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DevX - Software Development Resource

Correct Path Names

You may have encountered this problem before–your program contains a full path name of a file, into which data has to be written or read from: FILE * f =

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Restrictions on Operator Overloading

The following restrictions apply to operator overloading: 1. Invention of new operators is not allowed. For example: void operator @ (int) ; //illegal, @ is not a built-in operator or

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The Trouble with Triggers, Part II

et’s talk about when and why we use triggers and the technical details of how to write a trigger. To recap, a trigger is a stored piece of code that

DevX - Software Development Resource

Invoking the Default Browser

Here’s a Visual Basic routine that invokes the default browser: Private Declare Function ShellExecute Lib”shell32.dll” Alias “ShellExecuteA” (ByValhwnd As Long, ByVal lpOperation As String,ByVal lpFile As String, ByVal lpParametersAs String,

DevX - Software Development Resource

FTP with Java

Normally, from within a Java applet you can create a java.net.URL instance using the “ftp://” protocol handler. But you may need a third-party library to access FTP from a Java

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Days Left Until Specific Date

Using the Date functionality in JavaScript, you can post the number of days left until a certain date. Internally, JavaScript stores dates as the number of milliseconds from midnight (GMT)

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A Quick Explorer-Like Interface

Although the new VB5 Application Wizard can build a shell application with an Explorer-like interface, it is often desirable to drop a quick Explorer form into your code without the

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Applying procedure to every file on a drive

Question: For EVERY filename present on a hard drive, I need to convert the path and filename to a string and then evaluate the string for certain conditions. If those

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CDONTS.NewMail does not send

Question: Hi, I have set up SMTP and I’m trying to send e-mail. It appears to work, and reports no errors, but the mail is not sent to the recipient,

DevX - Software Development Resource

VB and ISP and Web-based analysis

Question: I have numerous data analysis programs written in VB4/5 that I would like to put on a server for server-based data analysis. It would require uploading data files from

DevX - Software Development Resource

Create Timeline Templates

When utilizing project management tools, create a timeline template that models your development methodology. Set up the dependencies and defaults within this template. Then you can copy and paste it

DevX - Software Development Resource

ANALYZE Your Visual Source Safe Database

Set up a task in your scheduler of choice to run the ANALYZE.EXE programagainst your Visual Source Safe (VSS) database at least once a month.This tool allows VSS to check

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Who’s Backing Up Your Source Code?

Utilizing version control systems is very important, but if no one is backing up your version control database, you are needlessly stepping close to the brink of disaster. Most source

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Set Up Useful Shortcuts in the Send To Folder

If you develop applications that use components that need to be registered, consider setting up a shortcut to regsvr32 in the “Send To” folder on a user’s machine as part

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Better Alternatives to Macros

Macros in C++ are better avoided. They are unsafe, hard to debug, and may bloat your .exe files. C++ offers significantly better alternatives to them: 1. Function-like macros should be

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Before You Resort to Void *…

Void * can serve as a generic data pointer, yet it suffers from the well-known ailments associated with pointers: it can be NULL or a dangling pointer. Furthermore, it usually

DevX - Software Development Resource

Default Template Argument

Like ordinary functions, templates can have default type arguments. A good example is STL’s vector. It actually has two arguments–the second one is an allocator class template. Since an allocator

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Let the User Control Long Operations

To allow the user to control long operations, use a single CommandButton to control starting and stopping a looping process: Dim Running As BooleanPrivate Sub CmdStartStop_Click() If Running Then ‘

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Pass Parameters to User Dialogs

It’s fairly common practice to add buttons to your date and numeric fields to allow users to select and display a popup calendar or calculator. However, to display a calculator

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A Better Way to Swap Two Integer Variables

The algorithm shown in the tip, “Swap Values Using Only Two Variables” [“101 Tech Tips for VB Developers, Supplement to the February 1997 issue of VBPJ, page 25], crashes not

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Use Arrays, Not Collections

Arrays take less memory and are faster than collections. If you don’t need to use a collection’s keyed lookup, easy extensibility, and other features, use an array instead.

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Draw Complex Shapes

You can create complex shapes easily if you have a copy of Microsoft PowerPoint, CorelDraw, or any other graphics editor. Using your graphic editor’s drawing tools, draw the shape you

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Don’t Show me the Hourglass

When creating applications, especially on an enterprise scale, don’t create them so that they run start to finish, tying up the user’s PC needlessly. If all you need is two

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BDE Configuration

Question: I’ve developed a database using Microsoft Access, exporting the files to a Paradox 5 format. Now, the application I’ve developed that utilizes this database is currently running on two

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Putting Hints in Status Bar

Question: I am using the application.onhint example from the Delphi help files to put all hints in my status bar. It works on all but one form. I’m using the

DevX - Software Development Resource

JavaScript Compatibility

Question: As a Web designer, one of my biggest struggles is JavaScript compatibility with previous browser versions (such as IE3, IE4, N2, N3, and N4). Is there a way I