如何使用MarshalAs Unmanaged

 UnmanagedType 枚举

[ComVisibleAttribute(true)]
public enum UnmanagedType

using System;

using System.Runtime.InteropServices;

using System.Reflection;

public class HHInterop

{

   // Constants

   const int HH_MAX_TABS = 19; // maximum number of tabs

   // commands

   protected const int HH_DISPLAY_TOPIC      = 0x0000;

   protected const int HH_SET_WIN_TYPE       = 0x0004;  // [Use HtmlHelp_SetWinType()]

   protected const int HH_GET_WIN_TYPE       = 0x0005;  //

   // parameter info used with HH_WINTYPE struct

   public const int HHWIN_PARAM_PROPERTIES      = (1 << 1);    // valid fsWinProperties

   public const int HHWIN_PARAM_STYLES          = (1 << 2);    // valid dwStyles

   public const int HHWIN_PARAM_EXSTYLES        = (1 << 3);    // valid dwExStyles

   public const int HHWIN_PARAM_RECT            = (1 << 4);    // valid rcWindowPos

   public const int HHWIN_PARAM_NAV_WIDTH       = (1 << 5);    // valid iNavWidth

   public const int HHWIN_PARAM_SHOWSTATE       = (1 << 6);    // valid nShowState

   public const int HHWIN_PARAM_INFOTYPES       = (1 << 7);    // valid apInfoTypes

   public const int HHWIN_PARAM_TB_FLAGS        = (1 << 8);    // valid fsToolBarFlags

   public const int HHWIN_PARAM_EXPANSION       = (1 << 9);    // valid fNotExpanded

   public const int HHWIN_PARAM_TABPOS          = (1 << 10);   // valid tabpos

   public const int HHWIN_PARAM_TABORDER        = (1 << 11);   // valid taborder

   public const int HHWIN_PARAM_HISTORY_COUNT   = (1 << 12);   // valid cHistory

   public const int HHWIN_PARAM_CUR_TAB         = (1 << 13);   // valid curNavType

   // property values used with HH_WINTYPE struct

   public const int HHWIN_PROP_TAB_AUTOHIDESHOW = (1 << 0);    // Automatically hide/show tri-pane window

   public const int HHWIN_PROP_ONTOP            = (1 << 1);    // Topmost window

   public const int HHWIN_PROP_NOTITLEBAR       = (1 << 2);    // no title bar

   public const int HHWIN_PROP_NODEF_STYLES     = (1 << 3);    // no default window styles (only HH_WINTYPE.dwStyles)

   public const int HHWIN_PROP_NODEF_EXSTYLES   = (1 << 4);    // no default extended window styles (only HH_WINTYPE.dwExStyles)

   public const int HHWIN_PROP_TRI_PANE         = (1 << 5);    // use a tri-pane window

   public const int HHWIN_PROP_NOTB_TEXT        = (1 << 6);    // no text on toolbar buttons

   public const int HHWIN_PROP_POST_QUIT        = (1 << 7);    // post WM_QUIT message when window closes

   public const int HHWIN_PROP_AUTO_SYNC        = (1 << 8);    // automatically ssync contents and index

   public const int HHWIN_PROP_TRACKING         = (1 << 9);    // send tracking notification messages

   public const int HHWIN_PROP_TAB_SEARCH       = (1 << 10);   // include search tab in navigation pane

   public const int HHWIN_PROP_TAB_HISTORY      = (1 << 11);   // include history tab in navigation pane

   public const int HHWIN_PROP_TAB_FAVORITES    = (1 << 12);   // include favorites tab in navigation pane

   public const int HHWIN_PROP_CHANGE_TITLE     = (1 << 13);   // Put current HTML title in title bar

   public const int HHWIN_PROP_NAV_ONLY_WIN     = (1 << 14);   // Only display the navigation window

   public const int HHWIN_PROP_NO_TOOLBAR       = (1 << 15);   // Don’t display a toolbar

   public const int HHWIN_PROP_MENU             = (1 << 16);   // Menu

   public const int HHWIN_PROP_TAB_ADVSEARCH    = (1 << 17);   // Advanced FTS UI.

   public const int HHWIN_PROP_USER_POS         = (1 << 18);   // After initial creation, user controls window size/position

   public const int HHWIN_PROP_TAB_CUSTOM1      = (1 << 19);   // Use custom tab #1

   public const int HHWIN_PROP_TAB_CUSTOM2      = (1 << 20);   // Use custom tab #2

   public const int HHWIN_PROP_TAB_CUSTOM3      = (1 << 21);   // Use custom tab #3

   public const int HHWIN_PROP_TAB_CUSTOM4      = (1 << 22);   // Use custom tab #4

   public const int HHWIN_PROP_TAB_CUSTOM5      = (1 << 23);   // Use custom tab #5

   public const int HHWIN_PROP_TAB_CUSTOM6      = (1 << 24);   // Use custom tab #6

   public const int HHWIN_PROP_TAB_CUSTOM7      = (1 << 25);   // Use custom tab #7

   public const int HHWIN_PROP_TAB_CUSTOM8      = (1 << 26);   // Use custom tab #8

   public const int HHWIN_PROP_TAB_CUSTOM9      = (1 << 27);   // Use custom tab #9

   public const int HHWIN_TB_MARGIN             = (1 << 28);   // the window type has a margin

   public const int HHWIN_BUTTON_EXPAND         = (1 << 1);    // Expand/contract button

   public const int HHWIN_BUTTON_BACK           = (1 << 2);    // Back button

   public const int HHWIN_BUTTON_FORWARD        = (1 << 3);    // Forward button

   public const int HHWIN_BUTTON_STOP           = (1 << 4);    // Stop button

   public const int HHWIN_BUTTON_REFRESH        = (1 << 5);    // Refresh button

   public const int HHWIN_BUTTON_HOME           = (1 << 6);    // Home button

   public const int HHWIN_BUTTON_SYNC           = (1 << 11);   // Sync button

   public const int HHWIN_BUTTON_OPTIONS        = (1 << 12);   // Options button

   public const int HHWIN_BUTTON_PRINT          = (1 << 13);   // Print button

   public const int HHWIN_BUTTON_JUMP1          = (1 << 18);

   public const int HHWIN_BUTTON_JUMP2          = (1 << 19);

   public const int HHWIN_BUTTON_ZOOM           = (1 << 20);

   public const int HHWIN_BUTTON_TOC_NEXT       = (1 << 21);

   public const int HHWIN_BUTTON_TOC_PREV       = (1 << 22);

   public const int HHWIN_DEF_BUTTONS = HHWIN_BUTTON_EXPAND | HHWIN_BUTTON_BACK |

      HHWIN_BUTTON_OPTIONS | HHWIN_BUTTON_PRINT;

   // Structures

   [StructLayout(LayoutKind.Sequential)]

   public struct Point

   {

      public int x;

      public int y;

   };  

   [StructLayout(LayoutKind.Sequential)]

   public struct Rect

   {

      public int left;

      public int top;

      public int right;

      public int bottom;

   };  

   [StructLayout(LayoutKind.Sequential)]

   public struct HH_WINTYPE

   {

      public int     cbStruct;        // IN: size of this structure including all Information Types

      [MarshalAs(UnmanagedType.Bool)]

      public bool   fUniCodeStrings; // IN/OUT: TRUE if all strings are in Unicode

      [MarshalAs(UnmanagedType.LPStr)]

      public String pszType;         // IN/OUT: Name of a type of window

      public uint   fsValidMembers;  // IN: Bit flag of valid members (HHWIN_PARAM_)

      public uint   fsWinProperties; // IN/OUT: Properties/attributes of the window (HHWIN_)

      [MarshalAs(UnmanagedType.LPStr)]

      public String pszCaption;      // IN/OUT: Window title

      public uint   dwStyles;        // IN/OUT: Window styles

      public uint   dwExStyles;      // IN/OUT: Extended Window styles

      public Rect    rcWindowPos;     // IN: Starting position, OUT: current position

      public int     nShowState;      // IN: show state (for example, SW_SHOW)

      public int  hwndHelp;          // OUT: window handle

      public int  hwndCaller;        // OUT: who called this window

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

      public int  paInfoTypes; // WARNING: this array is not marshalled!

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

      public int  hwndToolBar;      // OUT: toolbar window in tri-pane window

      public int  hwndNavigation;   // OUT: navigation window in tri-pane window

      public int  hwndHTML;         // OUT: window displaying HTML in tri-pane window

      public int   iNavWidth;        // IN/OUT: width of navigation window

      public Rect  rcHTML;           // OUT: HTML window coordinates

      [MarshalAs(UnmanagedType.LPStr)]

      public String pszToc;         // IN: Location of the table of contents file

      [MarshalAs(UnmanagedType.LPStr)]

      public String pszIndex;       // IN: Location of the index file

      [MarshalAs(UnmanagedType.LPStr)]

      public String pszFile;        // IN: Default location of the html file

      [MarshalAs(UnmanagedType.LPStr)]

      public String pszHome;        // IN/OUT: html file to display when Home button is clicked

      public uint   fsToolBarFlags; // IN: flags controlling the appearance of the toolbar

      [MarshalAs(UnmanagedType.Bool)]

      public bool    fNotExpanded;   // IN: TRUE/FALSE to contract or expand, OUT: current state

      public int     curNavType;     // IN/OUT: UI to display in the navigational pane

      public int     tabpos;         // IN/OUT: HHWIN_NAVTAB_TOP, HHWIN_NAVTAB_LEFT, or HHWIN_NAVTAB_BOTTOM

      public int     idNotify;       // IN: ID to use for WM_NOTIFY messages

      [MarshalAs(UnmanagedType.ByValArray, SizeConst= HH_MAX_TABS + 1, ArraySubType = UnmanagedType.U1)]

      public byte    [] tabOrder;    // IN/OUT: tab order: Contents, Index, Search, History, Favorites, Reserved 1-5, Custom tabs

      public int     cHistory;       // IN/OUT: number of history items to keep (default is 30)

      [MarshalAs(UnmanagedType.LPStr)]

      public String pszJump1;       // Text for HHWIN_BUTTON_JUMP1

      [MarshalAs(UnmanagedType.LPStr)]

      public String pszJump2;       // Text for HHWIN_BUTTON_JUMP2

      [MarshalAs(UnmanagedType.LPStr)]

      public String pszUrlJump1;    // URL for HHWIN_BUTTON_JUMP1

      [MarshalAs(UnmanagedType.LPStr)]

      public String pszUrlJump2;    // URL for HHWIN_BUTTON_JUMP2

      public Rect    rcMinSize;      // Minimum size for window (ignored in version 1)

      public int     cbInfoTypes;    // size of paInfoTypes;

      // WARNING: this undocumented field is not marshalled

      public int pszCustomTabs;  // multiple zero-terminated strings

   };

       

   // Function calls

   // internal interop helpers

   public static int HtmlHelp_DisplayTopic(

      int caller,

      String file)

   {

      return HtmlHelp(caller, file, HH_DISPLAY_TOPIC, 0);

   }

   // This helper is for getting a ptr to an HH_WINTYPE struct OUT as the dwData parameter. This is

   // used with the HH_GET_WIN_TYPE command.

   [DllImport("hhctrl.ocx", CharSet=CharSet.Unicode, EntryPoint="HtmlHelpW")]

   protected static extern int HtmlHelp_IntPtr_Helper(

      int caller,

      String file,

      uint command,

      ref IntPtr ps

      );

   // This overload is for performing the HH_SET_WIN_TYPE command, which passes an

   // HH_WINTYPE value IN as the dwData parameter.

   [DllImport("hhctrl.ocx", CharSet=CharSet.Unicode, EntryPoint="HtmlHelpW")]

   protected static extern int HtmlHelp_SetWinType_Helper(

      int caller,

      String file,

      uint command,

      ref HH_WINTYPE wintype

      );

   // This overload is for passing a single uint value as the dwData parameter.

   [DllImport("hhctrl.ocx", CharSet=CharSet.Unicode, EntryPoint="HtmlHelpW")]

   protected static extern int HtmlHelp(

      int caller,

      String file,

      uint command,

      uint data

      );

   // This overload is for passing a string as the dwData parameter (for example, for the HH_DISPLAY_INDEX command)

   [DllImport("hhctrl.ocx", CharSet=CharSet.Unicode, EntryPoint="HtmlHelpW")]

   protected static extern int HtmlHelp(

      int caller,

      String file,

      uint command,

      String str

      );

      

   // public entrypoints

   // This overload is for performing the HH_SET_WIN_TYPE command, which passes an

   // HH_WINTYPE value IN as the dwData parameter.

   public static int HtmlHelp_SetWinType(

      int caller,

      String file,

      ref HH_WINTYPE wintype

      )

   {

      wintype.cbStruct = Marshal.SizeOf(wintype);

      wintype.fUniCodeStrings = false; // NOTE: this should be set to zero for proper 2-way marshalling

      return HtmlHelp_SetWinType_Helper(

         caller,

         file,

         HH_SET_WIN_TYPE,

         ref wintype);

   }

   public static int HtmlHelp_GetWinType(

      int caller,

      String file,

      ref HH_WINTYPE wintype)

   {

      IntPtr pwt = new IntPtr(0);

      int retval = HtmlHelp_IntPtr_Helper(

         caller,

         file,

         HH_GET_WIN_TYPE,

         ref pwt);

      // otherwise, let’s try to marshal it

      wintype = (HH_WINTYPE)Marshal.PtrToStructure(pwt, typeof(HH_WINTYPE));

      return retval;

   }

}