Writing to CON (Windows console) doesn't print to STDOUT (console)

Question

I understood that the CON name is equivalent to /dev/tty in Linux.
But when I used a program that write to this file, it doesn't print anything, it works only on Linux.
I think I am not using it correctly.
IMPORTANT: I am not looking for workarounds like fmt.Println, I need to be able to print to this file, like I did in Linux (/dev/tty).

This is the program:

package main

import (
    "fmt"
    "os"
    "runtime"
)


func main() {

    var ttyName string
    if runtime.GOOS == "windows" {
        fmt.Println("*** Using `con`")
        ttyName = "con"
    } else {
        fmt.Println("*** Using `/dev/tty`")
        ttyName = "/dev/tty"
    }

    f, _ := os.OpenFile(ttyName, os.O_WRONLY, 0644)

    fmt.Fprintln(f, "*** Stdout redirected")
}   

The program prints "*** Stdout redirected" in Linux but not in Windows.
The problem is related to the ttyName.
I used con as the name but it seems that it doesn't work.
I also tried: "con:", "\\\\.\\con", "\\\\.\\con:", "\\\\?\\con", and conout.

How can I use it to print to the console?

I took some of the ideas from this website:
https://www.mkssoftware.com/docs/man5/dev_console.5.asp

Answer 1

Make sure you test this with Windows Command Prompt as CON might not work as expected with 3rd party terminal emulators (like embedded ones in IDE, Hyper.js, etc.).

Options you listed should work, CON (legacy DOS name) or \\.\CON (UNC name) in uppercase are safe bet:

f, _ := os.OpenFile("CON", os.O_WRONLY, 0644) 
f, _ := os.OpenFile("\\\\.\\CON", os.O_WRONLY, 0644)