ICODEBROKER

▶ IMEMode.cs

namespace TestProject
{
    /// <summary>
    /// IME 모드
    /// </summary>
    public enum IMEMode
    {
        /// <summary>
        /// 한글 모드
        /// </summary>
        Korean,

        /// <summary>
        /// 영문 모드
        /// </summary>
        English,

        /// <summary>
        /// 에러
        /// </summary>
        Error
    }
}

▶ IMEHelper.cs

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace TestProject
{
    /// <summary>
    /// IME 헬퍼
    /// </summary>
    public static class IMEHelper
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Import
        ////////////////////////////////////////////////////////////////////////////////////////// Static
        //////////////////////////////////////////////////////////////////////////////// Private

        #region 디폴트 IME 윈도우 구하기 - ImmGetDefaultIMEWnd(windowHandle)

        /// <summary>
        /// 디폴트 IME 윈도우 구하기
        /// </summary>
        /// <param name="windowHandle">윈도우</param>
        /// <returns>디폴트 IME 윈도우 핸들</returns>
        [DllImport("imm32.dll")]        
        private static extern IntPtr ImmGetDefaultIMEWnd(IntPtr windowHandle);

        #endregion
        #region 메시지 보내기 - SendMessage(windowHandle, message, wordParameter, longParameter)

        /// <summary>
        /// 메시지 보내기
        /// </summary>
        /// <param name="windowHandle">윈도우 핸들</param>
        /// <param name="message">메시지</param>
        /// <param name="wordParameter">WORD 매개 변수</param>
        /// <param name="longParameter">LONG 매개 변수</param>
        /// <returns>처리 결과</returns>
        [DllImport("user32.dll", CharSet = CharSet.Auto)]        
        private static extern IntPtr SendMessage(IntPtr windowHandle, uint message, IntPtr wordParameter, IntPtr longParameter);

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Field
        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region Field

        /// <summary>
        /// WM_IME_CONTROL
        /// </summary>
        private const int WM_IME_CONTROL = 643;

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Static
        //////////////////////////////////////////////////////////////////////////////// Public

        #region IME 모드 구하기 - GetIMEMode(process)

        /// <summary>
        /// IME 모드 구하기
        /// </summary>
        /// <param name="process">프로세스</param>
        /// <returns>IME 모드</returns>
        public static IMEMode GetIMEMode(Process process)
        {
            if(process == null)
            {
                return IMEMode.Error;
            }
 
            IntPtr windowHandle = process.MainWindowHandle;

            IntPtr imeDefaultWindowHandle = ImmGetDefaultIMEWnd(windowHandle);

            IntPtr status = SendMessage(imeDefaultWindowHandle, WM_IME_CONTROL, new IntPtr(0x5), new IntPtr(0));
 
            if(status.ToInt32() != 0)
            {
                return IMEMode.Korean;
            }
            else
            {
                return IMEMode.English;
            }
        }

        #endregion
    }
}

▶ Program.cs

using System;
using System.Diagnostics;
using System.Threading;

namespace TestProject
{
    /// <summary>
    /// 프로그램
    /// </summary>
    class Program
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Static
        //////////////////////////////////////////////////////////////////////////////// Private

        #region 프로그램 시작하기 - Main()

        /// <summary>
        /// 프로그램 시작하기
        /// </summary>
        private static void Main()
        {
            Process process = new Process();

            process.StartInfo.FileName  = "notepad.exe"; 
            process.StartInfo.Arguments = null;

            process.Start(); 

            process.WaitForInputIdle(100);

            while(true)
            {
                Console.WriteLine(IMEHelper.GetIMEMode(process));

                Thread.Sleep(1000);
            }
        }

        #endregion
    }
}