Projektdateien hinzufügen.
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Kevin Krüger
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namespace VideoBrowser.Controls.CefSharpBrowser.Helpers
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{
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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.IO;
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using System.Runtime.InteropServices;
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using System.Windows;
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using System.Windows.Interop;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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/// <summary>
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/// Internals are mostly from here: http://www.codeproject.com/Articles/2532/Obtaining-and-managing-file-and-folder-icons-using
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/// Caches all results.
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/// </summary>
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public static class ApplicationIconHelper
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{
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#region Fields
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private static readonly Dictionary<string, ImageSource> _largeIconCache = new Dictionary<string, ImageSource>();
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private static readonly Dictionary<string, ImageSource> _smallIconCache = new Dictionary<string, ImageSource>();
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#endregion Fields
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#region Methods
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/// <summary>
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/// Get an icon for a given filename.
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/// </summary>
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/// <param name="fileName">any filename.</param>
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/// <param name="large">16x16 or 32x32 icon.</param>
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/// <returns>null if path is null, otherwise - an icon.</returns>
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public static ImageSource FindIconForFilename(this string fileName, bool large)
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{
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var extension = Path.GetExtension(fileName);
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if (extension == null)
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{
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return null;
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}
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var cache = large ? _largeIconCache : _smallIconCache;
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ImageSource icon;
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if (cache.TryGetValue(extension, out icon))
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{
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return icon;
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}
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icon = IconReader.GetFileIcon(fileName, large ? IconReader.IconSize.Large : IconReader.IconSize.Small, false).ToImageSource();
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cache.Add(extension, icon);
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return icon;
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}
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/// <summary>
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/// http://stackoverflow.com/a/6580799/1943849.
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/// </summary>
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/// <param name="icon">The icon<see cref="Icon"/>.</param>
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/// <returns>The <see cref="ImageSource"/>.</returns>
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private static ImageSource ToImageSource(this Icon icon)
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{
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var imageSource = Imaging.CreateBitmapSourceFromHIcon(
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icon.Handle,
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Int32Rect.Empty,
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BitmapSizeOptions.FromEmptyOptions());
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return imageSource;
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}
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#endregion Methods
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/// <summary>
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/// Provides static methods to read system icons for both folders and files.
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/// </summary>
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private static class IconReader
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{
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#region Enums
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/// <summary>
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/// Options to specify the size of icons to return.
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/// </summary>
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public enum IconSize
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{
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/// <summary>
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/// Specify large icon - 32 pixels by 32 pixels.
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/// </summary>
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Large = 0,
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/// <summary>
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/// Specify small icon - 16 pixels by 16 pixels.
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/// </summary>
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Small = 1
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}
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#endregion Enums
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#region Methods
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/// <summary>
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/// Returns an icon for a given file - indicated by the name parameter.
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/// </summary>
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/// <param name="name">Pathname for file.</param>
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/// <param name="size">Large or small.</param>
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/// <param name="linkOverlay">Whether to include the link icon.</param>
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/// <returns>System.Drawing.Icon.</returns>
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public static Icon GetFileIcon(string name, IconSize size, bool linkOverlay)
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{
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var shfi = new Shell32.Shfileinfo();
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var flags = Shell32.ShgfiIcon | Shell32.ShgfiUsefileattributes;
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if (linkOverlay)
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{
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flags += Shell32.ShgfiLinkoverlay;
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}
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/* Check the size specified for return. */
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if (IconSize.Small == size)
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{
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flags += Shell32.ShgfiSmallicon;
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}
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else
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{
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flags += Shell32.ShgfiLargeicon;
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}
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Shell32.SHGetFileInfo(name,
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Shell32.FileAttributeNormal,
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ref shfi,
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(uint)Marshal.SizeOf(shfi),
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flags);
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// Copy (clone) the returned icon to a new object, thus allowing us to clean-up properly
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var icon = (Icon)Icon.FromHandle(shfi.hIcon).Clone();
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User32.DestroyIcon(shfi.hIcon); // Cleanup
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return icon;
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}
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#endregion Methods
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}
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/// <summary>
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/// Wraps necessary Shell32.dll structures and functions required to retrieve Icon Handles using SHGetFileInfo. Code
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/// courtesy of MSDN Cold Rooster Consulting case study.
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/// </summary>
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private static class Shell32
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{
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#region Constants
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public const uint FileAttributeNormal = 0x00000080;
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public const uint ShgfiIcon = 0x000000100;// get icon
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public const uint ShgfiLargeicon = 0x000000000;// get large icon
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public const uint ShgfiLinkoverlay = 0x000008000;// put a link overlay on icon
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public const uint ShgfiSmallicon = 0x000000001;// get small icon
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public const uint ShgfiUsefileattributes = 0x000000010;// use passed dwFileAttribute
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private const int MaxPath = 256;
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#endregion Constants
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#region Methods
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/// <summary>
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/// The SHGetFileInfo.
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/// </summary>
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/// <param name="pszPath">The pszPath<see cref="string"/>.</param>
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/// <param name="dwFileAttributes">The dwFileAttributes<see cref="uint"/>.</param>
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/// <param name="psfi">The psfi<see cref="Shfileinfo"/>.</param>
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/// <param name="cbFileInfo">The cbFileInfo<see cref="uint"/>.</param>
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/// <param name="uFlags">The uFlags<see cref="uint"/>.</param>
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/// <returns>The <see cref="IntPtr"/>.</returns>
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[DllImport("Shell32.dll")]
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public static extern IntPtr SHGetFileInfo(
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string pszPath,
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uint dwFileAttributes,
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ref Shfileinfo psfi,
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uint cbFileInfo,
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uint uFlags
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);
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#endregion Methods
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/// <summary>
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/// Defines the <see cref="Shfileinfo" />.
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/// </summary>
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[StructLayout(LayoutKind.Sequential)]
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public struct Shfileinfo
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{
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#region Constants
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private const int Namesize = 80;
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#endregion Constants
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#region Fields
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public readonly IntPtr hIcon;
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private readonly uint dwAttributes;
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private readonly int iIcon;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = MaxPath)]
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private readonly string szDisplayName;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = Namesize)]
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private readonly string szTypeName;
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#endregion Fields
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}
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;
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}
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/// <summary>
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/// Wraps necessary functions imported from User32.dll. Code courtesy of MSDN Cold Rooster Consulting example.
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/// </summary>
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private static class User32
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{
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#region Methods
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/// <summary>
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/// Provides access to function required to delete handle. This method is used internally
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/// and is not required to be called separately.
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/// </summary>
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/// <param name="hIcon">Pointer to icon handle.</param>
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/// <returns>N/A.</returns>
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[DllImport("User32.dll")]
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public static extern int DestroyIcon(IntPtr hIcon);
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#endregion Methods
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}
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}
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}
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