[C#] Form App 의 System Menu에 사용자 메뉴 추가하기

C#의 Windows Form Application에서 System 메뉴에 사용자 메뉴를 추가하는 방법이다. 인터넷을 통해 알게된 방법으로 Add System Menu Items to a Form using Windows API 글을 보고 알게 되었다. C# 에서의 Win32 API 사용과 메세지 핸들링에 대한 지식을 알고 있어야 겠다. C++에서는 API 사용이 쉬웠는데 그 C#에서는 다소 복잡해 보인다.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

// For Custom System Menu
// using System;
// using System.Windows.Forms;
// using System.Runtime.InteropServices;

namespace MyFormApp
{
    public partial class frmMain : Form
    {
#region Win32 API Stuff
        // Define the Win32 API methods we are going to use
        [DllImport("user32.dll")]
        private static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);

        [DllImport("user32.dll")]
        private static extern bool InsertMenu(IntPtr hMenu, Int32 wPosition, 
            Int32 wFlags, Int32 wIDNewItem, string lpNewItem);

        /// Define our Constants we will use
        public const Int32 WM_SYSCOMMAND    = 0x112;
        public const Int32 MF_SEPARATOR     = 0x800;
        public const Int32 MF_BYPOSITION    = 0x400;
        public const Int32 MF_STRING        = 0x000;
#endregion

        // The constants we'll use to identify our custom system menu items
        public const Int32 _SettingsSysMenuID   = 1000;
        public const Int32 _AboutSysMenuID      = 1001;

        public frmMain()
        {
            InitializeComponent();
        }

        private void frmMain_Load(object sender, EventArgs e)
        {
            /// Get the Handle for the Forms System Menu
            IntPtr systemMenuHandle = GetSystemMenu(this.Handle, false);

            /// Create our new System Menu items just before the Close menu item
            // Add a menu seperator
            InsertMenu(systemMenuHandle, 5, MF_BYPOSITION | MF_SEPARATOR, 
                0, string.Empty);
            // Add Settings Menu
            InsertMenu(systemMenuHandle, 6, MF_BYPOSITION, 
                _SettingsSysMenuID, "Settings...");
            // Add About Menu
            InsertMenu(systemMenuHandle, 7, MF_BYPOSITION, 
                _AboutSysMenuID, "About...");
        }

        protected override void WndProc(ref Message m)
        {
            // Check if a System Command has been executed
            if (m.Msg == WM_SYSCOMMAND)
            {
                /// Execute the appropriate code for 
                /// the System Menu item that was clicked
                switch (m.WParam.ToInt32())
                {
                    case _SettingsSysMenuID:
                        MessageBox.Show("\"Settings\" was clicked");
                        break;
                    case _AboutSysMenuID:
                        MessageBox.Show("\"About\" was clicked");
                        break;
                }
            }

            base.WndProc(ref m);
        }
    }
}

실행 결과 화면

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Original Post : http://neodreamer-dev.tistory.com/587