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Enumerate and Host Control Panel Applets using C#.

, 15 Feb 2004
Demonstrates how to enumerate and host Windows Control Panel Applets using C# and unmanaged C++.
appletviewer_demo.zip
appletviewer_src.zip
AppletEngine
AppletEngine.csproj.user
bin
Debug
AppletEngine.dll
obj
Debug
temp
TempPE
AppletProxy
Debug
Exports.def
AppletViewer
App.ico
AppletViewer.csproj.user
bin
Debug
AppletEngine.dll
AppletProxy.dll
Release
AppletEngine.dll
AppletProxy.dll
AppletViewer.exe
obj
Debug
temp
TempPE
Release
temp
TempPE
using System;
using System.IO;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using AppletEngine;

namespace AppletEngine
{
	/// <summary>
	/// Summary description for AppletViewerWindow.
	/// </summary>
	public class AppletViewerWindow : System.Windows.Forms.Form
	{
		private AppletEngine _appletEngine;
		private ArrayList _appletLibraries;
		private System.Windows.Forms.ColumnHeader columnHeader1;
		private System.Windows.Forms.ColumnHeader columnHeader2;
		private System.Windows.Forms.ListView listView;
		private System.Windows.Forms.ImageList smallImageList;
		private System.Windows.Forms.ImageList largeImageList;
		private System.Windows.Forms.MainMenu mainMenu1;
		private System.Windows.Forms.MenuItem menuItemView;
		private System.ComponentModel.IContainer components;

		public AppletViewerWindow()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();
			
			this.Closed += new EventHandler(AppletViewerWindow_Closed);

			this.LoadViewMenuItems();
			this.CheckMenuItemAccordingToView(this.listView.View);
			this.LoadApplets();						
			this.DisplayApplets();			
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			this.listView = new System.Windows.Forms.ListView();
			this.columnHeader1 = new System.Windows.Forms.ColumnHeader();
			this.columnHeader2 = new System.Windows.Forms.ColumnHeader();
			this.largeImageList = new System.Windows.Forms.ImageList(this.components);
			this.smallImageList = new System.Windows.Forms.ImageList(this.components);
			this.mainMenu1 = new System.Windows.Forms.MainMenu();
			this.menuItemView = new System.Windows.Forms.MenuItem();
			this.SuspendLayout();
			// 
			// listView
			// 
			this.listView.BackColor = System.Drawing.Color.SteelBlue;
			this.listView.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
																					   this.columnHeader1,
																					   this.columnHeader2});
			this.listView.Dock = System.Windows.Forms.DockStyle.Fill;
			this.listView.ForeColor = System.Drawing.Color.White;
			this.listView.FullRowSelect = true;
			this.listView.LargeImageList = this.largeImageList;
			this.listView.Location = new System.Drawing.Point(0, 0);
			this.listView.Name = "listView";
			this.listView.Size = new System.Drawing.Size(592, 366);
			this.listView.SmallImageList = this.smallImageList;
			this.listView.Sorting = System.Windows.Forms.SortOrder.Ascending;
			this.listView.TabIndex = 0;
			this.listView.DoubleClick += new System.EventHandler(this.listView1_DoubleClick);
			this.listView.SelectedIndexChanged += new System.EventHandler(this.listView1_SelectedIndexChanged);
			// 
			// columnHeader1
			// 
			this.columnHeader1.Text = "Name";
			this.columnHeader1.Width = 100;
			// 
			// columnHeader2
			// 
			this.columnHeader2.Text = "Description";
			this.columnHeader2.Width = 403;
			// 
			// largeImageList
			// 
			this.largeImageList.ColorDepth = System.Windows.Forms.ColorDepth.Depth32Bit;
			this.largeImageList.ImageSize = new System.Drawing.Size(32, 32);
			this.largeImageList.TransparentColor = System.Drawing.Color.Magenta;
			// 
			// smallImageList
			// 
			this.smallImageList.ColorDepth = System.Windows.Forms.ColorDepth.Depth32Bit;
			this.smallImageList.ImageSize = new System.Drawing.Size(16, 16);
			this.smallImageList.TransparentColor = System.Drawing.Color.Magenta;
			// 
			// mainMenu1
			// 
			this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					  this.menuItemView});
			// 
			// menuItemView
			// 
			this.menuItemView.Index = 0;
			this.menuItemView.Text = "View";
			// 
			// AppletViewerWindow
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(592, 366);
			this.Controls.Add(this.listView);
			this.Menu = this.mainMenu1;
			this.Name = "AppletViewerWindow";
			this.Text = "Available Control Panel Applets";
			this.ResumeLayout(false);

		}
		#endregion

		private void DisplayApplets()
		{
			foreach(AppletLibrary appletLibrary in _appletLibraries)
			{
				foreach(Applet applet in appletLibrary.Applets)
				{
					ListViewItem item = new ListViewItem();
					item.Text = applet.Name;
					item.SubItems.Add(applet.Description);
					item.Tag = applet;					
					
					item.ImageIndex = this.smallImageList.Images.Count;

					if (applet.SmallImage != null)
					{						
						this.smallImageList.Images.Add(applet.SmallImage);
					}

					if (applet.LargeImage != null)
					{
						this.largeImageList.Images.Add(applet.LargeImage);
					}

					this.listView.Items.Add(item);
				}
			}
		}

		private void AppletViewerWindow_Closed(object sender, EventArgs e)
		{
			foreach(AppletLibrary appletLibrary in _appletLibraries)
				appletLibrary.Dispose();
		}

		private void listView1_SelectedIndexChanged(object sender, System.EventArgs e)
		{
		
		}

		private void listView1_DoubleClick(object sender, System.EventArgs e)
		{
			try
			{
				ListViewItem item = this.listView.SelectedItems[0];
				if (item != null)
				{
					Applet applet = item.Tag as Applet;
					applet.Open();
				}
			}
			catch(System.Exception systemException)
			{
				System.Diagnostics.Trace.WriteLine(systemException);
			}
		}

		private void LoadApplets()
		{
			_appletEngine = new AppletEngine();
			FileInfo[] libraries = _appletEngine.FindAppletLibraries(System.Environment.SystemDirectory);
			_appletLibraries = _appletEngine.CreateApplets(libraries, this.Handle);
		}

		private void LoadViewMenuItems()
		{
			Array views = Enum.GetValues(typeof(System.Windows.Forms.View));
			foreach(System.Windows.Forms.View view in views)
			{
				MenuItem mi = new MenuItem(view.ToString(), new EventHandler(this.OnMenuItemClicked));
				mi.RadioCheck = true;
				this.menuItemView.MenuItems.Add(mi);			
			}
		}

		private void CheckMenuItemAccordingToView(View view)
		{
			foreach(MenuItem mi in this.menuItemView.MenuItems)
				if (mi.Text == view.ToString())
					mi.Checked = true;
				else
					mi.Checked = false;
		}

		private void OnMenuItemClicked(object sender, System.EventArgs e)
		{
			MenuItem mi = sender as MenuItem;
			if (mi != null)
			{
				Array views = Enum.GetValues(typeof(System.Windows.Forms.View));
				foreach(System.Windows.Forms.View view in views)
				{
					if (view.ToString() == mi.Text)
					{
						this.listView.View = view;
						this.CheckMenuItemAccordingToView(view);
					}
				}
			}		
						
		}


	}
}

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About the Author

Mark Belles
Software Developer (Senior)
United States United States
Senior Application Developer specializing in Windows desktop and network development.
 
Professional Experience
- B.S. of Computer Science (Graduated 2001 - PSU)
- Senior Application Developer (8+ yrs)
- Microsoft Certified Professional
 
Primary Interests
- C#, C++, HTML, Javascript
- XML, ASP.NET, Web Services, SOAP, UDDI
- Socket programming and anything network related
- Reflection, Serialization, and Plugin Frameworks
- Owner-drawn controls and GDI+ goodness

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