// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using Windows.Win32.System.Com;
using Windows.Win32.System.Ole;

namespace Microsoft.Office;

/// <inheritdoc cref="Interface"/>
internal unsafe partial struct IMsoComponentManager : IComIID
{
    // 000C0601-0000-0000-C000-000000000046
    internal static Guid Guid { get; } = new(0x000C0601, 0x0000, 0x0000, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46);

    static ref readonly Guid IComIID.Guid
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        get
        {
            ReadOnlySpan<byte> data =
            [
                0x01, 0x06, 0xc0, 0x00,
                0x00, 0x00,
                0x00, 0x00,
                0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46
            ];

            return ref Unsafe.As<byte, Guid>(ref MemoryMarshal.GetReference(data));
        }
    }

    private readonly void** _lpVtbl;

    /// <inheritdoc cref="IUnknown.QueryInterface(Guid*, void**)"/>
    public HRESULT QueryInterface(Guid* riid, void** ppvObject)
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, Guid*, void**, HRESULT>)_lpVtbl[0])(pThis, riid, ppvObject);
    }

    /// <inheritdoc cref="IUnknown.AddRef"/>
    public uint AddRef()
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, uint>)_lpVtbl[1])(pThis);
    }

    /// <inheritdoc cref="IUnknown.Release"/>
    public uint Release()
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, uint>)_lpVtbl[2])(pThis);
    }

    /// <inheritdoc cref="Interface.QueryService(Guid*, Guid*, void**)"/>
    public HRESULT QueryService(Guid* guidService, Guid* iid, void** ppvObj)
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, Guid*, Guid*, void**, HRESULT>)_lpVtbl[3])
                (pThis, guidService, iid, ppvObj);
    }

    /// <inheritdoc cref="Interface.FDebugMessage(nint, uint, WPARAM, LPARAM)"/>
    public BOOL FDebugMessage(nint dwReserved, uint msg, WPARAM wParam, LPARAM lParam)
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, nint, uint, WPARAM, LPARAM, BOOL>)_lpVtbl[4])
                (pThis, dwReserved, msg, wParam, lParam);
    }

    /// <inheritdoc cref="Interface.FRegisterComponent(IMsoComponent*, MSOCRINFO*, nuint*)"/>
    public BOOL FRegisterComponent(IMsoComponent* piComponent, MSOCRINFO* pcrinfo, nuint* dwComponentID)
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, IMsoComponent*, MSOCRINFO*, nuint*, BOOL>)_lpVtbl[5])
                (pThis, piComponent, pcrinfo, dwComponentID);
    }

    /// <inheritdoc cref="Interface.FRevokeComponent(nuint)"/>
    public BOOL FRevokeComponent(nuint dwComponentID)
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, nuint, BOOL>)_lpVtbl[6])
                (pThis, dwComponentID);
    }

    /// <inheritdoc cref="Interface.FUpdateComponentRegistration(nuint, MSOCRINFO*)"/>
    public BOOL FUpdateComponentRegistration(nuint dwComponentID, MSOCRINFO* pcrinfo)
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, nuint, MSOCRINFO*, BOOL>)_lpVtbl[7])
                (pThis, dwComponentID, pcrinfo);
    }

    /// <inheritdoc cref="Interface.FOnComponentActivate(nuint)"/>
    public BOOL FOnComponentActivate(nuint dwComponentID)
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, nuint, BOOL>)_lpVtbl[8])
                (pThis, dwComponentID);
    }

    /// <inheritdoc cref="Interface.FSetTrackingComponent(nuint, BOOL)"/>
    public BOOL FSetTrackingComponent(nuint dwComponentID, BOOL fTrack)
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, nuint, BOOL, BOOL>)_lpVtbl[9])
                (pThis, dwComponentID, fTrack);
    }

    /// <inheritdoc cref="Interface.OnComponentEnterState(nuint, msocstate, msoccontext, uint, IMsoComponentManager**, uint)"/>
    public void OnComponentEnterState(
        nuint dwComponentID,
        msocstate uStateID,
        msoccontext uContext,
        uint cpicmExclude,
        IMsoComponentManager** rgpicmExclude,
        uint dwReserved)
    {
        fixed (IMsoComponentManager* pThis = &this)
            ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, nuint, msocstate, msoccontext, uint, IMsoComponentManager**, uint, void>)_lpVtbl[10])
                (pThis, dwComponentID, uStateID, uContext, cpicmExclude, rgpicmExclude, dwReserved);
    }

    /// <inheritdoc cref="Interface.FOnComponentExitState(nuint, msocstate, msoccontext, uint, IMsoComponentManager**)"/>
    public BOOL FOnComponentExitState(
        nuint dwComponentID,
        msocstate uStateID,
        msoccontext uContext,
        uint cpicmExclude,
        IMsoComponentManager** rgpicmExclude)
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, nuint, msocstate, msoccontext, uint, IMsoComponentManager**, BOOL>)_lpVtbl[11])
                (pThis, dwComponentID, uStateID, uContext, cpicmExclude, rgpicmExclude);
    }

    /// <inheritdoc cref="Interface.FInState(msocstate, void*)"/>
    public BOOL FInState(msocstate uStateID, void* pvoid)
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, msocstate, void*, BOOL>)_lpVtbl[12])
                (pThis, uStateID, pvoid);
    }

    /// <inheritdoc cref="Interface.FContinueIdle"/>
    public BOOL FContinueIdle()
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, BOOL>)_lpVtbl[13])(pThis);
    }

    /// <inheritdoc cref="Interface.FPushMessageLoop(nuint, msoloop, void*)"/>
    public BOOL FPushMessageLoop(nuint dwComponentID, msoloop uReason, void* pvLoopData)
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, nuint, msoloop, void*, BOOL>)_lpVtbl[14])
                (pThis, dwComponentID, uReason, pvLoopData);
    }

    /// <inheritdoc cref="Interface.FCreateSubComponentManager(IUnknown*, IUnknown*, Guid*, void**)"/>
    public BOOL FCreateSubComponentManager(IUnknown* punkOuter, IUnknown* punkServProv, Guid* riid, void** ppvObj)
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, IUnknown*, IUnknown*, Guid*, void**, BOOL>)_lpVtbl[15])
                (pThis, punkOuter, punkServProv, riid, ppvObj);
    }

    /// <inheritdoc cref="Interface.FGetParentComponentManager(IMsoComponentManager**)"/>
    public BOOL FGetParentComponentManager(IMsoComponentManager** ppicm)
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, IMsoComponentManager**, BOOL>)_lpVtbl[16])
                (pThis, ppicm);
    }

    /// <inheritdoc cref="Interface.FGetActiveComponent(msogac, IMsoComponent**, MSOCRINFO*, uint)"/>
    public BOOL FGetActiveComponent(msogac dwgac, IMsoComponent** ppic, MSOCRINFO* pcrinfo, uint dwReserved)
    {
        fixed (IMsoComponentManager* pThis = &this)
            return ((delegate* unmanaged[Stdcall]<IMsoComponentManager*, msogac, IMsoComponent**, MSOCRINFO*, uint, BOOL>)_lpVtbl[17])
                (pThis, dwgac, ppic, pcrinfo, dwReserved);
    }

    /// <summary>
    ///  Defines a component manager, which is an object that coordinates other components by using its message loop for
    ///  message processing and allocation of idle time.
    /// </summary>
    /// <remarks>
    ///  <para>
    ///   ** Comments on State Contexts **
    ///  </para>
    ///  <para>
    ///   <see cref="FCreateSubComponentManager"/> allows one to create a hierarchical tree of component managers.
    ///   This tree is used to maintain multiple contexts with regard to <see cref="msocstate"/> states. These
    ///   contexts are referred to as 'state contexts'. Each component manager in the tree defines a state context.
    ///   The components registered with a particular component manager or any of its descendents live within that
    ///   component manager's state context.
    ///  </para>
    ///  <para>
    ///   Calls to <see cref="OnComponentEnterState"/> and <see cref="FOnComponentExitState"/> can be used to affect
    ///   all components, only components within the component manager's state context, or only those components
    ///   that are outside of the component manager's state context. <see cref="FInState"/> is used to query the
    ///   state of the component manager's state context at its root.
    ///  </para>
    ///  <para>
    ///   <see href="https://learn.microsoft.com/previous-versions/office/developer/office-2007/ff518963(v=office.12)">
    ///    Microsoft documentation
    ///   </see>
    ///  </para>
    /// </remarks>
    [ComImport]
    [Guid(MsoComponentIds.IID_IMsoComponentManager)]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    internal unsafe interface Interface
    {
        /// <summary>
        ///  Returns in <paramref name="ppvObj"/> an implementation of interface <paramref name="iid"/>
        ///  for service <paramref name="guidService"/> (same as IServiceProvider::QueryService).
        /// </summary>
        /// <param name="ppvObj">The queried interface or null if failed.</param>
        /// <returns>
        ///  NOERROR if the requested service is supported, otherwise appropriate error such
        ///  as E_FAIL, E_NOINTERFACE.
        /// </returns>
        [PreserveSig]
        HRESULT QueryService(
            Guid* guidService,
            Guid* iid,
            void** ppvObj);

        /// <summary>
        ///  Standard <see cref="FDebugMessage"/> method.
        /// </summary>
        /// <remarks>
        ///  <para>
        ///   This method is reserved for internal use and is not intended to be used in your code.
        ///  </para>
        /// </remarks>
        /// <returns><see cref="BOOL.TRUE"/></returns>
        [PreserveSig]
        BOOL FDebugMessage(
            nint dwReserved,
            uint msg,
            WPARAM wParam,
            LPARAM lParam);

        /// <summary>
        ///  Register component <paramref name="piComponent"/> and its registration info
        ///  <paramref name="pcrinfo"/> with this component manager.
        /// </summary>
        /// <param name="dwComponentID">
        ///  Returns a cookie which will identify the component when it calls other
        ///  <see cref="IMsoComponentManager"/> methods.
        /// </param>
        /// <returns><see cref="BOOL.TRUE"/> if successful.</returns>
        [PreserveSig]
        BOOL FRegisterComponent(
            IMsoComponent* piComponent,
            MSOCRINFO* pcrinfo,
            nuint* dwComponentID);

        /// <summary>
        ///  Undo the registration of the component identified by <paramref name="dwComponentID"/>
        ///  (the cookie returned from the <see cref="FRegisterComponent"/> method).
        /// </summary>
        /// <returns><see cref="BOOL.TRUE"/> if successful.</returns>
        [PreserveSig]
        BOOL FRevokeComponent(nuint dwComponentID);

        /// <summary>
        ///  Update the registration info of the component identified by <paramref name="dwComponentID"/>
        ///  (the cookie returned from <see cref="FRegisterComponent"/>) with the new registration
        ///  information <paramref name="pcrinfo"/>.
        /// </summary>
        /// <remarks>
        ///  <para>
        ///   Typically this is used to update the idle time registration data, but it can be used to
        ///   update other registration data as well.
        ///  </para>
        /// </remarks>
        /// <returns><see cref="BOOL.TRUE"/> if successful.</returns>
        [PreserveSig]
        BOOL FUpdateComponentRegistration(
            nuint dwComponentID,
            MSOCRINFO* pcrinfo);

        /// <summary>
        ///  Notify component manager that component identified by <paramref name="dwComponentID"/>
        ///  (cookie returned from <see cref="FRegisterComponent"/>) has been activated.
        /// </summary>
        /// <remarks>
        ///  <para>
        ///   The active component gets the chance to process messages before they are dispatched
        ///   (via <see cref="IMsoComponent.FPreTranslateMessage(MSG*)"/> and typically gets first chance
        ///   at idle time after the host.
        ///  </para>
        ///  <para>
        ///   This method fails if another component is already exclusively active. In this case,
        ///   <see cref="BOOL.FALSE"/> is returned and SetLastError is set to msoerrACompIsXActive
        ///   (comp usually need not take any special action in this case).
        ///  </para>
        /// </remarks>
        /// <returns><see cref="BOOL.TRUE"/> if successful.</returns>
        [PreserveSig]
        BOOL FOnComponentActivate(nuint dwComponentID);

        /// <summary>
        ///  Called to inform component manager that component identified by <paramref name="dwComponentID"/>
        ///  (cookie returned from <see cref="FRegisterComponent"/>) wishes to perform a tracking operation
        ///  (such as mouse tracking).
        /// </summary>
        /// <remarks>
        ///  <para>
        ///   During the tracking operation the component manager routes messages to the tracking component
        ///   (via <see cref="IMsoComponent.FPreTranslateMessage(MSG*)"/>) rather than to the active component.
        ///   When the tracking operation ends, the component manager should resume routing messages to the active
        ///   component.
        ///  </para>
        ///  <para>
        ///   Note: component manager should perform no idle time processing during a tracking operation other
        ///   than give the tracking component idle time via <see cref="IMsoComponent.FDoIdle(msoidlef)"/>.
        ///  </para>
        ///  <para>
        ///   Note: there can only be one tracking component at a time.
        ///  </para>
        /// </remarks>
        /// <param name="fTrack">
        ///  <see cref="BOOL.TRUE"/> to begin tracking operation. <see cref="BOOL.FALSE"/>
        ///  to end the operation.
        /// </param>
        /// <returns><see cref="BOOL.TRUE"/> if successful.</returns>
        [PreserveSig]
        BOOL FSetTrackingComponent(
            nuint dwComponentID,
            BOOL fTrack);

        /// <summary>
        ///  Notify component manager that component identified by <paramref name="dwComponentID"/>
        ///  (cookie returned from <see cref="FRegisterComponent"/>) is entering the state identified
        ///  by <paramref name="uStateID"/>. (For convenience when dealing with sub CompMgrs, the host
        ///  can call this method passing 0 for <paramref name="dwComponentID"/>.
        /// </summary>
        /// <remarks>
        ///  <para>
        ///   Component manager should notify all other interested components within the state context
        ///   indicated by <paramref name="uContext"/>, excluding those within the state context of a
        ///   component manager in <paramref name="rgpicmExclude"/>, via
        ///   <see cref="IMsoComponent.OnEnterState(msocstate, BOOL)"/> (see "Comments on State Contexts" in
        ///   <see cref="IMsoComponentManager"/> remarks).
        ///  </para>
        ///  <para>
        ///   Component Manager should also take appropriate action depending on the value of
        ///   <paramref name="uStateID"/>.
        ///  </para>
        ///  <para>
        ///   Note: Calls to this method are symmetric with calls to <see cref="FOnComponentExitState" />
        ///   That is, if n <see cref="OnComponentEnterState"/> calls are made, the component is
        ///   considered to be in the state until n <see cref="FOnComponentExitState" /> calls are
        ///   made. Before revoking its registration a component must make a sufficient number of
        ///   <see cref="FOnComponentExitState" /> calls to offset any outstanding
        ///   <see cref="OnComponentEnterState"/> calls it has made.
        ///  </para>
        ///  <para>
        ///   Note: in place objects should not call this method with <paramref name="uStateID" />
        ///   of <see cref="msocstate.Modal"/> when entering modal state. Such objects should call
        ///   <see cref="IOleInPlaceFrame.EnableModeless(BOOL)"/> instead.
        ///  </para>
        /// </remarks>
        /// <param name="dwReserved">Reserved for future use. Should be zero.</param>
        /// <param name="cpicmExclude">Count of items in <paramref name="rgpicmExclude"/>.</param>
        /// <param name="rgpicmExclude">
        ///  Can be null. An array of component managers (can include root component manager and/or
        ///  sub component managers). Components within the state context of a component manager
        ///  appearing in this array should NOT be notified of the state change (note: if
        ///  <paramref name="uContext"/> is <see cref="msoccontext.Mine"/>, the only component
        ///  managers in <paramref name="rgpicmExclude"/> that are checked for exclusion are those that
        ///  are sub component managers of this component manager, since all other component
        ///  managers are outside of this component manager's state context anyway.)
        /// </param>
        [PreserveSig]
        void OnComponentEnterState(
            nuint dwComponentID,
            msocstate uStateID,
            msoccontext uContext,
            uint cpicmExclude,
            IMsoComponentManager** rgpicmExclude,
            uint dwReserved);

        /// <summary>
        ///  Notify component manager that component identified by <paramref name="dwComponentID"/>
        ///  (cookie returned from <see cref="FRegisterComponent"/>) is exiting the state identified by
        ///  <paramref name="uStateID"/>. For convenience when dealing with sub component managers, the
        ///  host can call this method passing 0 for <paramref name="dwComponentID"/>.
        /// </summary>
        /// <remarks>
        ///  <para>
        ///   <paramref name="uContext"/>, <paramref name="cpicmExclude"/>, and <paramref name="rgpicmExclude"/>
        ///   are as they are in <see cref="OnComponentEnterState"/>.
        ///  </para>
        ///  <para>
        ///   Component manager should notify all appropriate interested components (taking into account
        ///   <paramref name="uContext"/>, <paramref name="cpicmExclude"/>, <paramref name="rgpicmExclude"/>)
        ///   via <see cref="IMsoComponent.OnEnterState(msocstate, BOOL)"/> (see "Comments on State Contexts", above).
        ///  </para>
        ///  <para>
        ///   Component manager should also take appropriate action depending on the value of <paramref name="uStateID"/>.
        ///  </para>
        ///  <para>
        ///   Note: n calls to this method are symmetric with n calls to <see cref="OnComponentEnterState"/>.
        ///  </para>
        /// </remarks>
        /// <returns>
        ///  <para>
        ///   <see cref="BOOL.TRUE"/> if, at the end of this call, the state is still in effect at the root
        ///   of this component manager's state context (because the host or some other component is still in the state),
        ///   otherwise return <see cref="BOOL.FALSE"/> (ie. return what <see cref="FInState"/> would return).
        ///  </para>
        ///  <para>
        ///   Callers can normally ignore the return value.
        ///  </para>
        /// </returns>
        [PreserveSig]
        BOOL FOnComponentExitState(
            nuint dwComponentID,
            msocstate uStateID,
            msoccontext uContext,
            uint cpicmExclude,
            IMsoComponentManager** rgpicmExclude);

        /// <summary>
        ///  Return <see cref="BOOL.TRUE"/> if the state identified by <paramref name="uStateID"/>
        ///  is in effect at the root of this component manager's state context, <see cref="BOOL.FALSE"/>
        ///  otherwise (see "Comments on State Contexts" in <see cref="IMsoComponentManager"/> remarks).
        /// </summary>
        /// <param name="pvoid">Reserved for future use and should be <see langword="null" />.</param>
        [PreserveSig]
        BOOL FInState(
            msocstate uStateID,
            void* pvoid);

        /// <summary>
        ///  Called periodically by a component during <see cref="IMsoComponent.FDoIdle(msoidlef)"/>.
        /// </summary>
        /// <returns>
        ///  <see cref="BOOL.TRUE"/> if component can continue its idle time processing,
        ///  <see cref="BOOL.FALSE"/> if not (in which case component returns from FDoIdle.)
        /// </returns>
        [PreserveSig]
        BOOL FContinueIdle();

        /// <summary>
        ///  Component identified by <paramref name="dwComponentID"/> (cookie returned from <see cref="FRegisterComponent"/>)
        ///  wishes to push a message loop for reason <paramref name="uReason"/>.
        /// </summary>
        /// <remarks>
        ///  <para>
        ///   The component manager should push its message loop, calling
        ///   <see cref="IMsoComponent.FContinueMessageLoop(msoloop, void*, MSG*)"/> during each loop iteration.
        ///   When <see cref="IMsoComponent.FContinueMessageLoop(msoloop, void*, MSG*)"/> returns <see cref="BOOL.FALSE"/>,
        ///   the component manager terminates the loop.
        ///  </para>
        /// </remarks>
        /// <param name="pvLoopData">Data private to the component.</param>
        /// <returns>
        ///  <see cref="BOOL.TRUE"/> if component manager terminates loop because component told it
        ///  to (by returning <see cref="BOOL.FALSE"/> from <see cref="IMsoComponent.FContinueMessageLoop(msoloop, void*, MSG*)"/>),
        ///  <see cref="BOOL.FALSE"/> if it had to terminate the loop for some other reason. In the
        ///  latter case, component should perform any necessary action (such as cleanup).
        /// </returns>
        [PreserveSig]
        BOOL FPushMessageLoop(
            nuint dwComponentID,
            msoloop uReason,
            void* pvLoopData);

        /// <summary>
        ///  Cause the component manager to create a "sub" component manager, which will be one of its
        ///  children in the hierarchical tree of component managers used to maintain state contexts
        ///  (see "Comments on State Contexts" in <see cref="IMsoComponentManager"/> remarks).
        /// </summary>
        /// <param name="punkOuter">The controlling unknown. Can be null.</param>
        /// <param name="riid">Desired interface identifier (IID).</param>
        /// <param name="ppvObj">The created sub-component manager.</param>
        /// <param name="punkServProv">
        ///  IUnknown object that supports IServiceProvider that the sub component manager should
        ///  delegate <see cref="QueryService" /> calls to. Can be null.
        /// </param>
        /// <returns><see cref="BOOL.TRUE"/> if successful.</returns>
        [PreserveSig]
        BOOL FCreateSubComponentManager(
            IUnknown* punkOuter,
            IUnknown* punkServProv,
            Guid* riid,
            void** ppvObj);

        /// <summary>
        ///  Return in <paramref name="ppicm"/> an AddRef'ed ptr to this component manager's parent
        ///  in the hierarchical tree of component managers used to maintain state contexts (see
        ///  "Comments on State Contexts" in <see cref="IMsoComponentManager"/> remarks).
        /// </summary>
        /// <returns>
        ///  <see cref="BOOL.TRUE"/> if the parent is returned, <see cref="BOOL.FALSE"/>
        ///  if no parent exists or some error occurred.
        /// </returns>
        [PreserveSig]
        BOOL FGetParentComponentManager(
            IMsoComponentManager** ppicm);

        /// <summary>
        ///  Return in <paramref name="ppic"/> an AddRef'ed ptr to the current active
        ///  or tracking component (as indicated by <paramref name="dwgac"/>, and its
        ///  registration information in <paramref name="pcrinfo"/>.
        /// </summary>
        /// <remarks>
        ///  <para>
        ///   <paramref name="ppic"/> and/or <paramref name="pcrinfo"/> can be NULL if caller is not interested these values.
        ///   If <paramref name="pcrinfo"/> is not <see langword="null" /> caller should set <see cref="MSOCRINFO.cbSize"/>
        ///   before calling this method.
        ///  </para>
        /// </remarks>
        /// <param name="dwReserved">Reserved for future use and should be zero.</param>
        /// <returns>
        ///  <see cref="BOOL.TRUE"/> if the component indicated by <paramref name="dwgac"/>
        ///  exists, <see cref="BOOL.FALSE"/> if no such component exists or some error occurred.
        /// </returns>
        [PreserveSig]
        BOOL FGetActiveComponent(
            msogac dwgac,
            IMsoComponent** ppic,
            MSOCRINFO* pcrinfo,
            uint dwReserved);
    }
}
