PowerBuilder Tips, Tricks, and Techniques

Arthur Hefti

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Top Stories by Arthur Hefti

Keeping information away from curious eyes is a challenging task. For example, you might need to encrypt data before sending it over the Internet. Or you might be storing some information in a database that not even an administrator is allowed to see. This article provides a brief overview of encryption techniques and shows how to do encryption in PowerBuilder. Short History Encryption goes as far back as ancient Egypt. In 1900 B.C. the Egyptians used a derivation of standard hieroglyphics to make a message more difficult to read. The art of hiding messages improved over the centuries. The early Greeks used a combination of wooden sticks and leather ribbon whereas the early Romans used simple substitution (replacing one character by another). In the 16th century, the polyalphabetic substitution was invented. That was followed by the Enigma encryption machine, which t... (more)

PowerBuilder - The ClassDefinition Object

In the first article we presented a some theories about the ClassDefinition object and were able to show the libraries of a PB application in a treeview control. This month we'll read the objects from the libraries and inspect their content. When a user expands an entry in the treeview, we check to see if it was expanded once already. If it was, we don't take any action. We code this in the itemexpanding event of the treeview control, where we get the clicked treeviewitem by calling This.GetItem. If it wasn't expanded already, we check to see if the level of the treeviewitem is... (more)

The New Generation of Decompilers

The latest development technologies rely on intermediate languages and can be decompiled. PowerBuilder is no exception. In this article, we will address the risks posed by decompilers. We will also discuss what can be done to protect against the possible negative results of decompilation - whether you create in-house applications, commercial applications, or are using these applications for your business. A PowerBuilder Decompiler? A decompiler is a program that reads executable code and decompiles it, providing access to source code. It has nothing to do with viruses or other f... (more)

Bereichsübergreifendes Arbeiten mit CATTOR

Das Video zeigt kurz das Arbeiten mit CATTOR für mehrere Bereiche. Dies ist z.B. wichtig für Technische Werke die ihren Kunden mehr als einen Service zur Verfügung stellen. Die einzelnen Bereiche können in CATTOR definiert werden. Auf einer Site werden Lokale pro Bereich erfasst (Lokale sind auch die Basis für die Berechtigungen). So kann z.B. das Lokal "Verteilerraum 1. UG" für die Bereiche Gas, Strom und Wasser definiert werden. Diese Information hilft in der Planung oder vom Techniker beim Einsatz vor Ort. Crosspost von http://www.cattor.ch. ... (more)

Prognos with DataWindow.NET 2.0 and PowerBuilder 11 Web Services

Prognos is an application used over the Internet to determine if it makes sense to apply for a scholarship. It's part of a program package used in a couple of cantons (the equivalent of a state in the U.S.) in Switzerland to manage applications for a scholarship. The current version runs with DataWindow.NET 2.0 and uses PowerBuilder 11 Web Services. To keep the installation slim it uses no database; instead the data is stored in DataWindows or XML files. Prognos makes use of AJAX techniques and accesses .NET classes from PowerBuilder for XML handling. Since it's used in Switzerl... (more)