Clean Up Ebooks Catalog
At times, when uninstalling Delphi to replace it with an updated version, the installer complains, stops and won't work as expected. In these cases, Code-Gear recommends cleaning all of the application folders (including some hidden ones that depend on the operating system). An alternative it to use Microsoft own Windows Install Clean Up utility, that you can find at
To address this issue .NET has a specific patterns you must implement any class needing resource clean-up should implement the Dispose method of the IDisposable interface. So you'll have to define the method in your classes, if needed, and than also call the method before all of the references to the object go out of scope. Only in some specific cases, for example when the object is placed in a container, a library class might call Dispose for you.
The pseudo-constructor and pseudo-destructor set the internal interface, that manages the actual data structures used behind the scenes, to nil cleaning up the pooling mechanism. However, as this operation is automatic for a local type such as a record, this is not needed, unless somewhere you refer to the context record using a pointer. For more information about the internals of the TRttiContext record you can refer to the following blog post by Berry Kelly
The starting point for working with native IDE objects is the INTAServices interface. Use this interface to add an image to the image list, an action to the action list, a menu item to the main menu, and a button to a tool bar. You can tie the action to the menu item and tool button. When the wizard is destroyed, it must clean up the objects it creates, but it must not delete the image it added to the image list. Deleting an image would scramble the indices for all images added after this wizard.
In Delphi the lists of recent projects and files have always been limited to a fixed size, 5 for projects and 10 for files (units). Now in the File Reopen menu you can pick the Properties command and open up a configuration dialog box, which lets you both change that number and and clean up the list, by removing non-existing files and individual entries you don't care about
As long as we're here, let's add the Help menu, too. Click on the placeholder to the right of the Edit menu. Choose Insert From Template again, and this time insert a Help menu. (Don't choose the Expanded Help menu, though.) We'll tidy up both the Edit and Help menus in the next section. Notice that the main form has been updating to show the new menu items as they are placed.
You can centralize the code that cleans up when your thread finishes executing. Just before a thread shuts down, an OnTerminate event occurs. Put any clean-up code in the OnTerminate event handler to ensure that it is always executed, no matter what execution path the Execute method follows.
To add a finalizer to a class, override the strict protectedFinalize procedure that is inherited from TObject. The .NET platform places limits on what you can do in a finalizer, because it is called when the garbage collector is cleaning up objects. The finalizer may execute in a different thread than the thread the object was was created in. A finalizer cannot allocate new memory, and cannot make calls outside of itself. If your class has references to other objects, a finalizer can refer to them (that is, their memory is guaranteed not to have been freed yet), but be aware that their state is undefined, as you do not know whether they have been finalized yet.
When the reserved word raise occurs in an exception block without an object reference following it, it raises whatever exception is handled by the block. This allows an exception handler to respond to an error in a limited way and then re-raise the exception. Re-raising is useful when a procedure or function has to clean up after an exception occurs but cannot fully handle the exception.
Many Delphi developers have long relied on third-party source code formatters to clean up the layout of existing code and promote company standards. Even if late to the game, Delphi itself now includes code formatting capabilities, with enough flexibility built into the system to make it worthwhile (even in what is clearly a first attempt, but still a good one).
This means that the traditional Delphi pattern of calling Free to clean up and writing a destructor to implement the cleanup will have the same semantics in .NET. The difference is that actually deallocating the memory allocated by objects is deferred to the garbage collector. It can be argued that if all your destructors do is free the memory of other nested objects, calling Free and implementing destructors in .NET is pure overhead. The counterargument is that if any of the subobjects implements a resource releasing IDisposable.Dispose (now or in the future), this is the correct way of doing things.
As long as you're here, you can add the Help menu, too. Click on the placeholder to the right of the Edit menu. Choose Insert From Template again, and this time insert a Help menu. (Don't choose the Expanded Help menu, though.) You'll tidy up both the Edit and Help menus in the next section. Notice that the main form has been updating to show the new menu items as they are placed.
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