/// <summary>Gets the Shell icon for the given file name or extension.</summary>
/// <param name="fileNameOrExtension">The file name or extension .</param>
/// <param name="iconType">Flags to specify the type of the icon to retrieve. This uses the <see cref="SHGetFileInfo(string, System.IO.FileAttributes, ref SHFILEINFO, int, SHGFI)"/> method and can only retrieve small or large icons.</param>
/// <returns>An <see cref="Icon"/> instance if found; otherwise <see langword="null"/>.</returns>
public static Icon GetFileIcon(string fileNameOrExtension, ShellIconType iconType = ShellIconType.Large)
{
const SHGFI baseFlags = SHGFI.SHGFI_USEFILEATTRIBUTES | SHGFI.SHGFI_ICON;
var shfi = new SHFILEINFO();
var ret = SHGetFileInfo(fileNameOrExtension, 0, ref shfi, shfiSz, baseFlags | (SHGFI)iconType);
if (ret == IntPtr.Zero)
{
ret = SHGetFileInfo(fileNameOrExtension, 0, ref shfi, shfiSz, SHGFI.SHGFI_ICON | (SHGFI)iconType);
}
return(ret == IntPtr.Zero ? null : IconLocation.GetClonedIcon(shfi.hIcon));
}
/// <summary>Gets the system icon for the given file name or extension.</summary>
/// <param name="fileNameOrExtension">The file name or extension.</param>
/// <param name="iconSize">Size of the icon.</param>
/// <returns>An <see cref="Icon"/> instance if found; otherwise <see langword="null"/>.</returns>
public static Icon GetSystemIcon(string fileNameOrExtension, ShellImageSize iconSize = ShellImageSize.Large)
{
var shfi = new SHFILEINFO();
var hImageList = SHGetFileInfo(fileNameOrExtension, 0, ref shfi, shfiSz, SHGFI.SHGFI_SYSICONINDEX | (iconSize == ShellImageSize.Small ? SHGFI.SHGFI_SMALLICON : 0));
if (hImageList == IntPtr.Zero)
{
return(null);
}
if (iconSize <= ShellImageSize.Small)
{
return(IconLocation.GetClonedIcon(ImageList_GetIcon(hImageList, shfi.iIcon, IMAGELISTDRAWFLAGS.ILD_TRANSPARENT)));
}
SHGetImageList((SHIL)iconSize, typeof(IImageList).GUID, out var il).ThrowIfFailed();
return(IconLocation.GetClonedIcon(il.GetIcon(shfi.iIcon, IMAGELISTDRAWFLAGS.ILD_TRANSPARENT)));
}
