_isctype, iswctype, _isctype_l, _iswctype_l

 

Tests c for the property specified by the desc argument. For each valid value of desc, there is an equivalent wide-character classification routine.

int _isctype(  
   int c,  
   _ctype_t desc  
);  
int _isctype_l(  
   int c,  
   _ctype_t desc,  
   _locale_t locale  
);  
int iswctype(  
   wint_t c,  
   wctype_t desc   
);  
int _iswctype_l(  
   wint_t c,  
   wctype_t desc,  
   _locale_t locale  
);  

Parameters

c
Integer to test.

desc
Property to test for. This is normally retrieved using ctype or wctype.

locale
The locale to use for any locale-dependent tests.

_isctype and iswctype return a nonzero value if c has the property specified by desc in the current locale or 0 if it does not. The versions of these functions with the _l suffix are identical except that they use the locale passed in instead of the current locale for their locale-dependent behavior. For more information, see Locale.

The behavior of _isctype and _isctype_l is undefined if c is not EOF or in the range 0 through 0xFF, inclusive. When a debug CRT library is used and c is not one of these values, the functions raise an assertion.

Generic-Text Routine Mappings

Tchar.h routine_UNICODE and _MBCS not defined_MBCS defined_UNICODE defined
n/a_isctypen/a_iswctype
n/a_isctype_ln/a_iswctype_l
RoutineRequired header
_isctype<ctype.h>
iswctype<ctype.h> or <wchar.h>
_isctype_l<ctype.h>
_iswctype_l<ctype.h> or <wchar.h>

For more compatibility information, see Compatibility in the Introduction.

All versions of the C run-time libraries.

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

Character Classification
Locale
is, isw Routines

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