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Berndt Hamboeck

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Top Stories by Berndt Hamboeck

In Part 1 of this article, we started to develop a small racing game using XNA Game Studio Express 2.0. We learned about the game loop and how it's implemented by the XNA (by using the Update and Draw methods) framework. We also created our first track on the screen and four cars started moving on the screen, but, sadly enough, they left the track and weren't seen again. What does that mean? It means we should take a closer look at collision detection. In addition we should design a menu with different options. You might remember that we want to have a racing game with three computer-driven cars or a network game with one or more other humans playing against us. Sounds easy? Well, it's not that hard, but we'll see that a few small changes in the behavior will lead to a few other problems that have to be solved (i.e., a game menu means we have to use so-called game s... (more)

LDAP with EAServer and PB 8.0

The Lightweight Directory Access Protocol (LDAP) is for accessing online directory services. It runs directly over TCP and can be used to access a standalone LDAP directory service. Developed in the early 1990s, it defines how a client should access data on the server. It does not specify how the data should be stored on the server. Most often you'll interact with a server specifically built for LDAP, such as OpenLDAP or iPlanet (now Sun ONE) Directory Server. However, LDAP can become a front end to any type of datastore. Because of this, most popular directory services now have... (more)

LDAP with EAServer and PB 8.0

In Part 1 (PBDJ, Vol. 9, issue 6) I discussed directory services and how they provide authentication, access control, and finder services for our application. In Part 2, I explain how the JNDI API lets us easily use LDAP. JNDI Overview The Java Naming and Directory Interface (JNDI) is an application programming interface (API) that provides naming and directory functionality to Java applications. It's independent of any specific directory service implementation, thus a variety of directories - new, emerging, and already deployed - can be accessed the same way. JNDI Architecture T... (more)

SQL Anywhere 10 & DataWindow .NET 2.0 in an ASP Environment

Most of the applications we software developers build need to interact somehow with data from a database. The .NET Framework defined by Microsoft provides a rich set of objects to manage database interaction; these classes are collectively referred to as ADO.NET and the latest versions of DataWindow .NET (which is now version 2.01). SQL Anywhere (version 10) fits perfectly in this environment, making development a lot easier; in addition, your applications will look good without spending a lot of time painting the user interface. In this article we'll look closer at exactly this... (more)

Third Generation Web Service Implementation

The Web Services Description Language (WSDL) makes it possible for automated code-generation tools, like PowerBuilder 9 with its Web services wizard, to simplify building clients for existing Web services. In my previous article "Axis" (PBDJ, Vol. 9, issue 8) we discussed the basic steps involved in implementing a Web service using Axis, EAServer, and PowerBuilder 8. Now we'll explore the technologies that make it easier to use Web services that have already been deployed. What Is WSDL? WSDL is an XML-based language used to define Web services and describe how to access them. For... (more)