Download Delphi 2009 Handbook by Marco Cantu PDF

By Marco Cantu

Delphi 2009 guide КНИГИ ; ПРОГРАММИНГ Delphi 2009 guide via Marco CantuPublisher: Wintech Italia Srl, Italy 2008 | 401 Pages | ISBN: now not Assigned | PDF | four MBThis is a booklet approximately CodeGear Delphi 2009.You will not locate an advent to Delphi programming, its item Pascal language or its visible part Library in it. during this e-book you could learn merely approximately new gains of Delphi 2009 for Win32 in every one of those parts. The ebook covers Delphi 2009 Unicode aid, the recent language beneficial properties (such as generics and nameless methods), the advancements of the IDE, the recent sessions of the Run Time Library, the recent elements of the VCL (including the Ribbon control), and the extensions to the database structure and the DataSnap multi-tier technology.As ordinary for my books, i am masking the idea but in addition exhibiting you dozens of examples, you could obtain and play with in your computing device. in the event you nonetheless do not personal Delphi 2009, you could obtain the trial model and in addition examine the particular courses in motion in a chain of movies associated from the internet web page: zero 1 2 three four five

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You don't gain a lot (at least while using non-Unicode characters), but you don't incur any extra overhead either18. UnicodeString Parameters in API calls Although most Windows API functions taking a string as parameter are declared in the Windows unit with a PChar parameter, there are some exceptions to this rule. The GetTextExtentPoint32, ExtTextOut, LoadKeyboardLayout, DrawText, SetWindowText, LoadCursor, WinHelp, and HtmlHelp API declaration have overloaded (and inlined) versions taking a UnicodeString parameter.

In this respect, nothing has changed in Delphi 2009. What is different is that the Char type used to be an alias of AnsiChar and is now an alias of WideChar. Every time the compiler sees Char in your code, it reads WideChar. Notice that there is no way to change this new compiler default23. This is quite a change, impacting a lot of source code and with many ramifications. For example, the PChar pointer is now an alias of PWideChar, rather than PAnsiChar, as it used to be. We'll see how this affects the calls to Windows API functions in a later section in this chapter.

I compiled the same program in Delphi 7 and in Delphi 2009 and I noticed that the results were almost identical. I tried a similar loop based on the SetWindowText API call, and in this case I noticed a very odd effect. If I run the application in the debugger, it takes a 15% less time than the Delphi 7 counterpart, if I run it stand alone it becomes much slower. The problem, though is that if the program spends any time painting the caption over and over, its results will be totally modified. These two tests are probably not very pertinent.

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