在MSVC ++ 2010中禁用警告 [英] Disable warning in MSVC++2010

问题描述

我有以下代码：

/** Stupidly copies unicode chars into normal chars. */
std::string wstring2string(__in  const std::wstring& s)
{
    std::string temp(s.length(), ' ');
#pragma warning(push)
#pragma warning(disable: 4244) // possible loss of data
    std::copy(s.begin(), s.end(), temp.begin());
#pragma warning(pop)
    return temp;
}

我的编译器仍会显示警告C4244： / p>

My compiler still shows me warning C4244:

1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(2144): warning C4244: '=': Konvertierung von 'const wchar_t' in 'char', möglicher Datenverlust
1>          c:\program files\microsoft visual studio 10.0\vc\include\xutility(2165): Siehe Verweis auf die Instanziierung der gerade kompilierten Funktions-template "_OutIt std::_Copy_impl<_InIt,_OutIt>(_InIt,_InIt,_OutIt,std::_Nonscalar_ptr_iterator_tag)".

（英文：Conversion of const wchar_t 到 char ，可能会丢失数据，请参阅刚编译的函数模板的实例化...）。

(in English: "Conversion of const wchar_t to char, possible loss of data, see reference to instantiation of the just compiled function template …").

推荐答案

为了摆脱这个警告你需要添加 #pragma warning ... 包含该函数的头文件。在你的情况下，这是xutility。其中包含多个其他文件。所以很难找到。但是你可以这样尝试。

Well to get rid of this warning you need to add the #pragma warning... around your header file that includes the function. In your case this is xutility. Which is included by multiple other files. So it will be difficult to find. But you can try it this way.

#pragma warning(push)
#pragma warning(disable: 4244) // possible loss of data
#include <xutility>
#pragma warning(pop)
Your includes go here...
std::string wstring2string(__in  const std::wstring& s)
{
    std::string temp(s.length(), ' ');
    std::copy(s.begin(), s.end(), temp.begin());
    return temp;
}

除此之外，我建议正确转换。请查看 ICU ，或至少使用标准功能。例如。 mbstowcs

Beside of this I would recommend to a correct conversion. Have a look at ICU for example or at least use the function from standard. E.g. mbstowcs

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