Determines if a wide character corresponds to a multibyte character and returns its multibyte character representation.

int wctob(
   wint_t wchar


  • wchar
    Value to translate.

Return Value

If wctob successfully converts a wide character, it returns its multibyte character representation, only if the multibyte character is exactly one byte long. If wctob encounters a wide character it cannot convert to a multibyte character or the multibyte character is not exactly one byte long, it returns a –1.


The wctob function converts a wide character contained in wchar to the corresponding multibyte character passed by the return int value, if the multibyte character is exactly one byte long.

If wctob was unsuccessful and no corresponding multibyte character was found, the function sets errno to EILSEQ and returns -1.



Required header



For additional compatibility information, see Compatibility in the Introduction.


This program illustrates the behavior of the wcstombs function.

// crt_wctob.c
#include <stdio.h>
#include <wchar.h>

int main( void )
    int     bChar = 0;
    wint_t  wChar = 0;

    // Set the corresponding wide character to exactly one byte.
    wChar = (wint_t)'A';

    bChar = wctob( wChar );
    if (bChar == WEOF)
        printf( "No corresponding multibyte character was found.\n");
        printf( "Determined the corresponding multibyte character to"
                " be \"%c\".\n", bChar);
Determined the corresponding multibyte character to be "A".

.NET Framework Equivalent

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

See Also


Data Conversion


_mbclen, mblen, _mblen_l

mbstowcs, _mbstowcs_l

mbtowc, _mbtowc_l

wctomb, _wctomb_l