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SEBWIN-523: Fixed issue with extraction of file icons for network file paths.

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This commit is contained in:
Damian Büchel 2022-01-18 22:29:01 +01:00
parent 4444187cdd
commit e8df5ad6a9
1 changed files with 26 additions and 2 deletions
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28
SafeExamBrowser.UserInterface.Shared/Utilities/IconLoader.cs
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@ -7,8 +7,10 @@
*/
using System;
using System.Drawing;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows;
using System.Windows.Interop;
using System.Windows.Media;
@ -18,6 +20,7 @@ namespace SafeExamBrowser.UserInterface.Shared.Utilities
{
public static class IconLoader
{
private const int MAX_PATH_CHARS = 260;
private const uint SHGFI_ICON = 0x100;
private const uint SHGFI_LARGEICON = 0x0;
private const uint SHGFI_SMALLICON = 0x1;
@ -35,15 +38,36 @@ namespace SafeExamBrowser.UserInterface.Shared.Utilities
public static ImageSource LoadIconFor(FileInfo file)
{
using (var icon = System.Drawing.Icon.ExtractAssociatedIcon(file.FullName))
try
{
return Imaging.CreateBitmapSourceFromHIcon(icon.Handle, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
using (var icon = Icon.ExtractAssociatedIcon(file.FullName))
{
return Imaging.CreateBitmapSourceFromHIcon(icon.Handle, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
}
}
catch
{
// Icon.ExtractAssociatedIcon(...) has proven to be error-prone, especially for network paths. Thus we try to use the native API
// in those cases, see also https://stackoverflow.com/questions/1842226/how-to-get-the-associated-icon-from-a-network-share-file.
var builder = new StringBuilder(MAX_PATH_CHARS);
builder.Append(file.FullName);
var handle = ExtractAssociatedIcon(IntPtr.Zero, builder, out _);
using (var icon = Icon.FromHandle(handle))
{
return Imaging.CreateBitmapSourceFromHIcon(icon.Handle, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
}
}
}
[DllImport("user32.dll")]
private static extern int DestroyIcon(IntPtr hIcon);
[DllImport("shell32.dll", CharSet = CharSet.Unicode)]
static extern IntPtr ExtractAssociatedIcon(IntPtr hInst, StringBuilder lpIconPath, out ushort lpiIcon);
[DllImport("shell32.dll", CharSet = CharSet.Unicode)]
private static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags);