/// <summary>
/// Gets an icon from a file path using windows shell
/// </summary>
/// <param name="filePath">The file path.</param>
/// <returns>ImageSource for the icon for the icon at filePath</returns>
public static ImageSource IconFromFilePath(string filePath, IconSize size, bool shouldFallBack = true)
{
MemoryCache memoryCache;
switch (size)
{
case IconSize.Large:
memoryCache = LargeIconCache;
break;
case IconSize.Small:
memoryCache = SmallIconCache;
break;
default:
throw new ArgumentOutOfRangeException($"{nameof(size)} is not a valid icon size");
}
try
{
// todo: IconCache.CacheMemoryLimit; setting
var cacheItem = memoryCache.GetCacheItem(filePath);
if (cacheItem != null)
{
return(cacheItem.Value as ImageSource);
}
var shinfo = new NativeMethods.ShFileInfo();
var hImgSmall = NativeMethods.SHGetFileInfo(filePath, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo),
NativeMethods.SHGFI_ICON | size.ToIconFlag());
var icon = Icon.FromHandle(shinfo.hIcon);
var bmp = icon.ToBitmap();
var img = Imaging.CreateBitmapSourceFromHBitmap(bmp.GetHbitmap(), IntPtr.Zero, Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());
img.Freeze();
var newItem = new CacheItem(filePath, img);
var policy = new CacheItemPolicy
{
SlidingExpiration = TimeSpan.FromMinutes(10)
};
memoryCache.Add(newItem, policy);
return(img);
}
catch (Exception)
{
if (!shouldFallBack)
{
return(null);
}
switch (size)
{
case IconSize.Large:
return(UnknownFileLarge);
case IconSize.Small:
return(UnknownFileSmall);
default:
throw new ArgumentOutOfRangeException($"{nameof(size)} is not a valid IconSize");
}
}
}
public static ShellFileInfo GetShellFileInfo(string filePath)
{
var shinfo = new NativeMethods.ShFileInfo();
var hImgSmall = NativeMethods.SHGetFileInfo(filePath, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo),
NativeMethods.SHGFI_ICON | IconSize.Small.ToIconFlag());
var icon = Icon.FromHandle(shinfo.hIcon);
var bmp = icon.ToBitmap();
var img = Imaging.CreateBitmapSourceFromHBitmap(bmp.GetHbitmap(), IntPtr.Zero, Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());
img.Freeze();
var fvi = FileVersionInfo.GetVersionInfo(filePath);
string displayName = Path.GetFileName(filePath);
if (!string.IsNullOrWhiteSpace(fvi.ProductName))
{
displayName = fvi.ProductName;
}
return(new ShellFileInfo
{
Icon = img,
DisplayName = displayName,
Description = fvi.FileDescription,
FilePath = filePath
});
}
/// <summary>
/// Initializes the <see cref="ShellHelper" /> class.
/// </summary>
static ShellHelper()
{
var shinfo = new NativeMethods.ShFileInfo();
var hImgSmall = NativeMethods.SHGetFileInfo("unknownfile32x32.ico", 0, ref shinfo, (uint)Marshal.SizeOf(shinfo),
NativeMethods.SHGFI_ICON | IconSize.Large.ToIconFlag());
var icon = Icon.FromHandle(shinfo.hIcon);
var bmp = icon.ToBitmap();
var img = Imaging.CreateBitmapSourceFromHBitmap(bmp.GetHbitmap(), IntPtr.Zero, Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());
img.Freeze();
UnknownFileLarge = img;
hImgSmall = NativeMethods.SHGetFileInfo("unknownfile16x16.ico", 0, ref shinfo, (uint)Marshal.SizeOf(shinfo),
NativeMethods.SHGFI_ICON | IconSize.Small.ToIconFlag());
icon = Icon.FromHandle(shinfo.hIcon);
bmp = icon.ToBitmap();
img = Imaging.CreateBitmapSourceFromHBitmap(bmp.GetHbitmap(), IntPtr.Zero, Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());
img.Freeze();
UnknownFileSmall = img;
}
