如何使用std :: wifstream将其内容作为std :: wstring读取

Question

我在尝试这个:

std::wstringstream wstrStream;
std::wifstream wifStream(str.c_str());
wifStream >> wstrStream;

但我得到了这个编译错误:

     error C2664: 'std::basic_istream<_Elem,_Traits>::_Myt &std::basic_istream<_Elem,_Traits>::operator >>
(std::basic_istream<_Elem,_Traits>::_Myt &(__cdecl *)
(std::basic_istream<_Elem,_Traits>::_Myt &))' : cannot convert parameter 1 from
'std::wstringstream' to 'std::basic_istream<_Elem,_Traits>::_Myt &(__cdecl *)
(std::basic_istream<_Elem,_Traits>::_Myt &)'
            with
            [
                _Elem=wchar_t,
                _Traits=std::char_traits<wchar_t>
            ]
            and
            [
                _Elem=wchar_t,
                _Traits=std::char_traits<wchar_t>
            ]

我知道wchar_t没有实现operator >>.

我发现很少有文档和对std :: wifstream的引用.你会怎么用？

Answer 1

没有为两个流定义运算符>>.如果要从文件中读取以空格分隔的字符串,请使用

std::wstring s;
wifStream >> s;

如果您的意思是要将整个文件复制到stringstream中,请使用

wstrStream << wifStream.rdbuf();