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Data Conversion

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Windows Mobile Not SupportedWindows Embedded CE Supported

8/27/2008

Data conversion routines convert data from one form to another. Generally these routines execute faster than conversions you might write. Each routine that begins with a to prefix is implemented as a function and as a macro.

For detailed reference information about the CRT functions, see Alphabetical Function Reference (CRT).

Routine Use

abs

Finds absolute value of integer

atof

Converts string to float

atoi

Converts string to int

atol, wtol

Converts string to long

_ecvt

Converts double to string of specified length.

This function is deprecated because a more secure version is available.

_ecvt_s

Converts a double number to a string.

Security-enhanced version of deprecated function _ecvt. Validates parameters and sets errno. Template overload available.

_fcvt

Converts double to string with specified number of digits following decimal point.

This function is deprecated because a more secure version is available.

_fcvt_s

Converts a floating-point number to a string.

Security-enhanced version of deprecated function _fcvt. Validates parameters and sets errno. Template overload available.

_gcvt

Converts double number to string; store string in buffer.

This function is deprecated because a more secure version is available.

_gcvt_s

Converts a floating-point value to a string.

Security-enhanced version of deprecated function _gcvt. Validates parameters and sets errno. Template overload available.

_itoa, _itow

Converts int to string.

These functions have been deprecated because security enhanced versions, _itoa_s and _itow_s, now exist.

_itoa_s, _itow_s

Converts an integer to a string.

Security-enhanced versions of deprecated functions _itoa and _itow. Validates parameters and sets errno. Template overload available.

Windows Embedded CE 6.0 does not support forms of this function that convert int64 values, _i64toa_s, _ui64toa_s, _i64tow_s, and _ui64tow_s.

labsf

Finds absolute value of long integer

_ltoa, _ltow

Converts long to string.

These functions have been deprecated because security enhanced versions, _ltoa_s and _ltow_s, now exist.

_ltoa_s, _ltow_s

Converts a long integer to a string.

Security-enhanced versions of deprecated functions _ltoa and _ltow. Validates parameters, won't write past end of buffer.

mbstowcs

Converts a sequence of multibyte characters to a corresponding sequence of wide characters.

This function is deprecated because a more secure version is available.

mbstowcs_s

Converts a sequence of multibyte characters to a corresponding sequence of wide characters.

Security-enhanced version of deprecated function mbstowcs. Takes a buffer size and won't write past end of buffer. Template overload available.

Windows Embedded CE 6.0 does not support the form of this function that uses the Locale parameter, _mbstowcs_s_l.

strtod, wcstod

Converts string to double

strtol, wcstol

Converts string to long integer

strtoul, wcstoul

Converts string to unsigned long integer

towlower

Tests character and converts to lowercase if currently uppercase

towupper

Tests character and converts to uppercase if currently lowercase

_ultoa, _ultow

Converts unsigned long to string.

These functions have been deprecated because security-enhanced versions, _ultoa_s and _ultow_s, now exist

_ultoa_s, _ultow_s

Converts an unsigned long integer to a string.

Security-enhanced versions of deprecated functions _ultoa and _ultow. Sets errno, template overload available.

wcstombs

Converts wide character to corresponding multi-byte character

_wtoi

Converts wide-character string to integer

See Also

Other Resources

C/C++ Libraries for Windows Embedded CE
What's New in the C Run-Time Library