Security-Enhanced Versions of CRT Functions

More secure versions of run-time library routines are available. For further information concerning Security Enhancements in the CRT, see Security Features in the CRT.

Secure Functions

Function	Use	.NET Framework equivalent
_access_s, _waccess_s	Determine file-access permission	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_malloca	Allocates memory on the stack	Not applicable
asctime_s, _wasctime_s	Convert time from type struct tm to character string	System::DateTime::ToLongDateString, System::DateTime::ToLongTimeString, System::DateTime::ToShortDateString, System::DateTime::ToShortTimeString, System::DateTime::ToString
bsearch_s	Performs a binary search of a sorted array	BinarySearch
_cgets_s, _cgetws_s	Get a character string from the console	Not applicable
_chsize_s	Changes the size of a file	System::IO::Stream::SetLength¸ System::IO::FileStream::SetLength
clearerr_s	Resets the error indicator for a stream	Not applicable
_controlfp_s	Get and set the floating-point control word	Not applicable
_cprintf_s, _cprintf_s_l, _cwprintf_s, _cwprintf_s_l	Formats and prints to the console	Not applicable
_cscanf_s, _cscanf_s_l, _cwscanf_s, _cwscanf_s_l	Reads formatted data from the console	Not applicable
_ctime_s, _ctime32_s, _ctime64_s, _wctime_s, _wctime32_s, _wctime64_s	Convert time from type time_t, __time32_t or __time64_t to character string	System::DateTime::GetDateTimeFormats, System::DateTime::ToString, System::DateTime::ToLongTimeString, System::DateTime::ToShortTimeString
_ecvt_s	Converts a double number to a string	System::Convert::ToString
_fcvt_s	Converts a floating-point number to a string	ToString
fopen_s, _wfopen_s	Open a file	System::IO::File::Open, System::IO::FileStream::FileStream
fprintf_s, _fprintf_s_l, fwprintf_s, _fwprintf_s_l	Print formatted data to a stream	System::IO::StreamWriter::Write
freopen_s, _wfreopen_s	Reassign a file pointer	System::IO::File::Open, System::IO::FileStream::FileStream
fscanf_s, _fscanf_s_l, fwscanf_s, _fwscanf_s_l	Read formatted data from a stream	System::IO::StreamReader::ReadLine. See also Parse methods, such as System::Double::Parse
_ftime_s, _ftime32_s, _ftime64_s	Get the current time	System::DateTime::Now
_gcvt_s	Converts a floating-point value to a string, which it stores in a buffer	ToString
getenv_s, _wgetenv_s	Get a value from the current environment.	System::Environment::GetEnvironmentVariable
gets_s, _getws_s	Get a line from the stdin stream	System::Console::Read
_gmtime32_s, _gmtime64_s	Convert time from type time_t to structtm or from type __time64_t to struct tm	System::DateTime::UtcNow, System::DateTime::ToUniversalTime
_itoa_s, _i64toa_s, _ui64toa_s, _itow_s, _i64tow_s, _ui64tow_s	Convert an integer to a string	System::Convert::ToString
_lfind_s	Performs a linear search for the specified key	System::Collections::ArrayList::Contains
localtime_s, _localtime32_s, _localtime64_s	Convert time from type time_t to struct tm or from type __time64_t to struct tmwith local correction	System::DateTime::ToLocalTime
_lsearch_s	Performs a linear search for a value; adds to end of list if not found	Not applicable
_ltoa_s, _ltow_s	Convert a long integer to a string	System::Convert::ToString
_makepath_s, _wmakepath_s	Create a path name from components	System::IO::File::Create
_mbccpy_s, _mbccpy_s_l	Copies a multibyte character from one string to another string	Not applicable
_mbsnbcat_s, _mbsnbcat_s_l	Appends, at most, the first n bytes of one multibyte character string to another	Not applicable
_mbsnbcpy_s, _mbsnbcpy_s_l	Copies n bytes of a string to a destination string	Not applicable
mbsrtowcs_s	Converts a multibyte character string to a corresponding wide characters string	Not applicable
mbstowcs_s, _mbstowcs_s_l	Converts a sequence of multibyte characters to a corresponding sequence of wide characters	Not applicable
memcpy_s, wmemcpy_s	Copies characters between buffers	Not applicable
memmove_s, wmemmove_s	Moves one buffer to another	Not applicable
_mktemp_s, _wmktemp_s	Create a unique filename	Not applicable
printf_s, _printf_s_l, wprintf_s, _wprintf_s_l	Print formatted output to the standard output stream	System::Console::Write, System::Console::WriteLine
_putenv_s, _wputenv_s	Create, modify, or remove environment variables	Not applicable
qsort_s	Performs a quick sort	System::Collections::ArrayList::Sort
rand_s	Generates a pseudorandom number	System::Random Class
scanf_s, _scanf_s_l, wscanf_s, _wscanf_s_l	Read formatted data from the standard input stream	System::Console::Read, System::Console::ReadLine, see also Parse methods, such as System::Double::Parse
_searchenv_s, _wsearchenv_s	Search for a file using environment paths	Not applicable
_snprintf_s, _snprintf_s_l, _snwprintf_s, _snwprintf_s_l	Write formatted data to a string	Not applicable
_snscanf_s, _snscanf_s_l, _snwscanf_s, _snwscanf_s_l	Read formatted data of a specified length from a string.	Not applicable
_sopen_s, _wsopen_s	Open a file for sharing	Not applicable
_splitpath_s, _wsplitpath_s	Break a path name into components	Not applicable
sprintf_s, _sprintf_s_l, swprintf_s, _swprintf_s_l	Write formatted data to a string	System::String::Format
sscanf_s, _sscanf_s_l, swscanf_s, _swscanf_s_l	Read formatted data from a string	See Parse methods, such as System::Double::Parse
strcat_s, wcscat_s, _mbscat_s	Append a string	System::String::Concat
strcpy_s, wcscpy_s, _mbscpy_s	Copy a string	System::String::Copy
_strdate_s, _wstrdate_s	Return current system date as string	System::DateTime::Parse
strerror_s, _strerror_s, _wcserror_s, __wcserror_s	Get a system error message (strerror, _wcserror) or prints a user-supplied error message (_strerror, __wcserror)	System::Exception::Message
_strlwr_s, _strlwr_s_l, _mbslwr_s, _mbslwr_s_l, _wcslwr_s, _wcslwr_s_l	Convert a string to lowercase	System::String::ToLower
strncat_s, _strncat_s_l, wcsncat_s, _wcsncat_s_l, _mbsncat_s, _mbsncat_s_l	Append characters to a string	System::String::Concat
strncpy_s, _strncpy_s_l, wcsncpy_s, _wcsncpy_s_l, _mbsncpy_s, _mbsncpy_s_l	Copy characters of one string to another	System::String::Copy
_strtime_s, _wstrtime_s	Return current system time as string	System::DateTime::ToLongDateString, System::DateTime::ToLongTimeString, System::DateTime::ToShortDateString, System::DateTime::ToShortTimeString, System::DateTime::ToString
strtok_s, _strtok_s_l, wcstok_s, _wcstok_s_l, _mbstok_s, _mbstok_s_l	Find the next token in a string, using the current locale or a locale passed in	Not applicable
_strupr_s, _strupr_s_l, _mbsupr_s, _mbsupr_s_l, _wcsupr_s, _wcsupr_s_l	Convert a string to uppercase	System::String::ToUpper
tmpfile_s	Creates a temporary file	Not applicable
tmpnam_s, _wtmpnam_s	Generate names you can use to create temporary files	Not applicable
_ultoa_s, _ultow_s	Convert an unsigned long integer to a string	System::Convert::ToString
_umask_s	Sets the default file-permission mask	System::IO::File::SetAttributes
_vcprintf_s, _vcprintf_s_l, _vcwprintf_s, _vcwprintf_s_l	Write formatted output to the console using a pointer to a list of arguments	System::Console::Write
vfprintf_s, _vfprintf_s_l, vfwprintf_s, _vfwprintf_s_l	Write formatted output using a pointer to a list of arguments	Not applicable
vprintf_s, _vprintf_s_l, vwprintf_s, _vwprintf_s_l	Write formatted output using a pointer to a list of arguments	System::Console::Write
vsnprintf_s, _vsnprintf_s, _vsnprintf_s_l, _vsnwprintf_s, _vsnwprintf_s_l	Write formatted output using a pointer to a list of arguments	Not applicable
vsprintf_s, _vsprintf_s_l, vswprintf_s, _vswprintf_s_l	Write formatted output using a pointer to a list of arguments	System::String::Format
wcrtomb_s	Convert a wide character into its multibyte character representation	Not applicable
wcsrtombs_s	Convert a wide character string to its multibyte character string representation	Not applicable
wcstombs_s, _wcstombs_s_l	Converts a sequence of wide characters to a corresponding sequence of multibyte characters	Not applicable
wctomb_s, _wctomb_s_l	Converts a wide character to the corresponding multibyte character	Not applicable

See Also

Reference

C Run-Time Libraries