数据转换

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字符串转数字

1．CRT函数

ASCII

UNICODE

TCHAR

VS2005

int

atoi

_wtoi

_tstoi

_ttoi

_atoi_l

_wtoi_l

long

atol

_wtol

_tstoi

_ttoi

_atoi_l

_wtoi_l

__int64

_atoi64

_wtoi64

_tstoi64

_ttoi64

_atoi64_l

_wtoi64_l

float

_atoflt

_atoflt_l

double

atof

_wtof

_tstof

_ttof

_atof_l

_wtof_l

_atodbl

_atodbl_l

long double

_atoldbl

_atoldbl_l

2.使用sscanf

3.Windows SDK：

<shlwapi.h>：StrToInt

4.MFC/ATL：

CString::Format

数字转字符串

1.CRT函数

ASCII

UNICODE

TCHAR

VS2005

int

itoa

_itoa

_itow

_itot

long

ltoa

_ltoa

_ltow

_ltot

__int64

_i64toa

_i64tow

_i64tot

double

gcvt

_gcvt

_ecvt

_fcvt

_wtof

_tstof

_ttof

_gcvt_s

_ecvt_s

_fcvt_s

2.使用sprintf

3.<strsafe.h>：StringCbPrintf

通用相互转换方法

1.C++流方式：

stringstream

2.boost库：

boost:: lexical_cast

摘自MSDN：

Data-Conversion Routines

Routine

Use

atof, _atof_l, _wtof, _wtof_l

Convert string to float

atoi, _atoi_l, _wtoi, _wtoi_l

Convert string to int

_atoi64, _atoi64_l, _wtoi64, _wtoi64_l

Convert string to __int64

atol, _atol_l, _wtol, _wtol_l

Convert string to long

_ecvt, _ecvt_s

Convert double to string of specified length

_fcvt, _fcvt_s

Convert double to string with specified number of digits following decimal point

_gcvt, _gcvt_s

Convert double number to string; store string in buffer

_itoa, _i64toa, _ui64toa, _itow, _i64tow, _ui64tow, _itoa_s, _i64toa_s, _ui64toa_s, _itow_s, _i64tow_s, _ui64tow_s

Convert int or __int64 to string

_ltoa, _ltow, _ltoa_s, _ltow_s

Convert long to string

strtod, _strtod_l, wcstod, _wcstod_l

Convert string to double

strtol, wcstol, _strtol_l, _wcstol_l

Convert string to long integer

strtoul, _strtoul_l, wcstoul, _wcstoul_l

Convert string to unsigned long integer

_ultoa, _ultow, _ultoa_s, _ultow_s

Convert unsigned long to string

atof, _atof_l, _wtof, _wtof_l

Convert wide-character string to a double

atoi, _atoi_l, _wtoi, _wtoi_l

Convert wide-character string to int

_atoi64, _atoi64_l, _wtoi64, _wtoi64_l

Convert wide-character string to __int64

atol, _atol_l, _wtol, _wtol_l

Convert wide-character string to long

例如：

TCHAR a[10];
_ttoi(a);
_itoa(100, a, 10);

_itoa_s(100, a, strlen(a), 10);

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