shlobj.h

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//     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, LPVOID * ppvObj) 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, LPVOID * ppvObj) 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;

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

typedef IExtractIconW * LPEXTRACTICONW;

#ifdef UNICODE
#define IExtractIcon        IExtractIconW
#define IExtractIconVtbl    IExtractIconWVtbl
#define LPEXTRACTICON       LPEXTRACTICONW
#else
#define IExtractIcon        IExtractIconA
#define IExtractIconVtbl    IExtractIconAVtbl
#define LPEXTRACTICON       LPEXTRACTICONA
#endif

//===========================================================================
//
// IShellIcon Interface
//
// used to get a icon index for a IShellFolder object.
//
// this interface can be implemented by a IShellFolder, as a quick way to
// return the icon for a object in the folder.
//
// a instance of this interface is only created once for the folder, unlike
// IExtractIcon witch is created once for each object.
//
// if a ShellFolder does not implement this interface, the standard
// GetUIObject(....IExtractIcon) method will be used to get a icon
// for all objects.
//
// the following standard imagelist indexs can be returned:
//
//      0   document (blank page) (not associated)
//      1   document (with stuff on the page)
//      2   application (exe, com, bat)
//      3   folder (plain)
//      4   folder (open)
//
// IShellIcon:GetIconOf(pidl, flags, lpIconIndex)
//
//      pidl            object to get icon for.
//      flags           GIL_* input flags (GIL_OPEN, ...)
//      lpIconIndex     place to return icon index.
//
//  returns:
//      NOERROR, if lpIconIndex contains the correct system imagelist index.
//      S_FALSE, if unable to get icon for this object, go through
//               GetUIObject, IExtractIcon, methods.
//
//===========================================================================

#undef  INTERFACE
#define INTERFACE   IShellIcon

DECLARE_INTERFACE_(IShellIcon, IUnknown)      // shi
{
    // *** IUnknown methods ***
    STDMETHOD(QueryInterface) (THIS_ REFIID riid, LPVOID * ppvObj) PURE;
    STDMETHOD_(ULONG,AddRef) (THIS)  PURE;
    STDMETHOD_(ULONG,Release) (THIS) PURE;

    // *** IShellIcon methods ***
    STDMETHOD(GetIconOf)(THIS_ LPCITEMIDLIST pidl, UINT flags,
                    LPINT lpIconIndex) PURE;
};

typedef IShellIcon *LPSHELLICON;

//===========================================================================
//
// IShellIconOverlayIdentifier
//
// Used to identify a file as a member of the group of files that have this specific 
// icon overlay
//
// Users can create new IconOverlayIdentifiers and place them in the following registry
// location together with the Icon overlay image and their priority. 
// HKEY_LOCAL_MACHINE "Software\\Microsoft\\Windows\\CurrentVersion\\ShellIconOverlayIdentifiers"
// 
// The shell will enumerate through all IconOverlayIdentifiers at start, and prioritize 
// them according to internal rules, in case the internal rules don't apply, we use their 
// input priority
//
// IShellIconOverlayIdentifier:IsMemberOf(LPCWSTR pwszPath, DWORD dwAttrib)
//      pwszPath        full path of the file
//      dwAttrib        attribute of this file 
//
//  returns:
//      S_OK,    if the file is a member
//      S_FALSE, if the file is not a member
//      E_FAIL,  if the operation failed due to bad WIN32_FIND_DATA
//
// IShellIconOverlayIdentifier::GetOverlayInfo(LPWSTR pwszIconFile, int * pIndex, DWORD * dwFlags) PURE;
//      pszIconFile    the path of the icon file
//      pIndex         Depend on the flags, this could contain the IconIndex or the Sytem Imagelist Index
//      dwFlags        defined below
//
// IShellIconOverlayIdentifier::GetPriority(int * pIPriority) PURE;
//      pIPriority     the priority of this Overlay Identifier
//
//===========================================================================

#undef  INTERFACE
#define INTERFACE   IShellIconOverlayIdentifier

DECLARE_INTERFACE_(IShellIconOverlayIdentifier, IUnknown)
{
    // *** IUnknown methods ***
    STDMETHOD(QueryInterface) (THIS_ REFIID riid, LPVOID * ppvObj) PURE;
    STDMETHOD_(ULONG,AddRef) (THIS)  PURE;
    STDMETHOD_(ULONG,Release) (THIS) PURE;

    // *** IShellIconOverlayIdentifier methods ***
    STDMETHOD (IsMemberOf)(THIS_ LPCWSTR pwszPath, DWORD dwAttrib) PURE;  
    STDMETHOD (GetOverlayInfo)(THIS_ LPWSTR pwszIconFile, int cchMax, int * pIndex, DWORD * pdwFlags) PURE;  
    STDMETHOD (GetPriority)(THIS_ int * pIPriority) PURE;
};

#define ISIOI_ICONFILE            0x00000001          // path is returned through pwszIconFile
#define ISIOI_ICONINDEX           0x00000002          // icon index in pwszIconFile is returned through pIndex 
#define ISIOI_SYSIMAGELISTINDEX   0x00000004          // system imagelist icon index is returned through pIndex


//===========================================================================
//
// IShellIconOverlay
//
// Used to return the icon overlay index or its icon index for an IShellFolder object, 
// this is always implemented with IShellFolder 
//
// IShellIconOverlay:GetOverlayIndex(LPCITEMIDLIST pidl, DWORD * pdwIndex)
//      pidl            object to identify icon overlay for.
//      pdwIndex        the Overlay Index in the system image list
//
// IShellIconOverlay:GetOverlayIconIndex(LPCITEMIDLIST pidl, DWORD * pdwIndex)
//      pdwIconIndex    the Overlay Icon index in the system image list 
// This method is only used for those who are interested in seeing the real bits 
// of the Overlay Icon
//
//  returns:
//      S_OK,  if the index of an Overlay is found
//      S_FALSE, if no Overlay exists for this file
//      E_FAIL, if pidl is bad 
//
//===========================================================================

#undef  INTERFACE
#define INTERFACE   IShellIconOverlay

DECLARE_INTERFACE_(IShellIconOverlay, IUnknown)
{
    // *** IUnknown methods ***
    STDMETHOD(QueryInterface) (THIS_ REFIID riid, LPVOID * ppvObj) PURE;
    STDMETHOD_(ULONG,AddRef) (THIS)  PURE;
    STDMETHOD_(ULONG,Release) (THIS) PURE;

    // *** IShellIconOverlay methods ***
    STDMETHOD(GetOverlayIndex)(THIS_ LPCITEMIDLIST pidl, int * pIndex) PURE;
    STDMETHOD(GetOverlayIconIndex)(THIS_ LPCITEMIDLIST pidl, int * pIconIndex) PURE;
};

//===========================================================================
//
// IShellLink Interface
//
//===========================================================================

#ifdef UNICODE
#define IShellLink      IShellLinkW
#define IShellLinkVtbl  IShellLinkWVtbl
#else
#define IShellLink      IShellLinkA
#define IShellLinkVtbl  IShellLinkAVtbl
#endif

// IShellLink::Resolve fFlags
typedef enum {
    SLR_NO_UI           = 0x0001,
    SLR_ANY_MATCH       = 0x0002,
    SLR_UPDATE          = 0x0004,
    SLR_NOUPDATE        = 0x0008,
} SLR_FLAGS;

// IShellLink::GetPath fFlags
typedef enum {
    SLGP_SHORTPATH      = 0x0001,
    SLGP_UNCPRIORITY    = 0x0002,
    SLGP_RAWPATH        = 0x0004,
} SLGP_FLAGS;