Java

Make the Ants March

To implement a quick and easy version of the old “marching ants” line around a control, place two CommandButtons, a Shape, and a Timer control on a form. Then insert

Using an Associative Array

An associative array (also called map or dictionary) is an array for which the index does not have to be an integer. An associative array stores pairs of values. One

Implement a ListView ItemDoubleClick Event

Double-clicking an icon or file name in Explorer is the standard way of launching an application in Windows. However, if you’re developing an app that uses the ListView control from

Ensure Foolproof Data Entry Times

Asking users to enter time values can often lead to problems formatting what the user enters. I use this piece of code to create a drop-down list of hours, minutes,

Use Custom Form Properties

You can easily find out whether your user clicked on OK or on Cancel on a modal dialog. This example also prevents the user from unloading the form, and thereby

Keep Your Clustered Index’s Weight Down

In SQL Server 7, a significant change was made to the way nonclustered indexes work when a clustered index exists on a table. In version 6.5, the nonclustered index used

Prevent Browsers From Caching ASP Pages

Whenever you are programming in Active Server Pages, make sure that your browser is set to check for a new page every time. Otherwise, you may not see your latest

Stream Unique Identifiers

While attempting to deserialize (or unmarshal) a serialized object instance, you may generate an exception with a message similar to: java.rmi.UnmarshalException: Error unmarshaling return; nested exception is: java.io.InvalidClassException: RMIParm; Local

What’s in Name Mangling?

Name mangling, (the more politically correct term is name-decoration, although it is rarely used) is a method used by a C++ compiler to generate unique names for identifiers in a

Do You Know What Your Identity Is?

Everyone by now is familiar with how to create auto increment keys in SQL Server–just define an integer column with identity (start,increment) and you are set. To create a new

Primary Key Should Not be Clustered

By default, when you define a primary key in the create table statement, it uses a clustered index. However, a clustered key is best used to support queries that return

Debug Problems in Your GridBagLayout Code

The GridBagLayout is a flexible layout manager, but is also notoriously difficult to use. Some of the most common and difficult to debug problems occur when the amount of space

Use Full-Screen Mode in Visual InterDev 6

Giving yourself enough elbow room to design Web pages can be difficult inside the Visual InterDev environment. However, there’s a little-known feature that greatly expands your screen real estate. Full

Uses of Reverse Iterators

Reverse iterators are ordinary iterators except that they invert the semantic of the overloaded ++ and — operators. They are useful when the elements of a container are accessed in

JavaScript Include Files?

Question: I have JavaScript functions that I’m using in different pages. Is there a way to do a C/C++ type include so I don’t have to replicate the JavaScript code

Optimize SQL Using “Show Statistics”

The new and improved showplan in SQL 7 is certainly prettier and easier to understand than the previous version. However, a better method of focusing on trouble spots is using

Redirect System.out and System.err

A crude but common way of debugging Java programs is to use the public System.out and/or System.err instances of PrintStream to display information: System.out.println(“Entering section A of my code”); One

The Role of Sequence Adaptors

A sequence adaptor is a container built upon another container that modifies its interface. For example, the container stack is usually implemented as a deque, whose non-stack operations are hidden.

Provide Alternate Text for Images in FrontPage 98

The drag and drop convenience of Microsoft FrontPage 98 makes you more efficient but leaves some unprofessional touches to Web pages. For instance, when you drop an image into the

std::string and Reference Counting

The Standard’s specification of class std::string is formulated to allow a reference counted implementation. However, this is not a requirement. A reference counted implementation must have the same semantics as

Which Class is Returned by getClass()?

When a class is instantiated, the subsequent object is actually an instance of the most derived class in the class hierarchy. A point of confusion for some programmers is that

Dumping to a Remote Drive

For SQL Server to perform a dump to a remote drive (that is, another machine on the network), the ID that SQL Server runs under must have rights to the

Restore Visual InterDev 6 Environment With a Click

When you are working in Visual InterDev 6, it is sometimes handy to reposition the Project Explorer, Toolbox, and Properties windows as floating windows. However, docking the windows again can

Datawidowchild problems

Question: I have a datawindow d_case with a retrieval argument al_case_id. In this datawindow, I have two columns that are ddlbcolumn1 = judge with dddw_judge and column2 = contact with

VB – Scripting Host

Question: What am I missing? I can’t compile this: Private Sub Form_Load()Dim WshNetworkSet WshNetwork = Wscript.CreateObject(“Wscript.Network”)’ Local name mapped to remote share WshNetwork.MapNetworkDrive “Z:”, “\NTc$”end sub Answer: Just leave off

Active Partitions Under NT with VB6

Question: I have to tell you, you solved a problem for me (rebooting NT from VB), which I’ve been trying to figure out for months. Much thanks. Now I can

OpenUserobject on a tab control

Question: I am trying to use OpenUserObjectWithParm to dynamically open a datawindow on a tab page on a tab. All the objects are pfc descendents. I want to open one