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_ultoa_s, _ultow_s

Convert an unsigned long integer to a string. These are versions of _ultoa, _ultow with security enhancements as described in Security Features in the CRT.

errno_t _ultoa_s(
    unsigned long value,
    char *str,
    size_t sizeOfstr,
    int radix 
);
errno_t _ultow_s(
    unsigned long value,
    wchar_t *str,
    size_t sizeOfstr,
    int radix 
);
template <size_t size>
errno_t _ultoa_s(
    unsigned long value,
    char (&str)[size],
    int radix 
); // C++ only
template <size_t size>
errno_t _ultow_s(
    unsigned long value,
    wchar_t (&str)[size],
    int radix 
); // C++ only

value

Number to be converted.

str

String result.

sizeOfstr

The size of the str in bytes for _ultoa_s or words for _ultow_s.

radix

Base of value.

Zero if the function was successful or an error code.

The _ultoa_s function converts the digits of value to a null-terminated character string and stores the result (up to 33 bytes) in str. The radix argument specifies the base of value, which must be in the range 2 – 36. _ultow_s is a wide character version of _ultoa_s; the second argument of _ultow_s is a wide character strings.

If str is a NULL pointer, or if sizeOfstr is less than or equal to zero, the invalid parameter handler is invoked, as described in Parameter Validation. If execution is allowed to continue, these functions return -1 and set errno to EINVAL or if the value or str out of range of a long integer, these functions will return a -1 and set the errno to ERANGE.

In C++, using these functions is simplified by template overloads; the overloads can infer buffer length automatically (eliminating the need to specify a size argument) and they can automatically replace older, non-secure functions with their newer, secure counterparts. For more information, see Secure Template Overloads.

Generic-Text Routine Mappings

TCHAR.H routine

_UNICODE & _MBCS not defined

_MBCS defined

_UNICODE defined

_ultot_s

_ultoa_s

_ultoa_s

_ultow_s

Routine

Required header

_ultoa_s

<stdlib.h>

_ultow_s

<stdlib.h>

For additional compatibility information, see Compatibility in the Introduction.

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