宽字符串:CString，字符串 [英] wide string: CString, string

问题描述

// unicode project
CString str;
string s;
...
str.Format(L"..%s", s.c_str());

这会工作吗?我不确定我的代码是否在这里错误，但是str是垃圾字符串.
预先感谢.

Will this work? I''m not sure if my codes are wrong here but str is a garbage string.
Thanks in advance.

推荐答案

不.但是，您可以使用%S(大写S)格式说明符，例如

Nope. However you may use the %S (uppercase S) format specifier, e.g.

std::string s = "foo";
CString str;
str.Format(L"%S", s.c_str());

我相信CString的格式期望其字符串参数为"T-String"(如果使用非unicode和"wchar_t *"，则为"char *"，如果您在项目的设置中使用的是unicode).从您使用宽字符串作为格式字符串这一事实出发，您正在使用unicode进行构建(啊，您甚至在我最初没有注意到的注释中显示了这一点).我的猜测是您会产生垃圾，因为％s希望获取一个宽字符串作为参数，但是您要用ansii-string进行输入.您可以尝试将s替换为std::wstinrg而不是string.

I believe CString''s Format expects its string parameters to be a "T-String" (which is "char*" if you use non-unicode and "wchar_t *" or somesuch if you are using unicode in the project''s settings). Concluding from the fact that you used a wide-string as the format string, you are building with unicode (ah, and you even show that in a comment which i didn''t notice at first). My guess is that you get garbage because %s expects to get a wide string as parameter but you are feeding it with an ansii-string. You could try making s an std::wstinrg instead of string.

如其他解决方案中所述，您正在传递带有格式说明符的char字符串，该说明符要求传递一个宽弦.要将单个字符字符串与宽格式字符串一起使用，请使用％hs"格式说明符:

As already noted in the other solutions, you are passing a char string with a format specifier that requires passing a wide string. To use single char strings with wide format strings, use the ''%hs'' format specifier:

CString str;
LPCSTR lpszAnsi = "single char string";
LPCWSTR lpszWide = L"Unicode string";
str.Format(_T("%hs %ls"), lpszAnsi, lpszUnicode);

无论Unicode项目设置如何，该示例始终可以使用.

This example will always work regardless of the Unicode project setting.

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