typedef struct tagHH_ENUM_IT
{
    int       cbStruct;          // size of this structure
    int       iType;             // the type of the information type ie. Inclusive, Exclusive, or Hidden
    LPCSTR    pszCatName;        // Set to the name of the Category to enumerate the info types in a category; else NULL
    LPCSTR    pszITName;         // volitile pointer to the name of the infotype. Allocated by call. Caller responsible for freeing
    LPCSTR    pszITDescription;  // volitile pointer to the description of the infotype.
} HH_ENUM_IT, *PHH_ENUM_IT;

typedef struct tagHH_ENUM_CAT
{
    int       cbStruct;          // size of this structure
    LPCSTR    pszCatName;        // volitile pointer to the category name
    LPCSTR    pszCatDescription; // volitile pointer to the category description
} HH_ENUM_CAT, *PHH_ENUM_CAT;

typedef struct tagHH_SET_INFOTYPE
{
    int       cbStruct;          // the size of this structure
    LPCSTR    pszCatName;        // the name of the category, if any, the InfoType is a member of.
    LPCSTR    pszInfoTypeName;   // the name of the info type to add to the filter
} HH_SET_INFOTYPE, *PHH_SET_INFOTYPE;

typedef DWORD HH_INFOTYPE;
typedef HH_INFOTYPE* PHH_INFOTYPE;

enum {
    HHWIN_NAVTAB_TOP,
    HHWIN_NAVTAB_LEFT,
    HHWIN_NAVTAB_BOTTOM,
};

#define HH_MAX_TABS 19  // maximum number of tabs

enum {
    HH_TAB_CONTENTS,
    HH_TAB_INDEX,
    HH_TAB_SEARCH,
    HH_TAB_FAVORITES,
    HH_TAB_HISTORY,
    HH_TAB_AUTHOR,

    HH_TAB_CUSTOM_FIRST = 11,
    HH_TAB_CUSTOM_LAST = HH_MAX_TABS
};

#define HH_MAX_TABS_CUSTOM (HH_TAB_CUSTOM_LAST - HH_TAB_CUSTOM_FIRST + 1)

// HH_DISPLAY_SEARCH Command Related Structures and Constants

#define HH_FTS_DEFAULT_PROXIMITY (-1)

typedef struct tagHH_FTS_QUERY
{
    int cbStruct;            // Sizeof structure in bytes.
    BOOL fUniCodeStrings;    // TRUE if all strings are unicode.
    LPCTSTR pszSearchQuery;  // String containing the search query.
    LONG iProximity;         // Word proximity.
    BOOL fStemmedSearch;     // TRUE for StemmedSearch only.
    BOOL fTitleOnly;         // TRUE for Title search only.
    BOOL fExecute;           // TRUE to initiate the search.
    LPCTSTR pszWindow;       // Window to display in
} HH_FTS_QUERY;

// HH_WINTYPE Structure

typedef struct tagHH_WINTYPE {
    int     cbStruct;        // IN: size of this structure including all Information Types
    BOOL    fUniCodeStrings; // IN/OUT: TRUE if all strings are in UNICODE
    LPCTSTR pszType;         // IN/OUT: Name of a type of window
    DWORD   fsValidMembers;  // IN: Bit flag of valid members (HHWIN_PARAM_)
    DWORD   fsWinProperties; // IN/OUT: Properties/attributes of the window (HHWIN_)

    LPCTSTR pszCaption;      // IN/OUT: Window title
    DWORD   dwStyles;        // IN/OUT: Window styles
    DWORD   dwExStyles;      // IN/OUT: Extended Window styles
    RECT    rcWindowPos;     // IN: Starting position, OUT: current position
    int     nShowState;      // IN: show state (e.g., SW_SHOW)

    HWND  hwndHelp;          // OUT: window handle
    HWND  hwndCaller;        // OUT: who called this window

    HH_INFOTYPE* paInfoTypes;  // IN: Pointer to an array of Information Types

    // The following members are only valid if HHWIN_PROP_TRI_PANE is set

    HWND  hwndToolBar;      // OUT: toolbar window in tri-pane window
    HWND  hwndNavigation;   // OUT: navigation window in tri-pane window
    HWND  hwndHTML;         // OUT: window displaying HTML in tri-pane window
    int   iNavWidth;        // IN/OUT: width of navigation window
    RECT  rcHTML;           // OUT: HTML window coordinates

    LPCTSTR pszToc;         // IN: Location of the table of contents file
    LPCTSTR pszIndex;       // IN: Location of the index file
    LPCTSTR pszFile;        // IN: Default location of the html file
    LPCTSTR pszHome;        // IN/OUT: html file to display when Home button is clicked
    DWORD   fsToolBarFlags; // IN: flags controling the appearance of the toolbar
    BOOL    fNotExpanded;   // IN: TRUE/FALSE to contract or expand, OUT: current state
    int     curNavType;     // IN/OUT: UI to display in the navigational pane
    int     tabpos;         // IN/OUT: HHWIN_NAVTAB_TOP, HHWIN_NAVTAB_LEFT, or HHWIN_NAVTAB_BOTTOM
    int     idNotify;       // IN: ID to use for WM_NOTIFY messages
    BYTE    tabOrder[HH_MAX_TABS + 1];    // IN/OUT: tab order: Contents, Index, Search, History, Favorites, Reserved 1-5, Custom tabs
    int     cHistory;       // IN/OUT: number of history items to keep (default is 30)
    LPCTSTR pszJump1;       // Text for HHWIN_BUTTON_JUMP1
    LPCTSTR pszJump2;       // Text for HHWIN_BUTTON_JUMP2
    LPCTSTR pszUrlJump1;    // URL for HHWIN_BUTTON_JUMP1
    LPCTSTR pszUrlJump2;    // URL for HHWIN_BUTTON_JUMP2
    RECT    rcMinSize;      // Minimum size for window (ignored in version 1)
    int     cbInfoTypes;    // size of paInfoTypes;
    LPCTSTR pszCustomTabs;  // multiple zero-terminated strings
} HH_WINTYPE, *PHH_WINTYPE;

enum {
    HHACT_TAB_CONTENTS,
    HHACT_TAB_INDEX,
    HHACT_TAB_SEARCH,
    HHACT_TAB_HISTORY,
    HHACT_TAB_FAVORITES,

    HHACT_EXPAND,
    HHACT_CONTRACT,
    HHACT_BACK,
    HHACT_FORWARD,
    HHACT_STOP,
    HHACT_REFRESH,
    HHACT_HOME,
    HHACT_SYNC,
    HHACT_OPTIONS,
    HHACT_PRINT,
    HHACT_HIGHLIGHT,
    HHACT_CUSTOMIZE,
    HHACT_JUMP1,
    HHACT_JUMP2,
    HHACT_ZOOM,
    HHACT_TOC_NEXT,
    HHACT_TOC_PREV,
    HHACT_NOTES,

    HHACT_LAST_ENUM,
};

typedef struct tagHHNTRACK
{
    NMHDR   hdr;
    PCSTR   pszCurUrl;      // Multi-byte, null-terminated string
    int     idAction;       // HHACT_ value
    HH_WINTYPE* phhWinType; // Current window type structure
} HHNTRACK;

HWND
WINAPI
HtmlHelpA(
    HWND hwndCaller,
    LPCSTR pszFile,
    UINT uCommand,
    DWORD_PTR dwData
    );

HWND
WINAPI
HtmlHelpW(
    HWND hwndCaller,
    LPCWSTR pszFile,
    UINT uCommand,
    DWORD_PTR dwData
    );
#ifdef UNICODE
#define HtmlHelp  HtmlHelpW
#else
#define HtmlHelp  HtmlHelpA
#endif // !UNICODE

// Use the following for GetProcAddress to load from hhctrl.ocx

#define ATOM_HTMLHELP_API_ANSI    (LPTSTR)((DWORD)((WORD)(14)))
#define ATOM_HTMLHELP_API_UNICODE (LPTSTR)((DWORD)((WORD)(15)))

///////////////////////////////////////////////////////////////////////////////
//
// Global Control Properties. 
//
typedef enum tagHH_GPROPID
{
    HH_GPROPID_SINGLETHREAD=1,      // VARIANT_BOOL: True for single thread
    HH_GPROPID_TOOLBAR_MARGIN=2,    // long: Provides a left/right margin around the toolbar.
    HH_GPROPID_UI_LANGUAGE=3,       // long: LangId of the UI.
    HH_GPROPID_CURRENT_SUBSET=4,    // BSTR: Current subset.
    HH_GPROPID_CONTENT_LANGUAGE=5   // long: LandId for desired content.
} HH_GPROPID;

///////////////////////////////////////////////////////////////////////////////
//
// Global Property structure
//
#ifdef __oaidl_h__

#pragma pack(push, 8)

typedef struct tagHH_GLOBAL_PROPERTY
{
    HH_GPROPID  id;
    VARIANT     var;
} HH_GLOBAL_PROPERTY ;

#pragma pack(pop)
#endif

#ifdef __cplusplus
}
#endif // __cplusplus

#endif // __HTMLHELP_H__