"DLL" stands for "dynamic link library". When a programmer has something of general usefulness to other programmers, he or she may choose to "package" the material in a dll. Users must have both the dll and the program that uses the things in it on their system, but, once they do, using the program which uses the things in the dll works just like using any other...
This tutorial is based on a newsgroups post from Mark Wilkinson... thank you, Mark! This tutorial will be short on explanation and not much longer on program... because Delphi makes things so easy!!
As usual, set up a directory for the exclusive use of the application we will develop during this tutorial. COPY (don't MOVE!) into it at least two .WAV files. I used ding.wav and chimes.wav which, in my in Windows 3.1 machine, were in C:\windows. Files you are going to play do not NEED to be in the application's directory, but it pays to eliminate distractions when exploring a new topic.
In this tutorial we take a look at accessing database files via Delphi. It is written using Delphi 2. I think the principles applied even in Delphi 1, but I'm not sure.
This tutorial develops a little game which is meant to make practicing typing fun.
As your programming skills develop, you will eventually find yourself putting certain things into program after program. The good people at Borland have provided "off the shelf" answers to many, many problems, but one of the great virtues of computers is their flexibility. What you use yours for is likely to be different from what you use yours for. Even if Borland could anticipate...
This tutorial assumes that you are comfortable with using arrays in general. For example, if writing a program to keep track of a small shop's stock of the 20 items it routinely carries, it is assumed that you would immediately plan to use something like StockLevel:array[1..20] of integer; (Working from 0 is often beneficial, but used 1 in case the zero index confused anyone.)
In this tutorial you will create a small application which does nothing useful, but illustrates one way the application can get input from the outside world. (Stephanie.) In a "real" application, of course, that input would cause meaningful changes in the application's behavior. In the illustrative application, the input is used merely to cause a change in the color of a rectangle on the...
The RS-232 serial interface is a wonderous thing. It has many marvelous capabilities. It is also something I've put of wrestling with for a long time. Search the web for "How To"s and you may see why. It turns out that things are not as bad as you might think. (But I must admit, the last program below doesn't work yet! But online resources assure me it "should"! Read on?)
The program offers a number of operating modes, but typically, you would have it running reading the sensors repeatedly. You can choose how frequently it should make readings. When it is running in this mode, it creates a graph of the readings, and, optionally, records the readings to a datafile.
If you know about client/ server systems, DDE has some client/ server attributes. When you are using DDE, somewhere there's a DDE server program running. You may have written it, or obtained it from someone else. Elsewhere, there's a DDE client program running. This tutorial shows you how to create a very simple one for a specific freeware server. Even if you are not working with 1-Wire chips,...
Each of us has a personal style. Each of us is working with slightly different needs. We often have miscellaneous bits of code which we seem to put in many of our applications. There are various reasons to justify creating external units to hold those routines. Some of the reasons are good, some bad, but all are still valid!
This tutorial is pretty rough around the edges, but was far enough along that I thought you'd want what's here. I'll try to revisit it, polish it, later.
This tutorial is based on information found at The Unofficial Delphi Developers FAQ... thank you, UDDF! I've worked up his information on how to read a joystick into a program which turns your computer into a stopwatch. Besides the joystick specific information, the program also illustrates how to respond to Windows messages coming from elsewhere in the computer. And finally, the program has, if I...
First I'll explain what I wanted a program for. You can decide whether there will be elements of interest to you! I'll also be taking you through my development process, which I think illustrates important skills.