Read Go

package main

import (
	"fmt"
	"os"
	"unicode/utf16"
)

/*
#include <Windows.h>
KEY_EVENT_RECORD* getKeyEvent(struct _INPUT_RECORD *input) {
	return &(input->Event.KeyEvent);
}
char getAsciiChar(struct _INPUT_RECORD *input) {
	return input->Event.KeyEvent.uChar.AsciiChar;
}
WCHAR getUnicodeChar(struct _INPUT_RECORD *input) {
	return input->Event.KeyEvent.uChar.UnicodeChar;
}
*/
import "C"
 
var InputFD C.HANDLE
var oldInputState, lastInputState C.DWORD
 
func main() {
	InputFD = C.GetStdHandle(C.STD_INPUT_HANDLE)
	if C.GetConsoleMode(InputFD, &lastInputState) == 0 {
		ErrorExit("GetConsoleMode", C.GetLastError())
	}
 
	lastInputState &^= C.ENABLE_WINDOW_INPUT | C.ENABLE_MOUSE_INPUT
 
	if C.SetConsoleMode(InputFD, lastInputState) == 0 {
		ErrorExit("SetConsoleMode", C.GetLastError())
	}
 
	var input C.struct__INPUT_RECORD
	var numEvents C.DWORD
 
	fmt.Println("Press key:")
 
	// Error checking
	if C.ReadConsoleInput(InputFD, &input, 0, &numEvents) == 0 {
		ErrorExit("ReadConsoleInput", C.GetLastError())
	}
 
L:
	for {
		C.ReadConsoleInput(InputFD, &input, 1, &numEvents)
 
		if input.EventType != C.KEY_EVENT || C.getKeyEvent(&input).bKeyDown != 0 {
			continue
		}
 
		switch C.getKeyEvent(&input).wVirtualScanCode {
		case 0x0D: // RETURN key (VK_RETURN)
			break L
		case 0x08: // BACKSPACE key (VK_BACK)
			continue
		case 0x43: // C key
			if C.GetKeyState(0x11) < 0 { // CTRL key is pressed (VK_CONTROL)
				fmt.Println("CTRL-C pressed")
				break L
			}
		}
 
		aChar := C.getAsciiChar(&input)
		if aChar == 0 {
			continue
		}
 
		uChar := C.getUnicodeChar(&input)
		runes := utf16.Decode([]uint16{uint16(uChar)})
 
		fmt.Printf("ascii: %c : unicode: %c : rune : %v\n", aChar, uChar, string(runes[0]))
	}
 
	C.SetConsoleMode(InputFD, oldInputState)
}
 
func ErrorExit(errMsg string, err C.DWORD) {
	fmt.Fprintf(os.Stderr, "%d\n", err) // Use C.FormatMeessage to get human readable error messages
	C.SetConsoleMode(InputFD, oldInputState)
	os.Exit(1)
}