如何在C ++中将文件编码格式设置为UTF8 [英] How to set file encoding format to UTF8 in C++

问题描述

我的软件的要求是，包含导出数据的文件的编码应为UTF8。但是当我将数据写入文件时，编码始终是ANSI。 （我使用Notepad ++来检查这一点。）

我现在正在做的是尝试手动转换文件，读取它，将其转换为UTF8，一个新文件。

行是 std :: string

inputFile 是 std :: ifstream

pOutputFile 是 FILE *

  // ... 
 
 if（inputFile.is_open（））
 {
 while（inputFile.good（））
 {
 getline（inputFile，line）; 
 
 // 1 
 DWORD dwCount = MultiByteToWideChar（CP_ACP，0，line.c_str（），-1，NULL，0）; 
 wchar_t * pwcharText; 
 pwcharText = new wchar_t [dwCount]; 
 
 // 2 
 MultiByteToWideChar（CP_ACP，0，line.c_str（），-1，pwcharText，dwCount）; 
 
 // 3 
 dwCount = WideCharToMultiByte（CP_UTF8，0，pwcharText，-1，NULL，0，NULL，NULL）; 
 char * pText; 
 pText = new char [dwCount]; 
 
 // 4 
 WideCharToMultiByte（CP_UTF8，0，pwcharText，-1，pText，dwCount，NULL，NULL）; 
 
 fprintf（pOutputFile，pText）; 
 fprintf（pOutputFile，\\\
）; 
 
 delete [] pwcharText; 
 delete [] pText; 
} 
} 
 
 // ... 
  

不幸的是，编码仍然是ANSI。我搜索一段时间的解决方案，但我总是遇到解决方案通过MultiByteToWideChar和WideCharToMultiByte。然而，这似乎不工作。

我也在这里看到一个解决方案，但大多数UTF8问题处理C＃和PHP的东西。

<在VC ++ 2010中的Windows是可能的（迄今为止还没有实现在GCC，据我所知）使用本地化facet std :: codecvt_utf8_utf16（即在C ++ 11）。 cppreference.com 的示例代码提供了您需要阅读/写UTF-8文件。

  std :: wstring wFromFile = _T（
A requirement for my software is that the encoding of a file which contains exported data shall be UTF8. But when I write the data to the file the encoding is always ANSI. (I use Notepad++ to check this.)

What I'm currently doing is trying to convert the file manually by reading it, converting it to UTF8 and writing the text to a new file.

line is a std::string

inputFile is an std::ifstream

pOutputFile is a FILE*  
// ...

if( inputFile.is_open() )
{
    while( inputFile.good() )
    {
        getline(inputFile,line);

        //1
        DWORD dwCount = MultiByteToWideChar( CP_ACP, 0, line.c_str(), -1, NULL, 0 );
        wchar_t *pwcharText;
        pwcharText = new wchar_t[ dwCount];

        //2
        MultiByteToWideChar( CP_ACP, 0, line.c_str(), -1, pwcharText, dwCount );

        //3
        dwCount = WideCharToMultiByte( CP_UTF8, 0, pwcharText, -1, NULL, 0, NULL, NULL );
        char *pText;
        pText = new char[ dwCount ];

        //4
        WideCharToMultiByte( CP_UTF8, 0, pwcharText, -1, pText, dwCount, NULL, NULL );

        fprintf(pOutputFile,pText);
        fprintf(pOutputFile,"\n");

        delete[] pwcharText;
        delete[] pText;
    }
}

// ...
Unfortunately the encoding is still ANSI. I searched a while for a solution but I always encounter the solution via MultiByteToWideChar and WideCharToMultiByte. However, this doesn't seem to work. What am I missing here?

I also looked here on SO for a solution but most UTF8 questions deal with C# and php stuff.
解决方案
On Windows in VC++2010 it is possible (not yet implemented in GCC, as far as i know) using localization facet std::codecvt_utf8_utf16 (i.e. in C++11). The sample code from cppreference.com has all basic information you would need to read/write UTF-8 file.   
std::wstring wFromFile = _T("
                        
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