_isctype, iswctype, _isctype_l, _iswctype_l
The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.
The latest version of this topic can be found at _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 | _isctype | n/a | _iswctype |
n/a | _isctype_l | n/a | _iswctype_l |
| Routine | Required 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.