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From: Giovanni Dicanio on 7 May 2008 08:59 "Lucress Carol" <incognito.me(a)gmx.de> ha scritto nel messaggio news:649b711a-0a07-4d16-a54e-d5a4ff357263(a)25g2000hsx.googlegroups.com... > I also found out that with VC++ 2008 either one uses this _T() or > changes the project configuration to use multibyte strings like this: > Open the properties and navigate to Configuration Properties > > General. > And then switch Character Set to "Use Multi-Byte Character Set". Lucress: I would suggest you to use Unicode (UTF-16), *not* the "multi-byte character set". IMHO, MBCS is an obsolete thing. Unicode should be the default technique to store and manage strings - like modern languages like C#, Java, Python, etc. do. Using Unicode for text is a good investement for internationalization/localization of your applications. Note that Unicode (UTF-16) is also the way that Windows XP and Vista internally store strings. When you pass an MBCS string to Windows APIs, the MBCS string is converted to Unicode (UTF-16), and the Unicode version of the API is called. (So passing MBCS strings is also inefficient due to this conversion.) Giovanni
From: Giovanni Dicanio on 7 May 2008 09:07 "Lucress Carol" <incognito.me(a)gmx.de> ha scritto nel messaggio news:649b711a-0a07-4d16-a54e-d5a4ff357263(a)25g2000hsx.googlegroups.com... > I also found out that with VC++ 2008 either one uses this _T() or > changes the project configuration to use multibyte strings like this: > Open the properties and navigate to Configuration Properties > > General. > And then switch Character Set to "Use Multi-Byte Character Set". Note that the _T() decorator is a preprocessor thing. If you compile in Unicode (_UNICODE and UNICODE preprocessor labels are defined), _T("Something") expands to L"Something". And L"Something" is a Unicode UTF-16 string. Instead, if you are compiling in MBCS mode, _T("Something") expands to just "Something" ("old-style" ANSI/MBCS string). If you are not interested at all in ANSI/MBCS builds, you may also use L"Something" for your string literals. Giovanni
From: M. Shoaib Surya on 7 May 2008 09:15 Lucress: Not exactly, _T() should be used all the time, that is, in both Unicode and Multi-Byte character sets. It is indeed a good programming practice to declare your string literals within the _T() macro even if you are not using Unicode character set at this time. TCHAR and the corresponding _T() are actually macros that are there to help you out so that you don't have to make changes in your code if you switch between unicode and non-unicode character sets. If you have Unicode configuration, TCHAR is #define'd into WCHAR and in the other case, into the plain old single-byte char datatype. Also, it should be noted that this is not something new to VC 2008. But yes, you choose this seting as "Use Multi-Byte Character Set" or "Use Unicode Character Set" option in Configuration Properties > General as you mentioned in VS2008 (and in VS 2002/2003/2005). One last note is that this is a VC extension and your code with TCHAR would break if it needs to compile on multiple platforms other than Windows (to the best of my knowledge). Regards, Shoaib. "Lucress Carol" <incognito.me(a)gmx.de> wrote in message news:649b711a-0a07-4d16-a54e-d5a4ff357263(a)25g2000hsx.googlegroups.com... > On 7 Mai, 12:18, "Giovanni Dicanio" <giovanni.dica...(a)invalid.com> > wrote: >> "Giovanni Dicanio" <giovanni.dica...(a)invalid.com> ha scritto nel >> messaggionews:%23rD6RuCsIHA.2208(a)TK2MSFTNGP04.phx.gbl... >> >> >> >> > "M. Shoaib Surya" <shoaibsu...(a)hotmail.com> ha scritto nel messaggio >> >news:%23%23mRGqCsIHA.1768(a)TK2MSFTNGP03.phx.gbl... >> >> >> m_EditState.SetWindowText("No image loaded"); >> >> m_EditState.SetWindowText("Loading image"); >> >> > Those strings should be decorated with _T(): >> >> > ...SetWindowText( _T("Something...") ); >> >> BTW: I would prefer reading these strings from a string table resource. >> That works better for localization (instead of having string literals >> inside >> the source code). >> >> Giovanni > > > Thank you Guys for your help and advice. > > I also found out that with VC++ 2008 either one uses this _T() or > changes the project configuration to use multibyte strings like this: > Open the properties and navigate to Configuration Properties > > General. > And then switch Character Set to "Use Multi-Byte Character Set". > > > Lucress > >
From: Lucress Carol on 7 May 2008 09:38 On 7 Mai, 15:15, "M. Shoaib Surya" <shoaibsu...(a)hotmail.com> wrote: > Lucress: > Not exactly, _T() should be used all the time, that is, in both Unicode and > Multi-Byte character sets. It is indeed a good programming practice to > declare your string literals within the _T() macro even if you are not using > Unicode character set at this time. > > TCHAR and the corresponding _T() are actually macros that are there to help > you out so that you don't have to make changes in your code if you switch > between unicode and non-unicode character sets. If you have Unicode > configuration, TCHAR is #define'd into WCHAR and in the other case, into the > plain old single-byte char datatype. > > Also, it should be noted that this is not something new to VC 2008. But yes, > you choose this seting as "Use Multi-Byte Character Set" or "Use Unicode > Character Set" option in Configuration Properties > General as you mentioned > in VS2008 (and in VS 2002/2003/2005). > > One last note is that this is a VC extension and your code with TCHAR would > break if it needs to compile on multiple platforms other than Windows (to > the best of my knowledge). > > Regards, > Shoaib. > > "Lucress Carol" <incognito...(a)gmx.de> wrote in message > > news:649b711a-0a07-4d16-a54e-d5a4ff357263(a)25g2000hsx.googlegroups.com... > > > > > On 7 Mai, 12:18, "Giovanni Dicanio" <giovanni.dica...(a)invalid.com> > > wrote: > >> "Giovanni Dicanio" <giovanni.dica...(a)invalid.com> ha scritto nel > >> messaggionews:%23rD6RuCsIHA.2208(a)TK2MSFTNGP04.phx.gbl... > > >> > "M. Shoaib Surya" <shoaibsu...(a)hotmail.com> ha scritto nel messaggio > >> >news:%23%23mRGqCsIHA.1768(a)TK2MSFTNGP03.phx.gbl... > > >> >> m_EditState.SetWindowText("No image loaded"); > >> >> m_EditState.SetWindowText("Loading image"); > > >> > Those strings should be decorated with _T(): > > >> > ...SetWindowText( _T("Something...") ); > > >> BTW: I would prefer reading these strings from a string table resource. > >> That works better for localization (instead of having string literals > >> inside > >> the source code). > > >> Giovanni > > > Thank you Guys for your help and advice. > > > I also found out that with VC++ 2008 either one uses this _T() or > > changes the project configuration to use multibyte strings like this: > > Open the properties and navigate to Configuration Properties > > > General. > > And then switch Character Set to "Use Multi-Byte Character Set". > > > Lucress- Zitierten Text ausblenden - > > - Zitierten Text anzeigen - Thank you very much for all the explanations. Lucress
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