C# WinForms Application Full Integration with HTMLHelp ( .chm ) - Help Topics, Context Sensitive Help, and Tooltips

using System;
using System.Security;
using System.Runtime.InteropServices;
using Microsoft.VisualStudio.OLE.Interop;


namespace WinHelpLib
{

    /// <summary>
    /// ITStorage control data struct
    /// </summary>
    [ComVisible(false), StructLayout(LayoutKind.Sequential)]
    struct ITS_Control_Data
    {
        /// <summary>
        /// Controldata flag
        /// </summary>
        public UInt32 cdwControlData;
        /// <summary>
        /// Controldata flag
        /// </summary>
        public UInt32 adwControlData;
    }

    enum ECompactionLev
    {
        COMPACT_DATA = 0,
        COMPACT_DATA_AND_PATH
    }

    /// <summary>
    /// .NET interface wrapper for InfoTech interface for ITStorage COM object
    /// </summary>
    [ComImport,
    Guid("88CC31DE-27AB-11D0-9DF9-00A0C922E6EC"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown),
    SuppressUnmanagedCodeSecurity]
    interface ITStorage
    {
        [return: MarshalAs(UnmanagedType.Interface)]
        IStorage StgCreateDocfile([In,
                MarshalAs(UnmanagedType.BStr)] string pwcsName,
                int grfMode,
                int reserved);

        [return: MarshalAs(UnmanagedType.Interface)]
        IStorage StgCreateDocfileOnILockBytes(ILockBytes plkbyt,
                                    int grfMode, int reserved);

        int StgIsStorageFile([In,
             MarshalAs(UnmanagedType.BStr)] string pwcsName);
        int StgIsStorageILockBytes(ILockBytes plkbyt);

        [return: MarshalAs(UnmanagedType.Interface)]
        IStorage StgOpenStorage([In,
                    MarshalAs(UnmanagedType.BStr)] string pwcsName,
                    IntPtr pstgPriority,
                    [In, MarshalAs(UnmanagedType.U4)] int grfMode,
                    IntPtr snbExclude,
                    [In, MarshalAs(UnmanagedType.U4)] int reserved);

        [return: MarshalAs(UnmanagedType.Interface)]
        IStorage StgOpenStorageOnILockBytes(ILockBytes plkbyt,
                    IStorage pStgPriority,
                    int grfMode,
                    IntPtr snbExclude,
                    int reserved);

        int StgSetTimes([In, MarshalAs(UnmanagedType.BStr)] string lpszName,
                        Microsoft.VisualStudio.OLE.Interop.FILETIME pctime,
                        Microsoft.VisualStudio.OLE.Interop.FILETIME patime,
                        Microsoft.VisualStudio.OLE.Interop.FILETIME pmtime);
        int SetControlData(ITS_Control_Data pControlData);
        int DefaultControlData(ITS_Control_Data ppControlData);
        int Compact([In, MarshalAs(UnmanagedType.BStr)] string pwcsName,
                         ECompactionLev iLev);
    }


    // Declare ITStorageCoClass as a COM coclass:
    [ComImport, Guid("5d02926a-212e-11d0-9df9-00a0c922e6ec")]
    class ITStorageCoClass   // Cannot have a base class or interface list here.
    {
        // Cannot have any members here 
        // NOTE that the C# compiler will add a default constructor
        // for you (no parameters).
    }

}