Re: L macro


"George" <George@xxxxxxxxxxxxxxxxxxxxxxxxx> ha scritto nel messaggio
news:5B63A9B8-4712-4219-AC85-C302CAC4F2E2@xxxxxxxxxxxxxxxx

Could anyone explain how to use L macro in Visual Studio 2003 and Windows
Console project? Which header file is needed?

L is not a macro, it is a prefix for strings, to tell the compiler that the
L-prefixed string is a Unicode UTF-16 string (so it is an array of 16 bits
WCHAR-s and not of 8 bits char-s).

e.g.

"Hello": ANSI string, stored as: 'H' 'e' 'l' 'l' 'o' '\0'

L"Hello": Unicode UTF-16 string, stored as L'H' L'e' L'l' L'l' L'o' L'\0'
(i.e. a sequence of 16 bits WCHAR-s).

So, if you want to use Unicode UTF-16 strings in your app, you should put
the L prefix, as shown above.

There is also a preprocessor macro, called _T (to be used like so:
_T("Hello") ), which evaluates to nothing on ANSI builds, and to L on
Unicode builds.

Note that, if you use resource string-tables and CString::LoadString method
to load strings from resources, you won't need the L"..." thing, and your
app's localization will also be easier, IMHO.

Giovanni



.

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