Download Delphi XE2 Foundations - Part 2 by Chris Rolliston PDF

By Chris Rolliston

Half 2 of a accomplished advisor to the language and center non-visual libraries of Embarcadero Delphi XE2; during this half, string dealing with, collections and I/O are lined. Adopting an built-in technique, the e-book covers either more recent and older good points along each other.

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IntToStr) is called and the result passed on to the main Append overload that takes a string. ])), and AppendLine just a shortcut for Append(SLineBreak) or Append(S + SLineBreak). All indices are zero based. ToString(1, 2) returns 'BC'. Free; end; Use the Equal method if you want to check whether the content of two string builder objects is the same, since it will be slightly more performant than comparing the results of ToString. The test always case sensitive though, and more problematically, the respective MaxCapacity properties are taken into account too.

Case sensitive as well is the Replace method. Replace('x', 'z', 10, 100); //raises ERangeError This contrasts with (for example) the Copy standard string function, which will silently correct overextended ranges. TStringBuilder method style If you look closely at the TStringBuilder methods, you will see that most of them are functions where you would normally have expected procedures. Append('Three'); Think twice before using this style too heavily though, since it makes debugging much harder. This is because it prevents setting a breakpoint on individual method calls — from the debugger’s point of view, the three calls to Append here constitute a single executable step.

X, 9x and ME. Not natively supporting Unicode, those operating systems worked with different ‘code pages’ for different scripts instead — English, French and German shared one code page (‘Western European’), Greek had another, Cyrillic a fourth, and so on, with each code page being assigned its own number: • 1250 for the ‘Central European’ code page • 1251 for Cyrillic • 1252 for ‘Western European’ (alias ‘Latin 1’) • 1253 for Greek • 1254 for Turkish • 1255 for Hebrew • 1256 for Arabic • 1257 for Baltic languages • 1258 for Vietnamese (this is very similar but not identical to Latin 1) • 874 for Thai • 932 for Japanese Shift-JIS • 936 for Simplified Chinese GBK • 949 for Korean • 950 for Traditional Chinese Big5 Collectively, these became referred to as ‘Ansi’ code pages, due to the fact Microsoft based the ‘Western European’ one on a draft American National Standards Institute (ANSI) standard.

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