[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); } } }

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