![]() For next version 20.4 we have a few more little changes to improve the plugin. And when you call SetFont without passing an encoding, we default to unicode.Ĭhanges like the above may help to make use of the plugin more easier. Unicode support got better over the years and nobody should need those any more. ![]() In DynaPDFMBS class we deprecated all the Ansi versions of the functions. The SetCellPicture method for DynaPDFTableMBS class takes directly a picture to make this easier for developers to pass pictures. In DynaPDFPageMBS class we got properties visible in the debugger, so you can directly inspect the boxes for the page. With our own DynapdfGraphicsPathMBS class we got even support for drawing paths with the new Xojo methods to do so. But new users may not run into an error, because no font is set.Įarlier in 20.2 we added support for ignoring ClearRect calls in graphics class to be able to draw over an existing PDF page and not fill all the space with white color. If you change the font, this font reference will be discarded on saving as DynaPDF cleans up the object tree when writing the PDF. We set Helvetica 12 in point as default font for every new PDF document. In the current version 20.3 we added support for ClearRectangle and FillPath methods, one of the changes for API 2.0 in Xojo. ![]() Improvements for MBS Xojo DynaPDF Plugin Our MBS Xojo DynaPDF Plugin is quite popular and we try to improve it regularly. In the parameters, we specify the class name and the data either as a string or a memory block. ![]() In the JavaVMMBS class we have two new methods, named DefineClass, that allow us to load a class with raw class data from the buffer. In the parameters you pass the function pointer to a C function which later calls back your callback. With the DeclareCallBackMBS class you can create callback functions dynamically. We support also the possibility to define declares at runtime. In comprehension to the built-in declares in Xojo, those functions allow a much more dynamic calling of functions with various calling conventions. The DeclareFunctionMBS class give you the possibility to call C functions. You can enter a path or pass a folderItem when you create an instance of this class. It inspects the available functions and load functions by name. The DeclareLibraryMBS class Allows you to load a DLL on Windows, a dylib on MacOS and shared object on Linux. The classes of this topic handle the loading of dynamic C libraries and calling functions within them. In this article I want to introduce you the new functionalities from the MBS Xojo Plugins in version 20.3. This special case does not occur often, but when it does you can make use of Weak References to help mitigate it.News from the MBS Xojo Plugins Version 20.3 In those cases, you’ll need to manually release an object (set it to Nil) so that its reference count decreases to allow it to eventually reach 0, thus allowing it to get removed from memory. Xojo has been using ARC since 1998 (v1.0)!ĪRC really is a great way to handle object memory management. With ARC you generally don’t have to worry about memory management except for the special case of circular references. You’re hearing more about it again as Swift also makes use of this memory management technique.īut ARC is old news for Xojo developers. This feature most recently generated a lot of interest when Objective-C added it a few years ago. With this technique, the language tracks references to objects and when an object’s reference count reaches 0, it is automatically and immediately removed from memory. You can think of ARC as the “ just right” memory management strategy. This is pretty easy on the programmer since they don’t have to worry about anything, but it can cause some significant performance problems for your app when the garbage collector is running.Īn alternative that has became more popular in recent years is Automatic Reference Counting. With garbage collection, the language run-time periodically purges objects from memory when they are no longer referenced. Starting with Java, the concept of garbage collection became more popular. In the beginning, this management of memory was left entirely to the programmer, such as with C++ or originally with Objective-C. With object-oriented programming, each new object you create takes up space in memory. As defined on Wikipedia, Automatic Reference Counting (or ARC) is a “memory management enhancement where the burden of keeping track of an object’s reference count is lifted from the programmer to the compiler.”
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