NSE：在SaveAs（IFileSaveDialog）对话框中显示虚拟路径而不是文件系统路径

Question

这是我第一次在StackOverflow上发布内容。我正在拼命寻找一个没有真正记录的主题的解决方案。

我们开发了一个集成在Windows中的DMS（文件系统/云服务）解决方案作为命名空间扩展。这个解决方案工作正常，NSE在IFileSaveDialog中可见，我们可以直接在其中保存文件。

我的问题是，我希望能够在Word，Excel，Notepad等应用程序中打开SaveAs对话框时显示虚拟路径，而不是文件系统路径。（以前在命名空间扩展中打开了使用过的文件）。

我知道我们可以在IFilSaveDialog.SetSaveAsItem中传递一个IShellItem作为参数，但它是否具有所需的效果（给定的项具有属性SFGAO_FILESYSTEM）然后，当在一个中使用SaveAs时，我怎么可能挂钩它？标准的Windows应用程序？

也许我完全错了，并且有一种非常秘密的解决方法（我甚至试图模拟拖放Winword.exe等应用程序，所以我真的陷入了困境）。但我确信（即使很复杂），有一个解决方案，因为Windows集成了虚拟文件夹，例如＆＃34;我的文档＆＃34;在SaveAs对话框中。

非常感谢你的帮助。

Answer 1

标准Windows应用程序是为使用CreateFile等功能处理真实文件而开发的。此类功能无法与虚拟文件一起使用。如果在标准SaveAs对话框中看到虚拟文件夹，则仅表示虚拟文件夹具有SFGAO_FILESYSANCESTOR属性。 Windows显示此类文件夹，但它等待该文件夹包含具有SFGAO_FILESYSTEM属性的对象。所以我认为没有任何解决方案。

Answer 2

我从来没有在这里回答过。但最终我找到了解决方案。

Denis Anisimov在写作时是对的：

  

如果在标准SaveAs对话框中看到虚拟文件夹，则仅表示虚拟文件夹具有SFGAO_FILESYSANCESTOR属性。 Windows显示此类文件夹但等待该文件夹包含具有SFGAO_FILESYSTEM属性的对象。

不幸的是，在Windows 10上，文件夹必须具有这两个属性。但那不是重点。

所以答案是“让系统认为你的对象是一个文件系统对象并自己处理文件保存过程”

所以你不应该使用文件系统路径作为你的对象显示名称（否则你已经完成了），然后在虚拟对象的类中实现接口IObjectWithSite（感谢ArielB的帖子！）并处理对象自己保存动作 - 在我的情况下，在temp文件夹中下载文件并启动Filesystemwatcher - 。

我发布了一些代码摘录。您还需要开发自己的IFileDialogEvents实现。

    public NativeMethods.HRESULT GetSite(ref Guid riid, out IntPtr ppvSite)
    {
        if (PUnkSite != IntPtr.Zero)
        {
            Marshal.QueryInterface(PUnkSite, ref riid, out ppvSite);
            return NativeMethods.HRESULT.S_OK;
        }

        ppvSite = IntPtr.Zero;
        return NativeMethods.HRESULT.S_FALSE;
    }


    public void SetSite(IntPtr pUnkSite)
    {
        if (PUnkSite != IntPtr.Zero)
        {
            Marshal.Release(PUnkSite);

            if (FileSaveDialog != null)
            {
                FileSaveDialog.Unadvise(DwCookie);
                Marshal.ReleaseComObject(FileSaveDialog);
                FileSaveDialog = null;
                DwCookie = 0;
            }
            else if (FileOpenDialog != null)
            {
                FileOpenDialog.Unadvise(DwCookie);
                Marshal.ReleaseComObject(FileOpenDialog);
                FileOpenDialog = null;
                DwCookie = 0;
            }
        }

        PUnkSite = pUnkSite;
        if (PUnkSite == IntPtr.Zero) return;
        Marshal.AddRef(PUnkSite);

        Guid iFileSaveDialogGuid = typeof (NativeMethods.IFileSaveDialog).GUID;
        IntPtr iFileSaveDialogPointer;

        NativeMethods.IUnknown_QueryService(pUnkSite, ref NativeMethods.SID_SExplorerBrowserFrame, ref iFileSaveDialogGuid, out iFileSaveDialogPointer);

        if (iFileSaveDialogPointer != IntPtr.Zero)
        {
            FileSaveDialog = (NativeMethods.IFileSaveDialog) Marshal.GetObjectForIUnknown(iFileSaveDialogPointer);

            Marshal.Release(iFileSaveDialogPointer);

            if (FileSaveDialog == null) return;

            FileDialogEvents dialogEvents = new FileDialogEvents(ConnectorName, FileDialogEvents.FileSaveType,
                ObjectMetadata.ObjectAddress, ObjectMetadata.ObjectClass);

            FileSaveDialog.Advise(dialogEvents, out DwCookie);
            return;
        }

        Guid iFileOpenDialogGuid = typeof(NativeMethods.IFileOpenDialog).GUID;
        IntPtr iFileOpenDialogPointer;

        NativeMethods.IUnknown_QueryService(pUnkSite, ref NativeMethods.SID_SExplorerBrowserFrame, ref iFileOpenDialogGuid, out iFileOpenDialogPointer);
        if (iFileOpenDialogPointer == IntPtr.Zero) return;

        FileOpenDialog = (NativeMethods.IFileOpenDialog)Marshal.GetObjectForIUnknown(iFileOpenDialogPointer);

        Marshal.Release(iFileOpenDialogPointer);

        if (FileOpenDialog == null) return;

        FileDialogEvents dialogEventsOpen = new FileDialogEvents(ConnectorName, FileDialogEvents.FileOpenType,
            ObjectMetadata.ObjectAddress, ObjectMetadata.ObjectClass);

        FileOpenDialog.Advise(dialogEventsOpen, out DwCookie);
    }

此处还有COM对象（在NativeMethods中定义）：

    public static Guid SID_SExplorerBrowserFrame = new Guid("000214F1-0000-0000-C000-000000000046"); // SID_SExplorerBrowserFrame

    [ComImport, Guid("FC4801A3-2BA9-11CF-A229-00AA003D7352"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IObjectWithSite
    {
        void SetSite([In] IntPtr pUnkSite);

        HRESULT GetSite(ref Guid guid, out IntPtr ppvSite);
    }

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto, Pack = 4)]
    public struct COMDLG_FILTERSPEC
    {
        [MarshalAs(UnmanagedType.LPWStr)]
        public string pszName;

        [MarshalAs(UnmanagedType.LPWStr)]
        public string pszSpec;
    }

    [Flags]
    public enum FOS : uint
    {
        FOS_OVERWRITEPROMPT = 0x00000002,
        FOS_STRICTFILETYPES = 0x00000004,
        FOS_NOCHANGEDIR = 0x00000008,
        FOS_PICKFOLDERS = 0x00000020,
        FOS_FORCEFILESYSTEM = 0x00000040, // Ensure that items returned are filesystem items.
        FOS_ALLNONSTORAGEITEMS = 0x00000080, // Allow choosing items that have no storage.
        FOS_NOVALIDATE = 0x00000100,
        FOS_ALLOWMULTISELECT = 0x00000200,
        FOS_PATHMUSTEXIST = 0x00000800,
        FOS_FILEMUSTEXIST = 0x00001000,
        FOS_CREATEPROMPT = 0x00002000,
        FOS_SHAREAWARE = 0x00004000,
        FOS_NOREADONLYRETURN = 0x00008000,
        FOS_NOTESTFILECREATE = 0x00010000,
        FOS_HIDEMRUPLACES = 0x00020000,
        FOS_HIDEPINNEDPLACES = 0x00040000,
        FOS_NODEREFERENCELINKS = 0x00100000,
        FOS_DONTADDTORECENT = 0x02000000,
        FOS_FORCESHOWHIDDEN = 0x10000000,
        FOS_DEFAULTNOMINIMODE = 0x20000000
    }

    [Flags]
    public enum FDAP
    {
        FDAP_BOTTOM = 0,
        FDAP_TOP = 1
    }

    [ComImport, Guid("B63EA76D-1F85-456F-A19C-48159EFA858B"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IShellItemArray
    {
        // Not supported: IBindCtx
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void BindToHandler([In, MarshalAs(UnmanagedType.Interface)] IntPtr pbc, [In] ref Guid rbhid,
                     [In] ref Guid riid, out IntPtr ppvOut);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetPropertyStore([In] int Flags, [In] ref Guid riid, out IntPtr ppv);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetPropertyDescriptionList([In] ref PROPERTYKEY keyType, [In] ref Guid riid, out IntPtr ppv);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetAttributes([In] SIATTRIBFLAGS dwAttribFlags, [In] uint sfgaoMask, out uint psfgaoAttribs);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetCount(out uint pdwNumItems);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetItemAt([In] uint dwIndex, [MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);

        // Not supported: IEnumShellItems (will use GetCount and GetItemAt instead)
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void EnumItems([MarshalAs(UnmanagedType.Interface)] out IntPtr ppenumShellItems);
    }

    [StructLayout(LayoutKind.Sequential, Pack = 4)]
    public struct PROPERTYKEY
    {
        public Guid fmtid;
        public uint pid;
    }

    public enum SIATTRIBFLAGS
    {
        SIATTRIBFLAGS_AND = 1,
        SIATTRIBFLAGS_APPCOMPAT = 3,
        SIATTRIBFLAGS_OR = 2
    }

    [ComImport, Guid("d57c7288-d4ad-4768-be02-9d969532d960"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IFileOpenDialog : IFileDialog
    {
        // Defined on IModalWindow - repeated here due to requirements of COM interop layer
        // --------------------------------------------------------------------------------
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime), PreserveSig]
        int Show([In] IntPtr parent);

        // Defined on IFileDialog - repeated here due to requirements of COM interop layer
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFileTypes([In] uint cFileTypes, [In] COMDLG_FILTERSPEC[] rgFilterSpec);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFileTypeIndex([In] uint iFileType);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetFileTypeIndex(out uint piFileType);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void Advise([In, MarshalAs(UnmanagedType.Interface)] IFileDialogEvents pfde, out uint pdwCookie);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void Unadvise([In] uint dwCookie);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetOptions([In] FOS fos);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetOptions(out FOS pfos);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetDefaultFolder([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFolder([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetFolder([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetCurrentSelection([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFileName([In, MarshalAs(UnmanagedType.LPWStr)] string pszName);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetFileName([MarshalAs(UnmanagedType.LPWStr)] out string pszName);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetTitle([In, MarshalAs(UnmanagedType.LPWStr)] string pszTitle);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetOkButtonLabel([In, MarshalAs(UnmanagedType.LPWStr)] string pszText);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFileNameLabel([In, MarshalAs(UnmanagedType.LPWStr)] string pszLabel);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetResult([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void AddPlace([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi, FDAP fdap);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetDefaultExtension([In, MarshalAs(UnmanagedType.LPWStr)] string pszDefaultExtension);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void Close([MarshalAs(UnmanagedType.Error)] int hr);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetClientGuid([In] ref Guid guid);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void ClearClientData();

        // Not supported:  IShellItemFilter is not defined, converting to IntPtr
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFilter([MarshalAs(UnmanagedType.Interface)] IntPtr pFilter);

        // Defined by IFileOpenDialog
        // ---------------------------------------------------------------------------------
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetResults([MarshalAs(UnmanagedType.Interface)] out IShellItemArray ppenum);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetSelectedItems([MarshalAs(UnmanagedType.Interface)] out IShellItemArray ppsai);
    }

    [ComImport, Guid("84bccd23-5fde-4cdb-aea4-af64b83d78ab"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IFileSaveDialog : IFileDialog
    {
        // Defined on IModalWindow - repeated here due to requirements of COM interop layer
        // --------------------------------------------------------------------------------
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime), PreserveSig]
        int Show([In] IntPtr parent);

        // Defined on IFileDialog - repeated here due to requirements of COM interop layer
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFileTypes([In] uint cFileTypes, [In] COMDLG_FILTERSPEC[] rgFilterSpec);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFileTypeIndex([In] uint iFileType);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetFileTypeIndex(out uint piFileType);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void Advise([In, MarshalAs(UnmanagedType.Interface)] IFileDialogEvents pfde, out uint pdwCookie);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void Unadvise([In] uint dwCookie);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetOptions([In] FOS fos);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetOptions(out FOS pfos);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetDefaultFolder([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFolder([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetFolder([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetCurrentSelection([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFileName([In, MarshalAs(UnmanagedType.LPWStr)] string pszName);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetFileName([MarshalAs(UnmanagedType.LPWStr)] out string pszName);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetTitle([In, MarshalAs(UnmanagedType.LPWStr)] string pszTitle);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetOkButtonLabel([In, MarshalAs(UnmanagedType.LPWStr)] string pszText);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFileNameLabel([In, MarshalAs(UnmanagedType.LPWStr)] string pszLabel);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetResult([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void AddPlace([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi, FDAP fdap);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetDefaultExtension([In, MarshalAs(UnmanagedType.LPWStr)] string pszDefaultExtension);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void Close([MarshalAs(UnmanagedType.Error)] int hr);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetClientGuid([In] ref Guid guid);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void ClearClientData();

        // Not supported:  IShellItemFilter is not defined, converting to IntPtr
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFilter([MarshalAs(UnmanagedType.Interface)] IntPtr pFilter);

        // Defined by IFileSaveDialog interface
        // -----------------------------------------------------------------------------------

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetSaveAsItem([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi);

        // Not currently supported: IPropertyStore
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetProperties([In, MarshalAs(UnmanagedType.Interface)] IntPtr pStore);

        // Not currently supported: IPropertyDescriptionList
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetCollectedProperties([In, MarshalAs(UnmanagedType.Interface)] IntPtr pList, [In] int fAppendDefault);

        // Not currently supported: IPropertyStore
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetProperties([MarshalAs(UnmanagedType.Interface)] out IntPtr ppStore);

        // Not currently supported: IPropertyStore, IFileOperationProgressSink
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void ApplyProperties([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi,
                       [In, MarshalAs(UnmanagedType.Interface)] IntPtr pStore,
                       [In, ComAliasName("ShellObjects.wireHWND")] ref IntPtr hwnd,
                       [In, MarshalAs(UnmanagedType.Interface)] IntPtr pSink);
    }

    [ComImport, Guid("42f85136-db7e-439c-85f1-e4075d135fc8"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IFileDialog : IModalWindow
    {
        // Defined on IModalWindow - repeated here due to requirements of COM interop layer
        // --------------------------------------------------------------------------------
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime), PreserveSig]
        int Show([In] IntPtr parent);

        // IFileDialog-Specific interface members
        // --------------------------------------------------------------------------------
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFileTypes([In] uint cFileTypes,
            [In, MarshalAs(UnmanagedType.LPArray)] COMDLG_FILTERSPEC[] rgFilterSpec);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFileTypeIndex([In] uint iFileType);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetFileTypeIndex(out uint piFileType);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void Advise([In, MarshalAs(UnmanagedType.Interface)] IFileDialogEvents pfde, out uint pdwCookie);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void Unadvise([In] uint dwCookie);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetOptions([In] FOS fos);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetOptions(out FOS pfos);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetDefaultFolder([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFolder([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetFolder([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetCurrentSelection([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFileName([In, MarshalAs(UnmanagedType.LPWStr)] string pszName);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetFileName([MarshalAs(UnmanagedType.LPWStr)] out string pszName);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetTitle([In, MarshalAs(UnmanagedType.LPWStr)] string pszTitle);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetOkButtonLabel([In, MarshalAs(UnmanagedType.LPWStr)] string pszText);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFileNameLabel([In, MarshalAs(UnmanagedType.LPWStr)] string pszLabel);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void GetResult([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void AddPlace([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi, FDAP fdap);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetDefaultExtension([In, MarshalAs(UnmanagedType.LPWStr)] string pszDefaultExtension);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void Close([MarshalAs(UnmanagedType.Error)] int hr);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetClientGuid([In] ref Guid guid);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void ClearClientData();

        // Not supported:  IShellItemFilter is not defined, converting to IntPtr
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void SetFilter([MarshalAs(UnmanagedType.Interface)] IntPtr pFilter);
    }

    [ComImport, Guid("b4db1657-70d7-485e-8e3e-6fcb5a5c1802"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IModalWindow
    {
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime), PreserveSig]
        int Show([In] IntPtr parent);
    }

    public enum HRESULT : long
    {
        S_FALSE = 0x0001,
        S_OK = 0x0000,
        E_INVALIDARG = 0x80070057,
        E_OUTOFMEMORY = 0x8007000E,
        STG_E_FILENOTFOUND = 0x80030002
    }

    public enum FDE_SHAREVIOLATION_RESPONSE
    {
        FDESVR_DEFAULT = 0x00000000,
        FDESVR_ACCEPT = 0x00000001,
        FDESVR_REFUSE = 0x00000002
    }

    public enum FDE_OVERWRITE_RESPONSE
    {
        FDEOR_DEFAULT = 0x00000000,
        FDEOR_ACCEPT = 0x00000001,
        FDEOR_REFUSE = 0x00000002
    }

    public enum Sigdn : uint
    {
        SigdnNormaldisplay = 0x00000000,
        SigdnParentrelativeparsing = 0x80018001,
        SigdnParentrelativeforaddressbar = 0x8001c001,
        SigdnDesktopabsoluteparsing = 0x80028000,
        SigdnParentrelativeediting = 0x80031001,
        SigdnDesktopabsoluteediting = 0x8004c000,
        SigdnFilesyspath = 0x80058000,
        SigdnUrl = 0x80068000
    }

    [DllImport("shlwapi.dll")]
    public static extern int IUnknown_QueryService(IntPtr pUnk, ref Guid guidService, ref Guid riid, out IntPtr ppvOut);

    [ComImport, Guid("973510DB-7D7F-452B-8975-74A85828D354"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IFileDialogEvents
    {
        // NOTE: some of these callbacks are cancelable - returning S_FALSE means that
        // the dialog should not proceed (e.g. with closing, changing folder); to
        // support this, we need to use the PreserveSig attribute to enable us to return
        // the proper HRESULT
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime), PreserveSig]
        HRESULT OnFileOk([In, MarshalAs(UnmanagedType.Interface)] IFileDialog pfd);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime), PreserveSig]
        HRESULT OnFolderChanging([In, MarshalAs(UnmanagedType.Interface)] IFileDialog pfd,
                       [In, MarshalAs(UnmanagedType.Interface)] IShellItem psiFolder);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void OnFolderChange([In, MarshalAs(UnmanagedType.Interface)] IFileDialog pfd);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void OnSelectionChange([In, MarshalAs(UnmanagedType.Interface)] IFileDialog pfd);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void OnShareViolation([In, MarshalAs(UnmanagedType.Interface)] IFileDialog pfd,
                    [In, MarshalAs(UnmanagedType.Interface)] IShellItem psi,
                    out FDE_SHAREVIOLATION_RESPONSE pResponse);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void OnTypeChange([In, MarshalAs(UnmanagedType.Interface)] IFileDialog pfd);

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void OnOverwrite([In, MarshalAs(UnmanagedType.Interface)] IFileDialog pfd,
                   [In, MarshalAs(UnmanagedType.Interface)] IShellItem psi,
                   out FDE_OVERWRITE_RESPONSE pResponse);
    }

    [DllImport("shell32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    internal static extern int SHCreateItemFromIDList(
         /*PCIDLIST_ABSOLUTE*/ IntPtr pidl,
    ref Guid riid,
    [MarshalAs(UnmanagedType.Interface)] out IShellItem ppv);