By Chris Rolliston
Half 1 of a complete consultant to the language and middle non-visual libraries of Embarcadero Delphi XE2; during this half, easy language syntax and OOP performance are lined. Adopting an built-in method, the ebook covers either more recent and older good points along each other. whereas it will not train you the way to software, it assumes little Delphi wisdom in particular.
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Additional resources for Delphi XE2 Foundations - Part 1
A ‘pointer’ is so called because it ‘points’ to a specific place in memory: a pointer, then, contains a memory address to a piece of data, rather than being a piece of data as such. While coding in Delphi always involves working with things that are on one level concealed pointers, dealing with pointers proper is never actually required, in contrast to other native code languages like C and C++. Custom types Beyond the built-in types, you can define your own using a variety of techniques. In each case, a custom type is declared inside a type block: type TMyCustomType = //...
Delete(I); end; Say a list is passed to this routine having two items, and the first has the value 'dummy'. On the first iteration of the loop, this item will be deleted. Since there were originally two items in the list, the loop will still continue for another iteration though... boom! A ‘list index out of range’ exception is raised. 5] of Integer = (11, 22, 33, 44, 55); var Elem: Integer; begin for Elem in Ints do begin if Elem mod 3 = 0 then Continue; WriteLn(Elem); if Elem > 40 then Break; end; //outputs 11, 22, 44 In the case of a while or repeat/until loop, using Continue means the normal test for whether a new iteration is to be performed is skipped.
On clicking OK, a new dialog should come up listing the sample projects as they get downloaded. 4. Once complete, a third dialog will display allowing you to pick a project or project group to open. It isn’t crucial to pick the right one though, since you can open any of the projects as normal afterwards. Acknowledgements I wish to thank the following, in no particular order: John Toelken for looking over chapters 1 and 3; Kenneth Cochran and Mark Walker for spotting some typos in chapters 4 and 8 respectively; Warren Postma for some concrete suggestions concerning chapter 13; Primož Gabrijelcic for technical editing of chapter 15; and Jasper Bongertz and James Chandler for assisting with tests on physical Kindle devices.