main-extended.go

// MSG see https://docs.microsoft.com/en-us/windows/win32/api/winuser/ns-winuser-msg
type MSG struct {
	HWND   uintptr
	UINT   uintptr
	WPARAM int16
	LPARAM int64
	DWORD  int32
	POINT  struct{ X, Y int64 }
}


func main() {
	user32 := syscall.MustLoadDLL("user32")
	defer user32.Release()

	registerHotkeys(user32)
	getmsg := user32.MustFindProc("GetMessageW")

	sendInputProc := user32.MustFindProc("SendInput")

	for {
		var msg = &MSG{}
		getmsg.Call(uintptr(unsafe.Pointer(msg)), 0, 0, 0, 1)

		// Registered id is in the WPARAM field:
		if id := msg.WPARAM; id != 0 {
			fmt.Println("Hotkey pressed:", HOTKEYS[id])
			PrintCharacters(sendInputProc, strings.ToUpper(time.Now().Format("2006-01-02")))
		}
	}
}