转换16进制字符串为整数 C++ hexidecimal string to integer/long

strtol:convert strings to a long-integer value.
strtod: Convert strings to a double-precision value.

long strtol( const char *nptr, char **endptr, int base ); long wcstol( const wchar_t *nptr, wchar_t **endptr, int base ); long _strtol_l( const char *nptr, char **endptr, int base, _locale_t locale ); long _wcstol_l( const wchar_t *nptr, wchar_t **endptr, int base, _locale_t locale );

double strtod(
  const char *nptr,
  char **endptr
);
double _strtod_l(
  const char *nptr,
  char **endptr,
  _locale_t locale
);
double wcstod(
  const wchar_t *nptr,
  wchar_t **endptr
);
double wcstod_l(
  const wchar_t *nptr,
  wchar_t **endptr,
  _locale_t locale
);

Routine	Required header
strtol,__strtol_l strtod, _strtod_l
wcstol, wcstod, _wcstod_l	or