std::wstring (from wifstream), spec. chars

Question

I need a std::wstring, from a std::wifstream, as the wifstream contains, special characters, such as: ä,ê

and, so on.

I have a code

wifstream *inFile = new wifstream(szFile);

std::wstring szwFileStr((std::istreambuf_iterator<wchar_t>(*inFile)),std::istreambuf_iterator<wchar_t>());

but, it does not read in special characters, as I am hoping it would

E.G., the file contains characters, such as ä, and ê, and they turn out as

ö

I think, the in file, is UTF-8.

Any ideas, some one? :)