Refactored PluginUtils to have the GetExePath and GetExeIcon, which was needed for giving the ExternalCommandPlugin an icon.

git-svn-id: http://svn.code.sf.net/p/greenshot/code/trunk@2057 7dccd23d-a4a3-4e1f-8c07-b4c1b4018ab4

GreenshotPlugin/Core/PluginUtils.cs

@@ -23,13 +23,60 @@ using System.Drawing;
 using System.Windows.Forms;
 
 using Greenshot.Plugin;
+using Microsoft.Win32;
+using System.IO;
 
 namespace GreenshotPlugin.Core {
 	/// <summary>
 	/// Description of PluginUtils.
 	/// </summary>
 	public static class PluginUtils {
-		
+		private static readonly log4net.ILog LOG = log4net.LogManager.GetLogger(typeof(PluginUtils));
+		private const string PATH_KEY = @"SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\";
+
+		/// <summary>
+		/// Get the path of an executable
+		/// </summary>
+		/// <param name="exeName">e.g. cmd.exe</param>
+		/// <returns>Path to file</returns>
+		public static string GetExePath(string exeName) {
+			using (RegistryKey key = Registry.LocalMachine.OpenSubKey(PATH_KEY + exeName, false)) {
+				if (key != null) {
+					// "" is the default key, which should point to the requested location
+					return (string)key.GetValue("");
+				}
+			}
+			foreach (string test in (Environment.GetEnvironmentVariable("PATH") ?? "").Split(';')) {
+				string path = test.Trim();
+				if (!String.IsNullOrEmpty(path) && File.Exists(path = Path.Combine(path, exeName))) {
+					return Path.GetFullPath(path);
+				}
+			}
+			return null;
+		}
+
+		/// <summary>
+		/// Get icon for executable
+		/// </summary>
+		/// <param name="path">path to the exe or dll</param>
+		/// <param name="index">index of the icon</param>
+		/// <returns>Bitmap with the icon or null if something happended</returns>
+		public static Bitmap GetExeIcon(string path, int index) {
+			if (!File.Exists(path)) {
+				return null;
+			}
+			try {
+				using (Icon appIcon = ImageHelper.ExtractAssociatedIcon(path, index, false)) {
+					if (appIcon != null) {
+						return appIcon.ToBitmap();
+					}
+				}
+			} catch (Exception exIcon) {
+				LOG.Error("error retrieving icon: ", exIcon);
+			}
+			return null;
+		}
+
 		/// <summary>
 		/// Helper method to add a MenuItem to the File MenuItem of an ImageEditor
 		/// </summary>