need help with Unicode strings

[jk]

I've tried the following

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#define _UNICODE
#define UNICODE

#include <stdio.h>
#include <tchar.h>

int main(int argc, char *argv[])
{
_TCHAR buf[50];

_tcscpy(buf, _T("hello"));
_tprintf(_T("%s - %d\n"), buf, sizeof(_TCHAR));
   
  return 0;
}

and I got the output

h - 2

, It should be "hello - 2". Huh? I can't see what I am doing wrong. Thanks in advance.

[Pelle]

Close - but no cigar... ;-)

You must use %ls for Unicode strings - not %s.

Pelle

[Robert Wishlaw]

Using _tmain instead of main, in a modified example from above, causes the error: Unresolved external symbol '_main'

Code Select Expand


#define _UNICODE
#define UNICODE

#include <stdio.h>
#include <tchar.h>

int _tmain(int argc, _TCHAR *argv[])
{
  _TCHAR buf[50];

  _tcscpy(buf, _T("hello"));
  _tprintf(_T("%ls - %d\n"), buf, sizeof(_TCHAR));
   
    return 0;
}

Robert Wishlaw

[Pelle]

Not _wmain? In tchar.h (~line 22) I define _tmain to be wmain for the Unicode case (like Micro$oft) - but I havn't implemented wmain yet (in many cases main works just as well).

I put this on the list of "things to look at in the future" a few years back, so I guess the future is here... ;-)

OK - I will look at it.

Pelle

[frankie]

Pelle,
I also miss the "_ttoi" function that should be defined in <tchar.h>.
F.

[jk]

You must use %ls for Unicode strings - not %s.

That's nice, thanks. Does that mean that the code should be like this?

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#ifdef _UNICODE
_tprintf(_T("%ls - %d\n"), buf, sizeof(_TCHAR));
#else
_tprintf(_T("%s - %d\n"), buf, sizeof(_TCHAR));
#endif    


Well, I'm confused. :?
Thanks again.

[Pelle]

Does that mean that the code should be like this?

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#ifdef _UNICODE
_tprintf(_T("%ls - %d\n"), buf, sizeof(_TCHAR));
#else
_tprintf(_T("%s - %d\n"), buf, sizeof(_TCHAR));
#endif    


Yes, since _tprintf is just a macro from tchar.h that expands to wprintf (_UNICODE defined) or printf (_UNICODE not defined) - you need something like this. The C runtime functions needs a format specifier (%s or %ls) that matches the string type.

_UNICODE is for C runtime Unicode mappings in tchar.h - you also have Windows Unicode mappings through UNICODE (without the initial underscore). If you don't need anything fancy, and it's OK to use the Windows API, you might want to look at wsprintf in this case (here %s will mean different things if UNICODE is defined or not).

Well, I'm confused. :?
Thanks again.

Well - it *is* confusing... just look at my explanation above...!  :shock:

Pelle

[Pelle]

Pelle,
I also miss the "_ttoi" function that should be defined in <tchar.h>.
F.

OK - I look at this too.

Pelle

[jk]

Cool.

Thank you.