shlobj.h

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#undef  INTERFACE
#define INTERFACE   IPersistFolder

DECLARE_INTERFACE_(IPersistFolder, IPersist)    // fld
{
    // *** IUnknown methods ***
    STDMETHOD(QueryInterface)(THIS_ REFIID riid, void **ppv) PURE;
    STDMETHOD_(ULONG,AddRef)(THIS)  PURE;
    STDMETHOD_(ULONG,Release)(THIS) PURE;

    // *** IPersist methods ***
    STDMETHOD(GetClassID)(THIS_ LPCLSID lpClassID) PURE;

    // *** IPersistFolder methods ***
    STDMETHOD(Initialize)(THIS_ LPCITEMIDLIST pidl) PURE;
};

typedef IPersistFolder *LPPERSISTFOLDER;

#if (_WIN32_IE >= 0x0400)

#undef  INTERFACE
#define INTERFACE   IPersistFolder2

DECLARE_INTERFACE_(IPersistFolder2, IPersistFolder)
{
    // *** IUnknown methods ***
    STDMETHOD(QueryInterface)(THIS_ REFIID riid, void **ppv) PURE;
    STDMETHOD_(ULONG,AddRef)(THIS)  PURE;
    STDMETHOD_(ULONG,Release)(THIS) PURE;

    // *** IPersist methods ***
    STDMETHOD(GetClassID)(THIS_ LPCLSID lpClassID) PURE;

    // *** IPersistFolder methods ***
    STDMETHOD(Initialize)(THIS_ LPCITEMIDLIST pidl) PURE;

    // *** IPersistFolder2 methods ***
    STDMETHOD(GetCurFolder)(THIS_ LPITEMIDLIST *ppidl) PURE;
};

#if (_WIN32_IE >= 0x0401)
typedef IPersistFolder2 *LPPERSISTFOLDER2;
#endif

#endif

#if (_WIN32_IE >= 0x0500)
#undef  INTERFACE
#define INTERFACE   IPersistFolder3

#define CSIDL_FLAG_PFTI_TRACKTARGET CSIDL_FLAG_DONT_VERIFY

// DESCRIPTION: PERSIST_FOLDER_TARGET_INFO
//    This stucture is used for Folder Shortcuts which allow the shell to
// have a file system folder act like another area in the name space.
// One of pidlTargetFolder, szTargetParsingName, or csidl needs to
// specify the destination name space.
//
// pidlTargetFolder: This is a full pidl to the target folder.  Can be NULL in the IPersistFolder3::InitializeEx()
//                   call but not in the GetFolderTargetInfo() return structure.
// szTargetParsingName: Empty string if not specified. Ortherwise, it is the parsible name
//                       to the target.  This name can be parsed by IShellFolder::
//                       ParseDisplayName() from the desktop.
// szNetworkProvider: Can be an empty string.  If not empty, it specifies the type of network
//                    provider that will be used when binding to the target.  This is used
//                    for performance optimizations for the WNet APIs.
// dwAttributes: -1 if not known.  These are the SFGAO_ flags for IShellFolder::GetAttributesOf()
// csidl: This is -1 if it's not used.  This can be used instead of pidlTargetFolder or
//        szTargetParsingName to indicate the TargetFolder.  See the list of CSIDL_ folders
//        below.  CSIDL_FLAG_PFTI_TRACKTARGET means that the IShellFolder's target folder
//        should change if the user changes the target of the underlying CSIDL value.
//        You can also pass CSIDL_FLAG_CREATE to indicate that the target folder
//        should be created if it does not exist.  No other CSIDL_FLAG_* values are supported.
typedef struct
{
    LPITEMIDLIST  pidlTargetFolder;               // pidl for the folder we want to intiailize
    WCHAR         szTargetParsingName[MAX_PATH];  // optional parsing name for the target
    WCHAR         szNetworkProvider[MAX_PATH];    // optional network provider
    DWORD         dwAttributes;                   // optional FILE_ATTRIBUTES_ flags (-1 if not used)
    int           csidl;                          // optional folder index (SHGetFolderPath()) -1 if not used
} PERSIST_FOLDER_TARGET_INFO;


// DESCRIPTION: IPersistFolder3
//    This interface is implemented by an IShellFolder object that wants non-default
// handling of Folder Shortcuts.  In general, shell name space extensions should use
// pidlRoot (the alias pidl) as their location in the name space and pass it to public
// APIs, such as ShellExecute().  The one exception is that pidlTarget should be used
// when sending ChangeNotifies or registering to listen for change notifies
// (see SFVM_GETNOTIFY).
//
// InitializeEx: This method initializes an IShellFolder and specifies where
//               it is rooted in the name space.
//      pbc: May be NULL.
//      pidlRoot: This is the same parameter as IPersistFolder::Initialize(). Caller allocates
//                and frees this parameter.
//      ppfti: May be NULL, in which case this is the same as a call to IPersistFolder::Initialize().
//             Otherwise this is a Folder Shortcut and this struction specifies the target
//             folder and it's attributes.
// GetFolderTargetInfo: This is used by the caller to find information about
//             the folder shortcut.  This structure may not be initialized by the caller,
//             so the callee needs to initialize every member.  The callee allocates
//             pidlTargetFolder and the caller will free it.  Filling in pidlTargetFolder is
//             ALWAYS required.

DECLARE_INTERFACE_(IPersistFolder3, IPersistFolder2)
{
    // *** IUnknown methods ***
    STDMETHOD(QueryInterface)(THIS_ REFIID riid, void **ppv) PURE;
    STDMETHOD_(ULONG,AddRef)(THIS)  PURE;
    STDMETHOD_(ULONG,Release)(THIS) PURE;

    // *** IPersist methods ***
    STDMETHOD(GetClassID)(THIS_ LPCLSID lpClassID) PURE;

    // *** IPersistFolder methods ***
    STDMETHOD(Initialize)(THIS_ LPCITEMIDLIST pidl) PURE;

    // *** IPersistFolder2 methods ***
    STDMETHOD(GetCurFolder)(THIS_ LPITEMIDLIST *ppidl) PURE;

    // *** IPersistFolder3 methods ***
    STDMETHOD(InitializeEx)(THIS_ IBindCtx *pbc, LPCITEMIDLIST pidlRoot, const PERSIST_FOLDER_TARGET_INFO *ppfti) PURE;
    STDMETHOD(GetFolderTargetInfo)(THIS_ PERSIST_FOLDER_TARGET_INFO *ppfti) PURE;
};

//
//  this interface is just the IID.  return back
//  a pointer to the IPersist interface if the object
//  implementation is free threaded.  this is used
//  for performance on free threaded objects.
//
#define IPersistFreeThreadedObject IPersist

#endif

//

//===========================================================================
//
// IRemoteComputer Interface
//
//  The IRemoteComputer interface is used to initialize a name space
// extension invoked on a remote computer object.
//
// [Member functions]
//
// IRemoteComputer::Initialize
//
//  This member function is called when the explorer is initializing or
// enumerating the name space extension. If failure is returned during
// enumeration, the extension won't appear for this computer. Otherwise,
// the extension will appear, and should target the given machine.
//
//  Parameters:
//   pszMachine -- Specifies the name of the machine to target.
//
//===========================================================================

#undef  INTERFACE
#define INTERFACE   IRemoteComputer

DECLARE_INTERFACE_(IRemoteComputer, IUnknown)    // remc
{
    // *** IUnknown methods ***
    STDMETHOD(QueryInterface) (THIS_ REFIID riid, void **ppv) PURE;
    STDMETHOD_(ULONG,AddRef) (THIS)  PURE;
    STDMETHOD_(ULONG,Release) (THIS) PURE;

    // *** IRemoteComputer methods ***
    STDMETHOD(Initialize) (THIS_ const WCHAR *pszMachine, BOOL bEnumerating) PURE;
};

//===========================================================================
//
// IExtractIcon interface
//
//  This interface is used in two different places in the shell.
//
// Case-1: Icons of sub-folders for the scope-pane of the explorer.
//
//  It is used by the explorer to get the "icon location" of
// sub-folders from each shell folders. When the user expands a folder
// in the scope pane of the explorer, the explorer does following:
//  (1) binds to the folder (gets IShellFolder),
//  (2) enumerates its sub-folders by calling its EnumObjects member,
//  (3) calls its GetUIObjectOf member to get IExtractIcon interface
//     for each sub-folders.
//  In this case, the explorer uses only IExtractIcon::GetIconLocation
// member to get the location of the appropriate icon. An icon location
// always consists of a file name (typically DLL or EXE) and either an icon
// resource or an icon index.
//
//
// Case-2: Extracting an icon image from a file
//
//  It is used by the shell when it extracts an icon image
// from a file. When the shell is extracting an icon from a file,
// it does following:
//  (1) creates the icon extraction handler object (by getting its CLSID
//     under the {ProgID}\shell\ExtractIconHanler key and calling
//     CoCreateInstance requesting for IExtractIcon interface).
//  (2) Calls IExtractIcon::GetIconLocation.
//  (3) Then, calls IExtractIcon::ExtractIcon with the location/index pair.
//  (4) If (3) returns NOERROR, it uses the returned icon.
//  (5) Otherwise, it recursively calls this logic with new location
//     assuming that the location string contains a fully qualified path name.
//
//  From extension programmer's point of view, there are only two cases
// where they provide implementations of IExtractIcon:
//  Case-1) providing explorer extensions (i.e., IShellFolder).
//  Case-2) providing per-instance icons for some types of files.
//
// Because Case-1 is described above, we'll explain only Case-2 here.
//
// When the shell is about display an icon for a file, it does following:
//  (1) Finds its ProgID and ClassID.
//  (2) If the file has a ClassID, it gets the icon location string from the
//    "DefaultIcon" key under it. The string indicates either per-class
//    icon (e.g., "FOOBAR.DLL,2") or per-instance icon (e.g., "%1,1").
//  (3) If a per-instance icon is specified, the shell creates an icon
//    extraction handler object for it, and extracts the icon from it
//    (which is described above).
//
//  It is important to note that the shell calls IExtractIcon::GetIconLocation
// first, then calls IExtractIcon::Extract. Most application programs
// that support per-instance icons will probably store an icon location
// (DLL/EXE name and index/id) rather than an icon image in each file.
// In those cases, a programmer needs to implement only the GetIconLocation
// member and it Extract member simply returns S_FALSE. They need to
// implement Extract member only if they decided to store the icon images
// within files themselved or some other database (which is very rare).
//
//
//
// [Member functions]
//
//
// IExtractIcon::GetIconLocation
//
//  This function returns an icon location.
//
//  Parameters:
//   uFlags     [in]  -- Specifies if it is opened or not (GIL_OPENICON or 0)
//   szIconFile [out] -- Specifies the string buffer buffer for a location name.
//   cchMax     [in]  -- Specifies the size of szIconFile (almost always MAX_PATH)
//   piIndex    [out] -- Sepcifies the address of UINT for the index.
//   pwFlags    [out] -- Returns GIL_* flags
//  Returns:
//   NOERROR, if it returns a valid location; S_FALSE, if the shell use a
//   default icon.
//
//  Notes: The location may or may not be a path to a file. The caller can
//   not assume anything unless the subsequent Extract member call returns
//   S_FALSE.
//
//   if the returned location is not a path to a file, GIL_NOTFILENAME should
//   be set in the returned flags.
//
// IExtractIcon::Extract
//
//  This function extracts an icon image from a specified file.
//
//  Parameters:
//   pszFile [in] -- Specifies the icon location (typically a path to a file).
//   nIconIndex [in] -- Specifies the icon index.
//   phiconLarge [out] -- Specifies the HICON variable for large icon.
//   phiconSmall [out] -- Specifies the HICON variable for small icon.
//   nIconSize [in] -- Specifies the size icon required (size of large icon)
//                     LOWORD is the requested large icon size
//                     HIWORD is the requested small icon size
//  Returns:
//   NOERROR, if it extracted the from the file.
//   S_FALSE, if the caller should extract from the file specified in the
//           location.
//
//===========================================================================

// GetIconLocation() input flags

#define GIL_OPENICON     0x0001      // allows containers to specify an "open" look
#define GIL_FORSHELL     0x0002      // icon is to be displayed in a ShellFolder
#define GIL_ASYNC        0x0020      // this is an async extract, return E_ASYNC

// GetIconLocation() return flags

#define GIL_SIMULATEDOC  0x0001      // simulate this document icon for this
#define GIL_PERINSTANCE  0x0002      // icons from this class are per instance (each file has its own)
#define GIL_PERCLASS     0x0004      // icons from this class per class (shared for all files of this type)
#define GIL_NOTFILENAME  0x0008      // location is not a filename, must call ::ExtractIcon
#define GIL_DONTCACHE    0x0010      // this icon should not be cached

#undef  INTERFACE
#define INTERFACE   IExtractIconA

DECLARE_INTERFACE_(IExtractIconA, IUnknown)     // exic
{
    // *** IUnknown methods ***
    STDMETHOD(QueryInterface) (THIS_ REFIID riid, void **ppv) PURE;
    STDMETHOD_(ULONG,AddRef) (THIS)  PURE;
    STDMETHOD_(ULONG,Release) (THIS) PURE;

    // *** IExtractIcon methods ***
    STDMETHOD(GetIconLocation)(THIS_
                         UINT   uFlags,
                         LPSTR  szIconFile,
                         UINT   cchMax,
                         int   * piIndex,
                         UINT  * pwFlags) PURE;

    STDMETHOD(Extract)(THIS_
                           LPCSTR pszFile,
                           UINT   nIconIndex,
                           HICON   *phiconLarge,
                           HICON   *phiconSmall,
                           UINT    nIconSize) PURE;
};

typedef IExtractIconA * LPEXTRACTICONA;

#undef  INTERFACE
#define INTERFACE   IExtractIconW

DECLARE_INTERFACE_(IExtractIconW, IUnknown)     // exic
{
    // *** IUnknown methods ***
    STDMETHOD(QueryInterface) (THIS_ REFIID riid, void **ppv) PURE;
    STDMETHOD_(ULONG,AddRef) (THIS)  PURE;
    STDMETHOD_(ULONG,Release) (THIS) PURE;

    // *** IExtractIcon methods ***
    STDMETHOD(GetIconLocation)(THIS_
                         UINT   uFlags,
                         LPWSTR szIconFile,
                         UINT   cchMax,
                         int   * piIndex,
                         UINT  * pwFlags) PURE;