Symbol aus dll laden in Form von z.B. "C:\Windows\System32\shell32.dll,-123"



  • Hallo,

    ich schreibe gerade an einen dateiexplorer und bin auf ein problem gestoßen:
    wenn ich nun die dateien aus den verzeichnissen auslese und die symboldatei (für die ansicht der dateien in dem listview steuerelement) aus der registry hole, erhalte ich zumeist die form von z.b.: "C:\Windows\System32\shell32.dll, -123", also eine Ressourcenbibliothek in der das symbol vorhanden ist. nun zu meiner frage, wie kann ich das symbol auslesen??
    Ich habs versucht mit:

    new Icon("C:\Windows\System32\shell32.dll, -123");
    

    Doch ich erhalte die exception, das die datei nicht vorhanden ist, weil er den gesamten pfad als dateinamen "versteht". kann man diese ressourcen auch anders laden, z.b. durch shell extensions oder bietet das framework passende funktionen dafür?

    ich danke schon mal für tipps.

    PS: ich benutze VS 8





  • Aber das hier scheint genau das zu sein was Du brauchst

    http://www.codeproject.com/csharp/iconhandler.asp

    Eine Klasse IconHandler



  • Danke für die schnelle Antwort, ich werde es morgen gleich mal ausprobieren.



  • hier der Code mit der einen Methode von mir:

    using System;
    using System.Drawing;
    using System.Runtime.InteropServices;
    using Microsoft.Win32;
    using System.Reflection;
    using System.IO;
    using System.Windows.Forms;
    
    namespace ExternIconResources
    {
    	struct SHFILEINFO 
    	{
    		public IntPtr hIcon;        
    		public IntPtr iIcon;        
    		public uint dwAttributes;    
    		[MarshalAs( UnmanagedType.ByValTStr, SizeConst = 260 )]
    		public string szDisplayName;
    		[MarshalAs( UnmanagedType.ByValTStr, SizeConst = 80 )]
    		public string szTypeName;
    	};
    
    	public enum IconSize : uint
    	{
    		Large = 0x0,  //32x32
    		Small = 0x1 //16x16        
    	}
    
    	//the function that will extract the icons from a file
    	public class IconHandler
    	{
    		const uint SHGFI_ICON = 0x100;
    		const uint SHGFI_USEFILEATTRIBUTES    = 0x10;
    
    		[DllImport("Shell32", CharSet=CharSet.Auto)]
    		internal extern static int ExtractIconEx (
    			[MarshalAs(UnmanagedType.LPTStr)] 
    			string lpszFile,       //size of the icon
    			int nIconIndex,        //index of the icon 
    			//(in case we have more 
    			//then 1 icon in the file
    			IntPtr[] phIconLarge,  //32x32 icon
    			IntPtr[] phIconSmall,  //16x16 icon
    			int nIcons);           //how many to get
    
    		[DllImport("shell32.dll")]
    		static extern IntPtr SHGetFileInfo(
    			string pszPath,                //path
    			uint dwFileAttributes,        //attributes
    			ref SHFILEINFO psfi,        //struct pointer
    			uint cbSizeFileInfo,        //size
    			uint uFlags);    //flags
    
    		//we need this function to release the unmanaged resource,
    		//the unmanaged resource will be 
    		//copies to a managed one and it will be returned.
    		[DllImport("user32.dll", CharSet = CharSet.Auto)]
    		extern static bool DestroyIcon(IntPtr handle);
    
    		//will return an array of icons 
    		public static Icon[] IconsFromFile(string Filename,IconSize Size)
    		{
    			int IconCount = ExtractIconEx(Filename,-1, 
    				null,null,0); //checks how many icons.
    			IntPtr[] IconPtr = new IntPtr[IconCount];
    			Icon TempIcon;
    
    			//extracts the icons by the size that was selected.
    			if (Size == IconSize.Small)
    				ExtractIconEx(Filename,0,null,IconPtr,IconCount);
    			else
    				ExtractIconEx(Filename,0,IconPtr,null,IconCount);
    
    			Icon[] IconList = new Icon[IconCount];
    
    			//gets the icons in a list.
    			for (int i = 0; i < IconCount; i++)
    			{
    				TempIcon = (Icon) Icon.FromHandle(IconPtr[i]);
    				IconList[i] = GetManagedIcon(ref TempIcon);
    			}
    
    			return IconList;
    		}
    
    		//extract one selected by index icon from a file.
    		public static Icon IconFromFile(string Filename, 
    			IconSize Size,int Index)
    		{
    			int IconCount = ExtractIconEx(Filename,
    				-1,null,null,0); //checks how many icons.
    			if (IconCount <= 0 || Index >= IconCount)
    				return null; // no icons were found.
    
    			Icon TempIcon;
    			IntPtr[] IconPtr = new IntPtr[1];
    
    			//extracts the icon that we want in the selected size.
    			if (Size == IconSize.Small)
    				ExtractIconEx(Filename,Index,null,IconPtr,1);
    			else
    				ExtractIconEx(Filename,Index,IconPtr,null,1);
    
    			TempIcon = Icon.FromHandle(IconPtr[0]);
    
    			return GetManagedIcon(ref TempIcon);
    		}
    		public static Icon IconFromExtension(string Extension, 
    			IconSize Size)
    		{
    			try
    			{
    				Icon TempIcon;
    
    				//add '.' if nessesry
    				if (Extension[0] != '.')
    					Extension = '.' + Extension;
    
    				//temp struct for getting file shell info
    				SHFILEINFO TempFileInfo = new SHFILEINFO();
    
    				SHGetFileInfo(
    					Extension,
    					0, 
    					ref TempFileInfo,
    					(uint)Marshal.SizeOf(TempFileInfo),
    					SHGFI_ICON | SHGFI_USEFILEATTRIBUTES | (uint) Size);
    
    				TempIcon = (Icon) Icon.FromHandle(TempFileInfo.hIcon);
    				return GetManagedIcon(ref TempIcon);
    			}
    			catch (Exception e)
    			{
    				System.Diagnostics.Debug.WriteLine("error" + 
    					" while trying to get icon for " + 
    					Extension + " :" + e.Message);
    				return null;
    			}
    		}
    		public static Icon IconFromResource(string ResourceName)
    		{
    			Assembly TempAssembly = Assembly.GetCallingAssembly();
    
    			return new Icon(
    				TempAssembly.GetManifestResourceStream(ResourceName));
    		}
    
    		public static void SaveIconFromImage(Image SourceImage, 
    			string IconFilename,IconSize DestenationIconSize)
    		{
    			Size NewIconSize = DestenationIconSize == 
    				IconSize.Large ? new Size(32,32) : new Size(16,16);
    
    			Bitmap RawImage = new Bitmap(SourceImage,NewIconSize);
    			Icon TempIcon = Icon.FromHandle(RawImage.GetHicon());
    			FileStream NewIconStream = 
    				new FileStream(IconFilename,FileMode.Create);
    
    			TempIcon.Save(NewIconStream);
    
    			NewIconStream.Close();
    		}
    
    		public static void SaveIcon(Icon SourceIcon, 
    			string IconFilename)
    		{
    			FileStream NewIconStream = new 
    				FileStream(IconFilename,FileMode.Create);
    
    			SourceIcon.Save(NewIconStream);
    
    			NewIconStream.Close();
    		}
    
    		public static Icon GetManagedIcon(ref Icon UnmanagedIcon)
    		{
    			Icon ManagedIcon = (Icon) UnmanagedIcon.Clone();
    
    			DestroyIcon(UnmanagedIcon.Handle);
    
    			return ManagedIcon;
    		}
    
                // das Ding habe ich noch eingepflanzt
    		public static void GetIconsInListViewFromFile(ListView listView, string Filename, IconSize Size)
    		{
    					Icon [] icons = IconHandler.IconsFromFile(Filename, Size);
    					if(icons.Length == 0) return;
    
    					ImageList imageList = new ImageList();
    					if(Size == IconSize.Large)
    						imageList.ImageSize = new Size(32,32);
    					else
    						imageList.ImageSize = new Size(16,16);
    
    					listView.Items.Clear();
    
    					for(int idx = 0;idx <icons.Length;idx++)
    					{
    						imageList.Images.Add(icons[idx]);
    						listView.Items.Add("",idx);
    					}
    
    					if(Size == IconSize.Large)
    						listView.LargeImageList = imageList;
    					else
    						listView.SmallImageList = imageList;
    
    		}
    	}
    }
    

    um diese Methode habe ichs erweitert:

    public static void GetIconsInListViewFromFile(ListView listView, string Filename, IconSize Size)

    Diese Klasse brauchst Du nicht instanzieren würde nix bringen
    weil alles nur statisch!

    Immer aufrufen über

    IconHandler. .... (...);
    


  • ja und nutzen kannst Du es dann so

    private void button1_Click(object sender, System.EventArgs e)
    		{
    
    			IconHandler.GetIconsInListViewFromFile(listView1,textBox1.Text,IconSize.Large);
    		}
    


  • vielen dank, das war genau das, wo nach ich gesucht habe.


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