How to Print UTF-8 Strings Correctly in a Windows Console using Go?

Ensuring Proper String Output in Windows Consoles with Go

Problem:
When using a Go executable to print UTF-8 strings in a Windows console, users may encounter mangled output due to the console's default IBM850 encoding. This can lead to special characters being displayed incorrectly.

Solution:
To guarantee accurate string output in a Windows console, use the following code:

<code class="go">// Alert: This method utilizes undocumented methods and does not handle stdout redirection or error checking.
// Use with caution.

package main

import (
    "syscall"
    "unicode/utf16"
    "unsafe"
)

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

func consolePrintString(strUtf8 string) {
    strUtf16 := utf16.Encode([]rune(strUtf8))
    if len(strUtf16) == 0 {
        return
    }

    var charsWritten *uint32
    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")
}</code>

This code uses undocumented Windows API functions to write UTF-16 encoded strings directly to the console, bypassing the default encoding. This approach ensures that special characters are displayed correctly.

Usage:
In your Go program, you can directly call the consolePrintString function to print UTF-8 encoded strings that will be properly displayed in the Windows console.

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