Why are certain Unicode characters causing std::wcout to fail in a console app?

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wcout, or to be precise, a wfilebuf instance it uses internally, converts wide characters to narrow characters, then writes those to the file (in your case, to stdout). The conversion is performed by the codecvt facet in the stream’s locale; by default, that just does wctomb_s, converting to the system default ANSI codepage, aka CP_ACP.

Apparently, character '\xf021' is not representable in the default codepage configured on your system. So the conversion fails, and failbit is set in the stream. Once failbit is set, all subsequent calls fail immediately.

I do not know of any way to get wcout to successfully print arbitrary Unicode characters to console. wprintf works though, with a little tweak:

#include <fcntl.h>
#include <io.h>
#include <string>

const std::wstring test = L"hello\xf021test!";

int _tmain(int argc, _TCHAR* argv[])
{
  _setmode(_fileno(stdout), _O_U16TEXT);
  wprintf(test.c_str());

  return 0;
}

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