std::mbrtoc32
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在头文件 <cuchar> 中定义
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std::size_t mbrtoc32( char32_t* pc32, const char* s, |
(C++11 起) | |
。
一个狭窄的多字节字符转换成32位字符表示(通常情况下,UTF-32).
原文:
Converts a narrow multibyte character to its 32-bit character representation (typically, UTF-32).
。如果
s
是不是一个空指针,检查n
字节的多字节字符串的开始,指向的字节s
必要去完成下一个多字节字符(包括任何移位序列)的字节数来确定。如果该函数确定下一个多字节字符s
是完整的,有效的,将其转换到对应的32位字符,并将其存储在*pc32(如果pc32
不为null)..原文:
If
s
is not a null pointer, inspects at most n
bytes of the multibyte character string, beginning with the byte pointed to by s
to determine the number of bytes necessary to complete the next multibyte character (including any shift sequences). If the function determines that the next multibyte character in s
is complete and valid, converts it to the corresponding 32-bit character and stores it in *pc32 (if pc32
is not null).。如果多字节字符
*s
对应于多char32_t序列(不可能与UTF-32)后,然后给该函数的第一呼叫,*ps
更新在这样一种方式,下一个呼叫mbrtoc32
将写出来的额外char32_t ,而不考虑*s
.原文:
If the multibyte character in
*s
corresponds to a multi-char32_t sequence (not possible with UTF-32), then after the first call to this function, *ps
is updated in such a way that the next calls to mbrtoc32
will write out the additional char32_t, without considering *s
.。
s
是一个空指针,n
和pc32
将被忽略,并且调用相当于std::mbrtoc32(NULL, "", 1, ps).原文:
If
s
is a null pointer, the values of n
and pc32
are ignored and the call is equivalent to std::mbrtoc32(NULL, "", 1, ps).。如果宽字符是空字符,的转换状态*ps代表的初始移位状态.
原文:
If the wide character produced is the null character, the conversion state *ps represents the initial shift state.
。如果宏__STDC_UTF_32__的定义,使用此功能的32位编码是UTF-32,否则它是实现定义.
原文:
If the macro __STDC_UTF_32__ is defined, the 32-bit encoding used by this function is UTF-32, otherwise it is implementation-defined.
[编辑] 。参数。
pc32 | - | 。得到的32位的字符将被写入的位置的指针。
原文: pointer to the location where the resulting 32-bit character will be written |
s | - | 。指针的多字节字符串作为输入。
原文: pointer to the multibyte character string used as input |
n | - | 。限制的字节数,可以检查。
原文: limit on the number of bytes in s that can be examined |
ps | - | 。解释的多字节字符串时使用的转换状态对象的指针。
原文: pointer to the conversion state object used when interpreting the multibyte string |
===。 返回值。===
。以下适用:第一。
原文:
The first of the following that applies:
- 。 0如果从
s
(字符转换,并存储在*pc32如果非空)是空字符。原文:0 if the character converted froms
(and stored in *pc32 if non-null) was the null character - 。从[1...n]成功转换的多字节字符的字节数
s
。原文:the number of bytes [1...n] of the multibyte character successfully converted froms
- 。 -3如果从多char32_t字符的下一个char32_t现已写入*pc32。在这种情况下,从输入处理无字节.原文:-3 if the next char32_t from a multi-char32_t character has now been written to *pc32. No bytes are processed from the input in this case.
- 。 -2
n
如果下一个字节构成一个不完整的,但到目前为止,有效的多字节字符。没有被写入*pc32.原文:-2 if the nextn
bytes constitute an incomplete, but so far valid, multibyte character. Nothing is written to *pc32. - 。 -1如果出现编码错误。没有被写入
*pc32
,EILSEQ存储在errno是不确定的值,如果*ps.原文:-1 if encoding error occurs. Nothing is written to*pc32
, the value EILSEQ is stored in errno and the value if *ps is unspecified.
[编辑] 。另请参阅。
(C++11) |
一个32位的宽字符转换成多字节字符串缩小 原文: convert a 32-bit wide character to narrow multibyte string (函数) |
[虚]</div></div>
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将字符串转换,如从文件读取时,从externT到Internt的 原文: converts a string from externT to internT, such as when reading from file (虚拟保护成员函数of std::codecvt )
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C documentation for mbrtoc32
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