Question

How do I get the byte size of a multibyte-character string in Visual C? Is there a function or do I have to count the characters myself?

Or, more general, how do I get the right byte size of a TCHAR string?

Solution:

_tcslen(_T("TCHAR string")) * sizeof(TCHAR)

EDIT:
I was talking about null-terminated strings only.

Answer 1

According to MSDN, _tcslen corresponds to strlen when _MBCS is defined. strlen will return the number of bytes in the string. If you use _tcsclen that corresponds to _mbslen which returns the number of multibyte characters.

Also, multibyte strings do not (AFAIK) contain embedded nulls, no.

I would question the use of a multibyte encoding in the first place, though… unless you’re supporting a legacy app, there’s no reason to choose multibyte over Unicode.