86 lines
2.8 KiB
C#
86 lines
2.8 KiB
C#
/*
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* Copyright (c) 2023 ETH Zürich, Educational Development and Technology (LET)
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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using System;
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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.Text;
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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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namespace SafeExamBrowser.UserInterface.Shared.Utilities
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{
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public static class IconLoader
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{
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private const int MAX_PATH_CHARS = 260;
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private const uint SHGFI_ICON = 0x100;
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private const uint SHGFI_LARGEICON = 0x0;
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private const uint SHGFI_SMALLICON = 0x1;
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public static ImageSource LoadIconFor(DirectoryInfo directory)
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{
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var fileInfo = new SHFILEINFO();
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var result = SHGetFileInfo(directory.FullName, 0, ref fileInfo, (uint) Marshal.SizeOf(fileInfo), SHGFI_ICON | SHGFI_SMALLICON);
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var imageSource = Imaging.CreateBitmapSourceFromHIcon(fileInfo.hIcon, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
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DestroyIcon(fileInfo.hIcon);
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return imageSource;
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}
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public static ImageSource LoadIconFor(FileInfo file)
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{
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try
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{
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using (var icon = Icon.ExtractAssociatedIcon(file.FullName))
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{
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return Imaging.CreateBitmapSourceFromHIcon(icon.Handle, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
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}
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}
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catch
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{
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// Icon.ExtractAssociatedIcon(...) has proven to be error-prone, especially for network paths. Thus we try to use the native API
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// in those cases, see also https://stackoverflow.com/questions/1842226/how-to-get-the-associated-icon-from-a-network-share-file.
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var builder = new StringBuilder(MAX_PATH_CHARS);
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builder.Append(file.FullName);
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var handle = ExtractAssociatedIcon(IntPtr.Zero, builder, out _);
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using (var icon = Icon.FromHandle(handle))
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{
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return Imaging.CreateBitmapSourceFromHIcon(icon.Handle, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
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}
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}
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}
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[DllImport("user32.dll")]
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private static extern int DestroyIcon(IntPtr hIcon);
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[DllImport("shell32.dll", CharSet = CharSet.Unicode)]
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static extern IntPtr ExtractAssociatedIcon(IntPtr hInst, StringBuilder lpIconPath, out ushort lpiIcon);
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[DllImport("shell32.dll", CharSet = CharSet.Unicode)]
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private static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags);
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[StructLayout(LayoutKind.Sequential)]
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private struct SHFILEINFO
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{
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public IntPtr hIcon;
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public IntPtr iIcon;
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public uint dwAttributes;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
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public string szDisplayName;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
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public string szTypeName;
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};
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}
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}
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