[英]C++ Using std::string functions for MBCS and std::wstring functions for UTF-16
Has anyone dealt with using std::string functions for MBCS? 有人处理过MBCS使用std :: string函数吗? For example in CI could do this:
例如,在CI中可以做到这一点:
p = _mbsrchr(path, '\\');
but in C++ I'm doing this: 但是在C ++中,我正在这样做:
found = path.find_last_of('\\');
If the trail byte is a slash then would find_last_of stop at the trail byte? 如果跟踪字节是斜杠,那么find_last_of会在跟踪字节处停止吗? Also same question for std::wstring.
同样对于std :: wstring的问题。
If I need to replace all of one character with another, say all forward slashes with backslashes what would be the right way to do that? 如果我需要将一个字符的所有字符替换为另一个字符,请用反斜杠说所有正斜杠,这样做的正确方法是什么? Would I have to check each character for a lead surrogate byte and then skip the trail?
我是否需要检查每个字符的前导代理字节,然后跳过跟踪? Right now I'm doing this for each wchar:
现在,我正在为每个wchar这样做:
if( *i == L'/' )
*i = L'\\';
Thanks 谢谢
Edit: As David correctly points out there is more to deal with when working with multibyte codepages. 编辑:正如David正确指出的那样,在处理多字节代码页时还有更多需要处理的内容。 Microsoft says use _mbclen for working with byte indices and MBCS.
微软表示使用_mbclen处理字节索引和MBCS。 It does not appear I can use find_last_of reliably when working with the ANSI codepages.
在使用ANSI代码页时,似乎无法可靠地使用find_last_of。
You don't need to do anything special about surrogate pairs. 您不需要对代理对做任何特别的事情。 A single 16 bit character unit that is one half of a surrogate pair, cannot also be a non-surrogate character unit.
代理对的一半的单个16位字符单元也不能是非代理字符单元。
So, 所以,
if( *i == L'/' )
*i = L'\\';
is perfectly correct. 是完全正确的。
Equally you can use find_last_of
with wstring
. 同样,您可以将
find_last_of
与wstring
find_last_of
使用。
It's more complicated for multi-byte ANSI codepages. 对于多字节ANSI代码页而言,它更为复杂。 You do need to deal with lead and trail byte issues.
您确实需要处理前导和尾部字节问题。 My recommendation is to normalise to a more reasonable encoding if you really have to deal with multi-byte ANSI date.
我的建议是,如果您确实需要处理多字节ANSI日期,请标准化为更合理的编码。
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