Unicode output on windows console - c++

Question

The article Unicode apps in the MinGW-w64 wiki explains the following example for an Unicode application, e.g. _main.c_:
#define UNICODE
#define _UNICODE
#include <tchar.h>
int _tmain(int argc, TCHAR * argv[])
{
_tprintf(argv[1]);
return 0;
}
The above code makes use of tchar.h mapping, which allows it to both compile in Unicode and non-Unicode mode. [...] The -municode option is still required when linking if Unicode mode is used.
So I used
C:\> i686-w64-mingw32-gcc main.c -municode -o hello
_tmain.c:1:0: warning: "UNICODE" redefined
#define UNICODE
^
<command-line>:0:0: note: this is the location of the previous definition
to compile a Unicode application. But, when I run it, it returns
C:\> hello Süßer
S³▀er
So the Unicode string is wrong. I used the latest version 4.9.2 of MinGW-w64, i686 architecture and tried the Win32 and POSIX theads variants, both result in the same error. My operating system is 32-bit German Windows 7. When I used the Unicode codepage (chcp 65001), I have to use the font "Lucida Console". With this setting I get a similar error:
C:\> hello Süßer
S��er
I want to use a parameter with "ü" or "ß" in a Windows C++ program.
Solution
nwellnhof is right: The problem is the output on the console. This problem is explained in Unicode part 1: Windows console i/o approaches und Unicode part 2: UTF-8 stream mode. The latter gives a solution for Visual C++ - it worked also with Intel C++ 15. This blog post does "not yet consider the g++ compiler. All this code is Visual C++ specific. However, [the blog author has] done generally the same with g++, and [he] will probably discuss that in a third installment."
I want to open a file, which name is given by a parameter. This works simple, e. g. main.c:
#include <iostream>
#include <fstream>
using namespace std;
int main(int argc, char* argv[])
{
if ( argc > 1 ) {
// The output will be wrong, ...
cout << argv[1] << endl;
// but the name of this file will be right:
fstream fl_rsl(argv[1], ios::out);
fl_rsl.close();
}
return 0;
}
and the compilation without unicode mode
C:\> g++ main.cpp -o hello && hello Süßer
It's console output is still wrong, but the created filename is right. This is okay for me.