WCHAR and wchar_t 的区别 (zz)

//z 2012-6-28 16:31:32 PM is2120@csdn

在定义了unicode的情况下，wsprintf的格式字符串

c	A single character. This sequence is interpreted as type WCHAR.
C	A single character. This sequence is interpreted as type CHAR.

Q:I was wondering if there was any practical difference between WCHAR and wchar_t.

A:

Well, one practical difference would be that

WCHAR

doesn't exist on my platform. For Windows only (and with no intention of ever porting the program to another platform) and with the necessary headers included, it's the same (since

WCHAR

is just a

typedef

).

wchar_t is a distinct type, defined by the C++ standard.

WCHAR is nonstandard, and as far as I know, exists only on Windows. However, it is simply a typedef (or possibly a macro) for wchar_t, so it makes no practical difference.

Older versions of MSVC did not have wchar_t as a first-class type, instead of was simply a typedef for

short

Most likely, they introduced WCHAR to represent "wide character type" across any compiler version, whether or not wchar_t exists as a native type.

You should use wchar_t in your code though. That's what it's for.

//z 2012-6-28 16:31:32 PM is2120@csdn

//z 2012-12-03 10:36:01 IS2120@BG57IV3.T3905646052.K[T42,L399,R15,V371]

_T _TEXT L
有什么区别

_T("Text") is a narrow-character (ASCII) literal in an ANSI build but a wide character (UNICODE) literal in a Unicode build.
L"Text" is always a wide-character literal, regardless of preprocessor definitions.
_T() is a macro, the L prefix is part of the core C and C++ language lexical structure.