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    <h3>Compiler Directives</h3> <p>In general, I'd advise you to be <strong>very</strong> wary of compiler directives. They serve their purpose, but for general use, they should probably be avoided altogether.</p> <p>The first problem is that you have to compile your app and test it twice, because it is fundamentally and/or subtly different for a directive on/off.</p> <p>This situation get worse for each additional directive, because you usually have to permute the combinations:</p> <p>D1 On, D2 On<br> D1 On, D2 Off<br> D1 Off, D2 On<br> D1 Off, D2 Off </p> <p>3 directives is 8 permutations... etc.</p> <h3>Unicode Strings</h3> <p>Please see: <a href="https://stackoverflow.com/questions/2048601/get-ready-for-delphi-2009-and-up-when-developing-with-delphi-7">Get ready for Delphi 2009 and up when developing with Delphi 7?</a><br> It has some nice answers for you to consider.</p> <h3>Question 1</h3> <p>As said, I advise against it. I also advise against for other reasons in my answer to the above mentioned question.</p> <p>More specifically: </p> <ul> <li>In Delphi &lt;2009, both lines are different.</li> <li>In Delphi >=2009 both lines are effectively the same.</li> </ul> <h3>Question 2</h3> <p>Not only is this ill advised for the same reasons as Question 1, but it actually has some subtle problems.</p> <p>The more precise type of <code>Text</code> (String) is determined by your Delphi version. So:</p> <ul> <li>In Delphi &lt;2009, the else part of your conditional casts a single character to a Word. (Probably with no ill effect.)</li> <li>In Delph >=2009, the if part of your conditional casts a double-byte character to a Byte. (With loss of information.)</li> </ul> <p>Also, there are some special considerations, and new support classes for 'special' characters. You'll want to look into those. Refer to: <a href="https://stackoverflow.com/questions/2190989/how-to-identify-unicode-keys-on-key-press">How to identify unicode keys on key press?</a></p> <h3>Question 3</h3> <p>I'm pretty sure that #13 will be treated as a single <strong>character</strong>, so in Delphi >=2009 where <em>Char</em> == WideChar, that <strong>character</strong> will take up 2 bytes.</p> <p>However, again look for <code>Linebreak</code> constants in Delphi. <code>System.sLinebreak</code> was probably introduced back in the Kylix days.</p>
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