mbtowc, _mbtowc_l
Convert a multibyte character to a corresponding wide character.
int mbtowc(
wchar_t *wchar,
const char *mbchar,
size_t count
);
int _mbtowc_l(
wchar_t *wchar,
const char *mbchar,
size_t count,
_locale_t locale
);
Parameters
wchar
Address of a wide character (type wchar_t).mbchar
Address of a sequence of bytes (a multibyte character).count
Number of bytes to check.locale
The locale to use.
Return Value
If mbchar is not NULL and if the object that mbchar points to forms a valid multibyte character, mbtowc returns the length in bytes of the multibyte character. If mbchar is NULL or the object that it points to is a wide-character null character (L'\0'), the function returns 0. If the object that mbchar points to does not form a valid multibyte character within the first count characters, it returns –1.
Remarks
The mbtowc function converts count or fewer bytes pointed to by mbchar, if mbchar is not NULL, to a corresponding wide character. mbtowc stores the resulting wide character at wchar, if wchar is not NULL. mbtowc does not examine more than MB_CUR_MAX bytes. mbtowc uses the current locale for locale-dependent behavior; _mbtowc_l is identical except that it uses the locale passed in instead. For more information, see Locale.
Requirements
Routine |
Required header |
|---|---|
mbtowc |
<stdlib.h> |
_mbtowc_l |
<stdlib.h> |
For additional compatibility information, see Compatibility in the Introduction.
Libraries
All versions of the C run-time libraries.
Example
// crt_mbtowc.c
/* Illustrates the behavior of the mbtowc function
*/
#include <stdlib.h>
#include <stdio.h>
int main( void )
{
int i;
char *pmbc = (char *)malloc( sizeof( char ) );
wchar_t wc = L'a';
wchar_t *pwcnull = NULL;
wchar_t *pwc = (wchar_t *)malloc( sizeof( wchar_t ) );
printf( "Convert a wide character to multibyte character:\n" );
wctomb_s( &i, pmbc, sizeof(char), wc );
printf( " Characters converted: %u\n", i );
printf( " Multibyte character: %x\n\n", *pmbc );
printf( "Convert multibyte character back to a wide "
"character:\n" );
i = mbtowc( pwc, pmbc, MB_CUR_MAX );
printf( " Bytes converted: %u\n", i );
printf( " Wide character: %x\n\n", *pwc );
printf( "Attempt to convert when target is NULL\n" );
printf( " returns the length of the multibyte character:\n" );
i = mbtowc( pwcnull, pmbc, MB_CUR_MAX );
printf( " Length of multibyte character: %u\n\n", i );
printf( "Attempt to convert a NULL pointer to a" );
printf( " wide character:\n" );
pmbc = NULL;
i = mbtowc( pwc, pmbc, MB_CUR_MAX );
printf( " Bytes converted: %u\n", i );
}
Output
Convert a wide character to multibyte character:
Characters converted: 1
Multibyte character: 61
Convert multibyte character back to a wide character:
Bytes converted: 1
Wide character: 61
Attempt to convert when target is NULL
returns the length of the multibyte character:
Length of multibyte character: 1
Attempt to convert a NULL pointer to a wide character:
Bytes converted: 0
.NET Framework Equivalent
Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.