public void Dispose()
{
try
{
if (shellDispatch != null)
Marshal.ReleaseComObject(shellDispatch);
if (shell != null)
Marshal.ReleaseComObject(shell);
}
finally
{
shell = null;
shellDispatch = null;
GC.SuppressFinalize(this);
}
}
public Shell()
{
shell = new Shell32();
shellDispatch = (IShellDispatch)shell;
}
/// <summary>
/// Returns an icon for a given file - indicated by the name parameter.
/// </summary>
/// <param name="name">Extension or pathname for file.</param>
/// <param name="size">Large or small</param>
/// <param name="linkOverlay">Whether to include the link icon</param>
/// <param name="shfi">Return File Information</param>
/// <returns>System.Drawing.Icon</returns>
public static Icon GetFileIcon(string name, IconSize size, bool linkOverlay, ref Shell32.SHFILEINFO shfi)
{
name = Environment.ExpandEnvironmentVariables(name);
shfi = new Shell32.SHFILEINFO();
Shell32.SHGetFileInfoConstants flags = Shell32.SHGetFileInfoConstants.SHGFI_TYPENAME | Shell32.SHGetFileInfoConstants.SHGFI_DISPLAYNAME | Shell32.SHGetFileInfoConstants.SHGFI_ICON | Shell32.SHGetFileInfoConstants.SHGFI_SHELLICONSIZE | Shell32.SHGetFileInfoConstants.SHGFI_SYSICONINDEX | Shell32.SHGetFileInfoConstants.SHGFI_USEFILEATTRIBUTES;
if (linkOverlay) flags |= Shell32.SHGetFileInfoConstants.SHGFI_LINKOVERLAY;
/* Check the size specified for return. */
if (IconSize.Small == size)
flags |= Shell32.SHGetFileInfoConstants.SHGFI_SMALLICON;
else
flags |= Shell32.SHGetFileInfoConstants.SHGFI_LARGEICON;
IntPtr hIml = Shell32.SHGetFileInfo(name,
Shell32.FILE_ATTRIBUTE.NORMAL,
ref shfi,
(uint)Marshal.SizeOf(shfi),
flags);
if (shfi.hIcon == IntPtr.Zero) return null;
if (!Utils.IsXpOrAbove()) return GetManagedIcon(shfi.hIcon);
// Get the System IImageList object from the Shell:
Guid iidImageList = new Guid("46EB5926-582E-4017-9FDF-E8998DAA0950");
Shell32.IImageList iImageList = null;
int ret = Shell32.SHGetImageList(
(int)size,
ref iidImageList,
ref iImageList
);
// the image list handle is the IUnknown pointer, but
// using Marshal.GetIUnknownForObject doesn't return
// the right value. It really doesn't hurt to make
// a second call to get the handle:
Shell32.SHGetImageListHandle((int)size, ref iidImageList, ref hIml);
IntPtr hIcon = IntPtr.Zero;
if (iImageList == null)
{
hIcon = Comctl32.ImageList_GetIcon(
hIml,
shfi.iIcon,
(int)Comctl32.ImageListDrawItemConstants.ILD_TRANSPARENT);
}
else
{
iImageList.GetIcon(
shfi.iIcon,
(int)Comctl32.ImageListDrawItemConstants.ILD_TRANSPARENT,
ref hIcon);
}
return hIcon == IntPtr.Zero ? GetManagedIcon(shfi.hIcon) : GetManagedIcon(hIcon);
}
/// <summary>
/// Used to access system folder icons.
/// </summary>
/// <param name="size">Specify large or small icons.</param>
/// <param name="folderType">Specify open or closed FolderType.</param>
/// <param name="shfi">Return Folder Information</param>
/// <returns>System.Drawing.Icon</returns>
public static Icon GetFolderIcon(IconSize size, FolderType folderType, ref Shell32.SHFILEINFO shfi)
{
// Need to add size check, although errors generated at present!
Shell32.SHGetFileInfoConstants flags = Shell32.SHGetFileInfoConstants.SHGFI_TYPENAME | Shell32.SHGetFileInfoConstants.SHGFI_DISPLAYNAME | Shell32.SHGetFileInfoConstants.SHGFI_ICON | Shell32.SHGetFileInfoConstants.SHGFI_USEFILEATTRIBUTES;
if (FolderType.Open == folderType)
flags |= Shell32.SHGetFileInfoConstants.SHGFI_OPENICON;
if (IconSize.Small == size)
flags |= Shell32.SHGetFileInfoConstants.SHGFI_SMALLICON;
else
flags |= Shell32.SHGetFileInfoConstants.SHGFI_LARGEICON;
IntPtr hIml;
// Get the folder icon
shfi = new Shell32.SHFILEINFO();
if (Utils.IsSevenOrAbove()) // Windows 7 FIX
{
hIml = Shell32.SHGetFileInfo(Environment.GetFolderPath(Environment.SpecialFolder.System),
Shell32.FILE_ATTRIBUTE.DIRECTORY,
ref shfi,
(uint)Marshal.SizeOf(shfi),
flags);
}
else
{
hIml = Shell32.SHGetFileInfo(null,
Shell32.FILE_ATTRIBUTE.DIRECTORY,
ref shfi,
(uint)Marshal.SizeOf(shfi),
flags);
}
if (shfi.hIcon == IntPtr.Zero) return null;
if (!Utils.IsXpOrAbove()) return GetManagedIcon(shfi.hIcon);
// Get the System IImageList object from the Shell:
Guid iidImageList = new Guid("46EB5926-582E-4017-9FDF-E8998DAA0950");
Shell32.IImageList iImageList = null;
int ret = Shell32.SHGetImageList(
(int)size,
ref iidImageList,
ref iImageList
);
// the image list handle is the IUnknown pointer, but
// using Marshal.GetIUnknownForObject doesn't return
// the right value. It really doesn't hurt to make
// a second call to get the handle:
Shell32.SHGetImageListHandle((int)size, ref iidImageList, ref hIml);
IntPtr hIcon = IntPtr.Zero;
if (iImageList == null)
{
hIcon = Comctl32.ImageList_GetIcon(
hIml,
shfi.iIcon,
(int)Comctl32.ImageListDrawItemConstants.ILD_TRANSPARENT);
}
else
{
iImageList.GetIcon(
shfi.iIcon,
(int)Comctl32.ImageListDrawItemConstants.ILD_TRANSPARENT,
ref hIcon);
}
return hIcon == IntPtr.Zero ? GetManagedIcon(shfi.hIcon) : GetManagedIcon(hIcon);
}
/// <summary>
/// Extract the icon from file, and return icon information
/// </summary>
/// <param name="path">File path,
/// such as ex: "C:\\Program Files\\NetMeeting\\conf.exe,1".</param>
/// <param name="size">The desired icon size</param>
/// <param name="shfi">The icon size</param>
/// <returns>This method always returns an icon with the especified size and thier information.</returns>
public static Icon ExtractIconFromFileEx(string path, IconSize size, ref Shell32.SHFILEINFO shfi)
{
EmbeddedIconInfo embeddedIcon = GetEmbeddedIconInfo(Environment.ExpandEnvironmentVariables(path));
//Gets the handle of the icon.
return GetFileIcon(embeddedIcon.FileName, size, false, ref shfi);
}
