private SystemImageList(bool useSmallIcons)
{
//JY: We use static instances here without IDisposable here because the system image list is allocated
// to us by shell32, and we only get one per process for a given icon size. Even doing an ImageList_Destroy
// in a destructor can cause funny business.
const int FILE_ATTRIBUTE_NORMAL = 0x80;
// retrieve the info for a fake file so we can get the image list handle.
Native.SHFILEINFO shInfo = new Native.SHFILEINFO();
Native.SHGFI uFlags = Native.SHGFI.SHGFI_USEFILEATTRIBUTES | Native.SHGFI.SHGFI_SYSICONINDEX;
if (useSmallIcons)
{
uFlags |= Native.SHGFI.SHGFI_SMALLICON;
}
else
{
uFlags |= Native.SHGFI.SHGFI_LARGEICON;
}
_handle = Native.Shell32.SHGetFileInfo(".txt", FILE_ATTRIBUTE_NORMAL, out shInfo, (uint)Marshal.SizeOf(shInfo), uFlags);
}
public ShellItem()
{
_rootItem = this;
try
{
// create a PIDL for the Desktop shell item.
_pidl = new Pidl(Environment.SpecialFolder.Desktop);
var shInfo = new Native.SHFILEINFO();
Native.Shell32.SHGetFileInfo((IntPtr)_pidl, 0, out shInfo, (uint)Marshal.SizeOf(shInfo), SHGFI.SHGFI_PIDL | SHGFI.SHGFI_DISPLAYNAME | SHGFI.SHGFI_SYSICONINDEX);
// get the root IShellFolder interface
int hResult = Native.Shell32.SHGetDesktopFolder(ref _shellFolder);
if (hResult != 0)
{
Marshal.ThrowExceptionForHR(hResult);
}
_displayName = shInfo.szDisplayName;
_typeName = string.Empty;
_iconIndex = shInfo.iIcon;
_isFolder = true;
_isVirtual = true;
_hasSubFolders = true;
}
catch (Exception ex)
{
// if an exception happens during construction, we must release the PIDL now (remember, it's a pointer!)
if (_pidl != null)
{
_pidl.Dispose();
}
throw new Exception("Creation of the root namespace shell item failed.", ex);
}
#if DEBUG
_instanceCount++;
#endif
}
public ShellItem(Pidl pidl, ShellItem parentShellItem, bool relativePidl)
{
int hResult;
_rootItem = parentShellItem._rootItem;
try
{
IntPtr tempPidl;
if (relativePidl)
{
_pidl = new Pidl(parentShellItem.Pidl, pidl);
tempPidl = (IntPtr)pidl; // use the relative one from parameters
}
else
{
_pidl = pidl.Clone();
tempPidl = (IntPtr)_pidl; // use the absolute one that we constructed just now
}
const Native.SHGFI flags = Native.SHGFI.SHGFI_PIDL // indicates that we're specifying the item by PIDL
| Native.SHGFI.SHGFI_DISPLAYNAME // indicates that we want the item's display name
| Native.SHGFI.SHGFI_SYSICONINDEX // indicates that we want the item's icon's index in the system image list
| Native.SHGFI.SHGFI_ATTRIBUTES // indicates that we want the item's attributes
| Native.SHGFI.SHGFI_TYPENAME; // indicates that we want the item's type name
Native.SHFILEINFO shInfo = new Native.SHFILEINFO();
Native.Shell32.SHGetFileInfo((IntPtr)_pidl, 0, out shInfo, (uint)Marshal.SizeOf(shInfo), flags);
// read item attributes
Native.SFGAO attributeFlags = (Native.SFGAO)shInfo.dwAttributes;
// create the item's IShellFolder interface
if ((attributeFlags & Native.SFGAO.SFGAO_FOLDER) != 0)
{
Guid iidIShellFolder = new Guid(IID.IID_IShellFolder);
if (_pidl == _rootItem._pidl)
{
// if the requested PIDL is the root namespace (the desktop) we can't use the the BindToObject method, so get it directly
hResult = Native.Shell32.SHGetDesktopFolder(ref _shellFolder);
}
else
{
if (relativePidl)
{
hResult = (int)parentShellItem._shellFolder.BindToObject(tempPidl, IntPtr.Zero, ref iidIShellFolder, out _shellFolder);
}
else
{
hResult = (int)_rootItem._shellFolder.BindToObject(tempPidl, IntPtr.Zero, ref iidIShellFolder, out _shellFolder);
}
}
if (hResult != 0)
{
// some objects are marked as folders, but really aren't and thus cannot be bound to an IShellFolder
// log these events for future study, but it's not exactly something to be concerned about in isolated cases.
// Marshal.ThrowExceptionForHR(hResult);
if ((attributeFlags & Native.SFGAO.SFGAO_HASSUBFOLDER) == 0)
{
attributeFlags = attributeFlags & ~Native.SFGAO.SFGAO_FOLDER;
}
}
}
_displayName = shInfo.szDisplayName;
_typeName = shInfo.szTypeName;
_iconIndex = shInfo.iIcon;
_isFolder = (attributeFlags & Native.SFGAO.SFGAO_FOLDER) != 0;
_isVirtual = (attributeFlags & Native.SFGAO.SFGAO_FILESYSTEM) == 0;
_hasSubFolders = (attributeFlags & Native.SFGAO.SFGAO_HASSUBFOLDER) != 0;
}
catch (UnauthorizedAccessException ex)
{
// if an exception happens during construction, we must release the PIDL now (remember, it's a pointer!)
var path = string.Empty;
if (_pidl != null)
{
path = _pidl.Path;
_pidl.Dispose();
}
throw new PathAccessException(path, ex);
}
catch (Exception ex)
{
// if an exception happens during construction, we must release the PIDL now (remember, it's a pointer!)
if (_pidl != null)
{
_pidl.Dispose();
}
throw new Exception("Creation of the specified shell item failed.", ex);
}
#if DEBUG
_instanceCount++;
#endif
}