By Chris Rolliston
Half three of a complete consultant to the language and middle non-visual libraries of Embarcadero Delphi XE2; during this half, programs, RTTI, interoperability and multithreading performance are all lined. Adopting an built-in strategy, the booklet covers either more moderen and older positive factors along each other. it is usually insurance of XE2's help for Mac OS X.
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Extra resources for Delphi XE2 Foundations - Part 3
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AddObject(StatusBar); end. Other than the slightly altered manner in which the status bar is created, the rest is as you would initialise a control in code regardless of packages being used or not. If you now recompile the package and rerun the host application, activating the package should cause a status bar to appear along with the extra tabs, with no errors arising when the package is unloaded. ] Setting things up when targeting OS X If you are using the Professional or higher edition of Delphi or RAD Studio, changing each of the four projects’ target platforms to Win64 and recompiling should lead the application and its plugins to work as before, only now as a 64 bit program.
So, after making that package the active project again, and add two more units to it. pas. Free; end. A bit like the PluginManager unit we implemented for the host application, this one leverages TComponent’s built-in memory management: instead of freeing an injected control directly, we have it owned by an internal object which is freed in its stead. If the parent form has already been freed in the meantime, taking the injected control with it, no access violation will result because the owner will have been notified of the fact internally.
The casts are to be on the safe side, since while Tag is a signed pointer-sized integer, an HMODULE (what LoadPackage returns) is an unsigned pointer-sized integer. The final bit of code for the main form is the LoadPluginTabs method called by the OnChangeCheck handler we have just defined. Text + 'w'); end; Break; end; except UnloadPlugin(Result); raise; end; end; After loading the plugin, we cycle through the RTTI system’s list of packages to find the one we just loaded. Once matched, we loop through the package’s types looking for IPluginFrame implementers.