Delphi 2009 Handbook by Marco Cantu

By Marco Cantu

Delphi 2009 instruction manual КНИГИ ; ПРОГРАММИНГ Delphi 2009 guide by way of Marco CantuPublisher: Wintech Italia Srl, Italy 2008 | 401 Pages | ISBN: no longer Assigned | PDF | four MBThis is a publication 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 ebook you could learn in basic terms approximately new good points of Delphi 2009 for Win32 in each one of those parts. The publication covers Delphi 2009 Unicode help, the hot language positive aspects (such as generics and nameless methods), the advancements of the IDE, the recent periods of the Run Time Library, the recent parts of the VCL (including the Ribbon control), and the extensions to the database structure and the DataSnap multi-tier technology.As traditional 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 case you nonetheless do not personal Delphi 2009, you could obtain the trial model and in addition examine the particular courses in motion in a sequence of video clips associated from the internet web page: zero 1 2 three four five

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Vista has extended Unicode support by default. When Windows XP and Vista need to display a Unicode code point, and this code point is not available in the current font, at times they perform “font substitution”, that is they display the code point in a different font19. This depends on the text display API being called (DrawText, TextOut, ExtTextOut behave differently), on the font you are using, and on the given code points. That's why using a complete Unicode font is a good idea20. If you are interested in more details, you can have a look at the UniFontSubst example, that basically draws a set of strings with different fonts and different API calls on its form.

Add ('SizeOf: ' + IntToStr (SizeOf (str1))); 32 As it is in the implementation section you cannot use it in your code, which is understandable for an internal data structure that's implementation specific and subject to change. There are helper functions to access the information you'll generally need to use. Add ('ByteLength: ' + IntToStr (ByteLength (str1))); This program produced output similar to the following: SizeOf: 4 Length: 3 StringElementSize: 2 StringRefCount: -1 StringCodePage: 1200 Is Unicode Size in bytes: 6 ByteLength: 6 The code page returned by a UnicodeString is 1200, a number stored in the global variable DefaultUnicodeCodePage.

Marco Cantù, Delphi 2009 Handbook 64 - Chapter 2: The Unicode String Type A fifth similar warning is issued when assigning a string constant to a string, in case some of the characters cannot be converted. pas(63): W2455 Narrowing given wide string constant lost information This is a warning you should get rid of, as the operation won't make a lot of sense. As another example of an implicit (and somewhat hidden) conversion slowing down the program execution, consider the following code snippet: str1 := 'Marco Cantù'; for I := 1 to MaxLoop2 do str1 := AnsiUpperCase (str1); In cases where the str1 variable is a UnicodeString all is fine, but in cases where it is an AnsiString, it will cause two conversions.

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