Trouble with _totupper
in [Win32 API]
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From: Paul N on 6 Aug 2010 10:31 I'm writing a small program which reads an input from one edit box, converts it in some way and sends the output to another edit box. Suppose I have put "aäAÄ" into the first edit box, where the second character is a-umlaut (Alt-132) and the fourth is A-umlaut (alt-142). If I convert it using for (p = from; *p; p++) { if (_istlower(*p)) *p = '1'; else *p = '0'; } then I get the result "1100" which is what I would expect. However, if I convert it using: for (p = from; *p; p++) { if (_istlower(*p)) *p = _totupper(*p); } then I get the result "AäAÄ" - the normal a gets converted properly but a-umlaut does not. I was a bit surprised at this, as I would have thought that if it can correctly tell whether ä and Ä are upper and lower case then it should be able to convert them properly. I'm using the default settings for VC++, so TCHAR is WCHAR, _istlower is iswlower and _totupper is towupper. Am I doing something wrong, or am I just being optimistic in what _totupper can do? If so, is there anything else I can use? Many thanks. Paul.
From: Jackie on 7 Aug 2010 04:03 Paul N wrote: >.. My only guess is that it does not consider locale. From http://www.cplusplus.com/reference/clibrary/cctype/islower/: "Notice that what is considered a letter may depend on the locale being used; In the default C locale, a lowercase letter is any of: a b c d e f g h i j k l m n o p q r s t u v w x y z." "a locale-specific template version of this function (islower) exists in header <locale>." Maybe you should try this: http://www.cplusplus.com/reference/std/locale/islower/ -- Regards, Jackie
From: Jackie on 7 Aug 2010 04:07
Jackie wrote: > ... Or in your case, _istlower_l or _totupper_l. http://msdn.microsoft.com/en-us/library/1z2s6by9.aspx http://msdn.microsoft.com/en-us/library/45119yx3.aspx -- Regards, Jackie |