If you are learning Object-Oriented Programming (OOP) or are curious about software development, you have probably heard the term Interfaces. This article explains the concept of…
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This is not that common of an issue, but it happens – when searching for memory leaks, remember to check any cross-referenced objects. Cross-referenced objects are, well, just that, objects that need to reference each other. For example, when “ClassA” needs to know about “ClassB”, and “ClassB” needs to know about “ClassA”. Continue reading to see how this can cause memory leaks in your projects and how to use Xojo’s WeakRef to fix it.
Comments closedThe technology and development world is always changing. First released in 1998, Xojo’s longevity is a testament to its ability and willingness to adapt from…
Comments closedThe Xojo ComboBox desktop control is a powerful one. It combines the capabilities of a TextField with the PopupMenu. That means that you can choose from the available options in the associated menu or you can type another value in the ComboBox text field. What about getting the ComboBox to do things not included in the class?
Comments closedThe singleton design pattern has its place in the desktop environment where there will be only one user running the application, and when that user quits the app the singleton is destroyed. This doesn’t fit the requirements of a multi-user environment such as the web where many users will be accessing the application at once. I recently came across this issue when porting a desktop app to the web which required me to design a singleton class that is session sensitive. Here’s a walk through of how I achieved my goal. Please note that scopes are particularly important when creating this class.
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With so many programming languages and development environments around … why you should try Xojo? I could tell you more than 400,000 reasons to just jump-in right away; reasons I’ve heard for over 10 years now from Xojo users around the world that are building all kind of apps, products and solutions in all kinds of fields. Nevertheless, if I really think about, all of these reasons can be condensed into the following 10 main points. Continue reading and I’m pretty sure you will want to give Xojo a try too!
Comments closedAs an Object Oriented Programming language (OOP), Xojo’s data types, especially the non-primitive ones, use or can use a Class hierarchy. This means that one class, either included by default in the Xojo Framework or created from scratch, can act as a base or root class for other classes based upon them.
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Using Xojo Web to create complete web apps and solutions means not having to learn a bunch of interpreted languages and dozens of ever-changing frameworks. I’m looking at you: HTML, CSS (is that even a language?), JavaScript, PHP, et al. Of course, Xojo Web not only makes it possible to create your own web apps, but it also acts as the perfect middleware that your desktop and iOS apps can communicate with. Learn about APIs and web services with Xojo in the tutorial blog post.
Comments closedXojo is an Object Oriented Programming Language and, among other things, that means that it supports Methods Overloading. We have seen in other posts that some of these overloaded methods can be Class Constructors, but, there are others things you can do. For example, we can overload the operators. These are the methods in charge of adding two instances of the same class, subtracting, multiplying or dividing them. But we also have at our disposal another operator we can overload: Lookup. What advantages does this give us and how it does it work? Let’s explore it while building a Preferences class we can use in any of our projects.
Comments closedObject Oriented Programming (OOP) puts in our hands the ability to create apps in a flexible and powerful way. Xojo embraces that philosophy in the Xojo language itself, allowing us to implement code in a flexible way for reuse, extension and maintainability that reduces the development cycles. One of these language tools is, in fact, common in other low level programming languages: Casting or type conversion. If you are interested in this (and you should be), continue reading and discover what it is, why you should be interested in it and how can you use it in your next Xojo app!
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