How to properly output a string in a Windows console with go?

Question

I have a exe in go which prints utf-8 encoded strings, with special characters in it.
Since that exe is made to be used from a console window, its output is

Answer 1

// Alert: This is Windows-specific, uses undocumented methods, does not
// handle stdout redirection, does not check for errors, etc.
// Use at your own risk.
// Tested with Go 1.0.2-windows-amd64.

package main

import "unicode/utf16"
import "syscall"
import "unsafe"

var modkernel32 = syscall.NewLazyDLL("kernel32.dll")
var procWriteConsoleW = modkernel32.NewProc("WriteConsoleW")

func consolePrintString(strUtf8 string) {
    var strUtf16 []uint16
    var charsWritten *uint32

    strUtf16 = utf16.Encode([]rune(strUtf8))
    if len(strUtf16) < 1 {
        return
    }

    syscall.Syscall6(procWriteConsoleW.Addr(), 5,
        uintptr(syscall.Stdout),
        uintptr(unsafe.Pointer(&strUtf16[0])),
        uintptr(len(strUtf16)),
        uintptr(unsafe.Pointer(charsWritten)),
        uintptr(0),
        0)
}

func main() {
    consolePrintString("Hello ☺\n")
    consolePrintString("éèïöîôùòèìë\n")
}