devxlogo

We are an award-winning tech entrepreneurship website where trusted experts can provide value globally.

Since 1998, DevX has helped people start businesses, build websites, and provide enterprise technology to people globally. Interviewing the likes of Microsoft’s co-founder, Steve Ballmer, the publication brings comprehensive, reliable, and accessible insights to the Internet.

devxlogo

Trusted for 26 years

Over 30K Articles

1M+ Readers

Expert-reviewed

10K+ Tech Terms

As seen in:

microsoft logo
business_insider_logo
wired_logo
berkley
arstechnica_logo
hackernoon

The Latest

Power Script

Question: I am reading in an external data file using i_file = fileopen (“c:dataamt.dat”, linemode!,read!) fileread (i_file, filelines) fileclose (i_file) How would you avoid hardcoding the data file so that

Testing String Equality

Question: This is a section from a program I am writing. It goes through the first if statement fine, but when it gets to the second if statement it doesn’t

Java numerical performance

Question: I’m thinking of reimplementing a computationally intensive scientific app in Java. What fraction of native C speed do people usually see with current Java compilers? Answer: This is not

MFC applications

Question: I have no experience with MFC applications, and I am wondering if there is a URL that gives very basic samples of code for applications. I can’t even figure

obj files

Question: Do you know of any utilities that can convert an *.obj file back to its original code (*.cpp/*.c)? Answer: The simple answer is that there is no hope of

Two-way list with one pointer

Question: How can I make a two-way linked list with only one pointer? Answer: If, by two-way linked list, you mean a linked list that can be traversed from either

Function Pointers

Question: I’m converting an fsm from C to Java. The C code has a struct and one of the members contains a pointer that contains the address of a function.

Executing external programs

Question: I know that you can execute a program from a known drive using the system command, but what if you don’t know the drive letter? I am trying to

Generating a Compiler Warning

Question: I am looking for a way to get the javac compiler to generate a warning message that I specify in my code when it is compiling my code. I

First Visible List Row

Question: Is there a way to find out the first visible row in a List? Answer: The standard AWT java.awt.List class does not provide a means for determining the first

strchr

Question: Where can I see the source code to the functionstrchr? Answer: If you purchase a compiler such as the professional edition of VC++, the source code for all run-time

C programs to assembly programs

Question: How can I do a C++ program that converts simple C programs to assembly programs? Answer: This is a very complicated task. The first step would be a parser

Integer Size

Question: Our maximum int value is 32,768, but our minimum int value is -32,767. Why aren’t they the same? Answer: Because a short integer (2 bytes or 16 bits) can

IE Does Not Support Netscape’s Layer Tag

Question: I know that Netscape supports layers in JavaScript. Is there any way to make them work in Microsoft Internet Explorer 4 or 5? Answer: Unfortunately, no. Microsoft and Netscape

Global Fucntion in Datawindow fails in exe

Question: I’m working on PowerBuilder 6 under a Windows environment. I’m calling a global function in a datawindow object. This function gets called perfectly in the development environment, but it

security – object permissions

Question: Why can’t I revoke the “update” permission from four tables in a database in the object permissions GUI? I have successfully revoked “update” from all other tables in the

SysTray Popup Menu

Question: I’ve used your technique for getting the icon in the tray and for being notified when the user has clicked on it, but I’m having a problem getting a

Error When Performing Inserts on SQL Server

Question: When inserting data into a table that has an identity column that is also the key, the following error occurs: Non-Blob column in table is required to perform operation.

Using GetFileTime and CompareFileTime

Question: Could you please explain, along with examples, how to use the commands GetFileTime and CompareFileTime? I read the help topics but find it hard to digest what they say.

SQL Equivalent ‘Next’ and ‘Previous’

Question: I have a database that I would like to navigate on the primary key in alphabetical order using SQL statements. I would like to find out if there is

Outputting query data to a file

Question: I am trying to list out the contents of a field, and there are so many, that I need to send the output to a file. Can you tell

Checking for Blank Form Fields

If you use an HTML form at your Web site, you may not want anyone to submit the form if required fields are left blank. You can check for blank

Designating Disabled Text

A well-developed user interface will make it clear which components in a dialog are available to receive input from the user. The AWT Component class has a setEnabled method for

Runing a DOS Program

Question: I am trying to run a DOS program using the folowing syntax: WinExec(‘Command.com /c c: emaddr CN=variable’, wn_shownormal); I can’t manage to get it to work with a variable

Controlling the Printed Page

Question: Is it possible to control the printed page size and layout in DHTML? In other words, can I control how a DHTML page looks when it is printed and

Splitting a TXT File

Question: I want to split a TXT file into smaller TXT files. The program should split the file every time there are three empty lines. For example: Paragraph1Paragraph2 Paragraph1 and

Dynamically Changing Table Values

Question: I have a table that contains the values returned from a SQL database. I have created a division within each cell. The ID value for the division is the

SizeOf Function in Delphi

Question: I’m using Delphi 2.0 Client/Server. The Delphi Object Pascal user’s guide says that the Integer size is 2 bytes (signed 16-bit with Range -32768-32768). But when I do the

Displaying Text and Setting the Font

Question: I am working on a project that reads in teletext information from the COM port in 8-bit binary form. Since ASCII does not represent teletext graphical characters, I have

The Access Specifier of Special Member Functions

The default constructor, copy constructor, assignment operator, and destructor are special member functions. The implementation implicitly declares these member functions for a class when the program does not explicitly declare