Link.cs

/******
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This program is distributed in the hope that it will be useful,
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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******/

// =====================================================================
//
// ShellLink - Using WSH to program shell links
//
// by Jim Hollenhorst, jwtk@ultrapico.com
// Copyright Ultrapico, April 2003
// http://www.ultrapico.com
//
// =====================================================================
using System;
using System.Windows.Forms;
using System.IO;
using IWshRuntimeLibrary;

namespace mhora
{
	/// <summary>
	/// Summary description for Link.
	/// </summary>
	public class Link
	{
		/// <summary>
		/// Check to see if a shortcut exists in a given directory with a specified file name
		/// </summary>
		/// <param name="DirectoryPath">The directory in which to look</param>
		/// <param name="FullPathName">The name of the shortcut (without the .lnk extension) or the full path to a file of the same name</param>
		/// <returns>Returns true if the link exists</returns>
		public static bool Exists(string DirectoryPath, string LinkPathName)
		{
			// Get some file and directory information
			DirectoryInfo SpecialDir=new DirectoryInfo(DirectoryPath);
			// First get the filename for the original file and create a new file
			// name for a link in the Startup directory
			//
			FileInfo originalfile = new FileInfo(LinkPathName);
			string NewFileName = SpecialDir.FullName+"\\"+originalfile.Name+".lnk";
			FileInfo linkfile = new FileInfo(NewFileName);
			return linkfile.Exists;
		}
		
		//Check to see if a shell link exists to the given path in the specified special folder
		// return true if it exists
		public static bool Exists(Environment.SpecialFolder folder, string LinkPathName)
		{
			return Link.Exists(Environment.GetFolderPath(folder), LinkPathName);
		}
		
		/// <summary>
		/// Update the specified folder by creating or deleting a Shell Link if necessary
		/// </summary>
		/// <param name="folder">A SpecialFolder in which the link will reside</param>
		/// <param name="TargetPathName">The path name of the target file for the link</param>
		/// <param name="LinkPathName">The file name for the link itself or, if a path name the directory information will be ignored.</param>
		/// <param name="Create">If true, create the link, otherwise delete it</param>
		public static void Update(Environment.SpecialFolder folder, string TargetPathName, string LinkPathName, bool install)
		{
			// Get some file and directory information
			Link.Update(Environment.GetFolderPath(folder), TargetPathName, LinkPathName, install);
		}
			
		// boolean variable "install" determines whether the link should be there or not.
		// Update the folder by creating or deleting the link as required.
		
		/// <summary>
		/// Update the specified folder by creating or deleting a Shell Link if necessary
		/// </summary>
		/// <param name="DirectoryPath">The full path of the directory in which the link will reside</param>
		/// <param name="TargetPathName">The path name of the target file for the link</param>
		/// <param name="LinkPathName">The file name for the link itself or, if a path name the directory information will be ignored.</param>
		/// <param name="Create">If true, create the link, otherwise delete it</param>
		public static void Update(string DirectoryPath, string TargetPathName, string LinkPathName, bool Create)
		{
			// Get some file and directory information
			DirectoryInfo SpecialDir=new DirectoryInfo(DirectoryPath);
			// First get the filename for the original file and create a new file
			// name for a link in the Startup directory
			//
			FileInfo OriginalFile = new FileInfo(LinkPathName);
			string NewFileName = SpecialDir.FullName+"\\"+OriginalFile.Name+".lnk";
			FileInfo LinkFile = new FileInfo(NewFileName);

			if(Create) // If the link doesn't exist, create it
			{
				if(LinkFile.Exists)return; // We're all done if it already exists
				//Place a shortcut to the file in the special folder 
				try 
				{ 
					// Create a shortcut in the special folder for the file
					// Making use of the Windows Scripting Host
					WshShell shell = new WshShell();
					IWshShortcut link = (IWshShortcut)shell.CreateShortcut(LinkFile.FullName);
					link.TargetPath=TargetPathName;
					link.Save();
				}
				catch 
				{
					MessageBox.Show("Unable to create link in special directory: "+NewFileName,
						"Shell Link Error",MessageBoxButtons.OK,MessageBoxIcon.Error);
				}
			}
			else // otherwise delete it from the startup directory
			{
				if(!LinkFile.Exists)return; // It doesn't exist so we are done!
				try
				{
					LinkFile.Delete();
				}
				catch
				{
					MessageBox.Show("Error deleting link in special directory: "+NewFileName,
						"Shell Link Error",MessageBoxButtons.OK,MessageBoxIcon.Error);
				}
			}
		}

	}
}