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The Latest

DevX - Software Development Resource

Split Strings Cleanly

The Split function is great for parsing strings, but what happens when a string has more than one consecutive delimiter? It might seem odd that Split() returns empty substrings as

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Change the Gray Applet Background

Applets use a default background of gray, which may not be visually appealing to you. Besides, gray may be the background color of the web page on which the applet

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Java Consoles Show What’s Going On With Applets

Modern Java IDEs like Symantec’s Visual Cafe and Inprise’s JBuilder offer advanced applet debugging facilities. However, if you develop your applets using only the freely distributed JDK, it might be

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On Throwing Exceptions From Constructors

It sometimes makes a lot of sense to throw an exceptionfrom the constructor of a class; look at constructors ofthe java.net.URL for an example. But what do we do if

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Paint Outside The GUI Thread

A call to repaint() will schedule a component to be repainted when the gui thread is free. But what if we can’t wait till then? Well, we can use the

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Load an HTML Page From Within an Applet

Applets are executed within a web browser, and there’s an easy way to load show a specific URL. 1. Get a reference to the applet context 2. Call the showDocument

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See Which Fonts Are Installed With Your VM

Sometimes, it is useful to know which fonts are installed. This can differ from one Java Virtual Machine (JVM) implementation to another. The following code displays the names of all

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Get a Hold of the Bits in Your Integers

Sometimes, it is useful to obtain a binary representation of integer, or a character. For example, we might want to represent the character ‘a’ by its binary 01100001, the letter

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Trigonometry With Java

The java.lang.Math package has useful trigonometric functions such as: public static native double sin(double a) public static native double asin(double a). So, if we write code: double x = 90;

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Using ShowHelp with Windows 95 and NT

Question: When we call the ShowHelp function in Windows 95, it works with a topic ID but not with a keyword. However, the same source works just the opposite in

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Swap Images With JavaScript

A nice touch to a Web page is a button that changes appearance when clicked. All you need is two GIFs and a little JavaScript. The following code initially displays

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Stick With Jet 3.51 for Access 97 Databases

It is natural to assume that later versions of software will improve performance and fix bugs. However, you may run into the opposite if you try that with an Access

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Copying Controls From Form to Form

Question: I have a VB application that contains two forms. Form A is a Control Library that contains several Frames, Labels, Text Boxes, and Command buttons. (Note: some of these

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VB Inheritance

Question: I would like some help with implementing inheritance in VB6. Answer: VB, as of the current version doesn’t really support inheritance, all you can do is have one class

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Returning the Last Day of a Month

Question: I have a form from which I am searching a database.The search is being conducted between a startdate and an enddate.As the default I’d like to have the first

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FTP in VB

Question: What’s the best way to transfer a file via FTP in Visual Basic? Answer: This is a simple procedure. All you have to do is use the Microsoft Internet

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No Response from Server: Part I

Question: Our Informix 7.31 TC2 server has had some troubles recently. It worked properly for about four or five hours but then it rejected any request! Users who are already

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Printing a Visual FoxPro Report in Text Mode

Question: My reports are printed in graphic mode. Is there a way to print my reports in text mode? Answer: The REPORT FORM command has a parameter called “ASCII” that

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Data Migration from Informix 4.1

Question: About a year ago we had some data migrated by an outside service from Informix 4.1 to SQL Server 6.5. It appeared at the time that everything went well.

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Creating Folders in an Application

Question: How do I get my application, developed in PowerBuilder 6.0, to manipulate folders in Windows Explorer? I want it to be able to create folders. Answer: PowerBuilder does not

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Using the FileSystemObject in an ASP Page

Question: I am using the FileSystemObject in an ASP page to check if a file exsts using the FileExists method. The problem is that I don’t want to hardcode the

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Automatically Close Popup Window

Question: What can I add to an HTML file presented in a popup window called by a script to automatically close that popup window after so many seconds? I have

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Query is not Updateable Error

Question: When trying to run the SQL statement, I get this error but I don’t know what it means: Microsoft OLE DB Provider for ODBC Drivers error ‘80004005’ [Microsoft][ODBC Microsoft

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Limiting Search Results

Question: When my clients enter searching criteria, I want to limit the number of results. For example, if the number of results is over 100, I want the user to

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To RMI or Not to RMI

Question: We are now developing a Java-based remote monitoring systemapplication for our SCSI RAID subsystem products. This application canenable our customers to monitor the status, and change theconfiguration, of the

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Server.CreateObject vs. the OBJECT Tag

Question: What is the difference between creating objects using Server.CreateObject and the tag? Answer: The difference is when the object is actually created. Server.CreateObject makes an object whenever the code

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ADO

Question: I want to open a small ADO recordset from the server and save it the local drive to be used as a disconnected session. Can you tell how to