#region Copyright (c) 2022-2023 Technosoftware GmbH. All rights reserved
//-----------------------------------------------------------------------------
// Copyright (c) 2022-2023 Technosoftware GmbH. All rights reserved
// Web: https://technosoftware.com 
//
// The Software is based on the OPC Foundation MIT License. 
// The complete license agreement for that can be found here:
// http://opcfoundation.org/License/MIT/1.00/
//-----------------------------------------------------------------------------
#endregion Copyright (c) 2011-2023 Technosoftware GmbH. All rights reserved

#region Using Directives
using System;
using System.Runtime.InteropServices;
#endregion

#pragma warning disable 1591

namespace Technosoftware.OpcRcw.Ae
{
    /// <exclude />
	[ComImport]
    [GuidAttribute("58E13251-AC87-11d1-84D5-00608CB8A7E9")]
    [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
    public interface CATID_OPCAEServer10 { }

    /// <exclude />
    public enum OPCAEBROWSEDIRECTION
    {
        OPCAE_BROWSE_UP = 1,
        OPCAE_BROWSE_DOWN,
        OPCAE_BROWSE_TO
    }

    /// <exclude />
    public enum OPCAEBROWSETYPE
    {
        OPC_AREA = 1,
        OPC_SOURCE
    }

    /// <exclude />
    public enum OPCEVENTSERVERSTATE
    {
        OPCAE_STATUS_RUNNING = 1,
        OPCAE_STATUS_FAILED,
        OPCAE_STATUS_NOCONFIG,
        OPCAE_STATUS_SUSPENDED,
        OPCAE_STATUS_TEST,
        OPCAE_STATUS_COMM_FAULT
    }

    /// <exclude />
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct FILETIME
    {
        public int dwLowDateTime;
        public int dwHighDateTime;
    }

    /// <exclude />
	[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct ONEVENTSTRUCT
    {
        [MarshalAs(UnmanagedType.I2)]
        public short wChangeMask;
        [MarshalAs(UnmanagedType.I2)]
        public short wNewState;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string szSource;
        public FILETIME ftTime;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string szMessage;
        [MarshalAs(UnmanagedType.I4)]
        public int dwEventType;
        [MarshalAs(UnmanagedType.I4)]
        public int dwEventCategory;
        [MarshalAs(UnmanagedType.I4)]
        public int dwSeverity;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string szConditionName;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string szSubconditionName;
        [MarshalAs(UnmanagedType.I2)]
        public short wQuality;
        [MarshalAs(UnmanagedType.I2)]
        public short wReserved;
        [MarshalAs(UnmanagedType.I4)]
        public int bAckRequired;
        public FILETIME ftActiveTime;
        [MarshalAs(UnmanagedType.I4)]
        public int dwCookie;
        [MarshalAs(UnmanagedType.I4)]
        public int dwNumEventAttrs;
        public IntPtr pEventAttributes;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string szActorID;
    }

    /// <exclude />
	[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct OPCEVENTSERVERSTATUS
    {
        public FILETIME ftStartTime;
        public FILETIME ftCurrentTime;
        public FILETIME ftLastUpdateTime;
        public OPCEVENTSERVERSTATE dwServerState;
        [MarshalAs(UnmanagedType.I2)]
        public short wMajorVersion;
        [MarshalAs(UnmanagedType.I2)]
        public short wMinorVersion;
        [MarshalAs(UnmanagedType.I2)]
        public short wBuildNumber;
        [MarshalAs(UnmanagedType.I2)]
        public short wReserved;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string szVendorInfo;
    }

    /// <exclude />
	[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct OPCCONDITIONSTATE
    {
        [MarshalAs(UnmanagedType.I2)]
        public short wState;
        [MarshalAs(UnmanagedType.I2)]
        public short wReserved1;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string szActiveSubCondition;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string szASCDefinition;
        [MarshalAs(UnmanagedType.I4)]
        public int dwASCSeverity;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string szASCDescription;
        [MarshalAs(UnmanagedType.I2)]
        public short wQuality;
        [MarshalAs(UnmanagedType.I2)]
        public short wReserved2;
        public FILETIME ftLastAckTime;
        public FILETIME ftSubCondLastActive;
        public FILETIME ftCondLastActive;
        public FILETIME ftCondLastInactive;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string szAcknowledgerID;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string szComment;
        [MarshalAs(UnmanagedType.I4)]
        public int dwNumSCs;
        public IntPtr pszSCNames;
        public IntPtr pszSCDefinitions;
        public IntPtr pdwSCSeverities;
        public IntPtr pszSCDescriptions;
        public int dwNumEventAttrs;
        public IntPtr pEventAttributes;
        public IntPtr pErrors;
    }

    /// <exclude />
	[ComImport]
    [GuidAttribute("65168851-5783-11D1-84A0-00608CB8A7E9")]
    [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IOPCEventServer
    {
        void GetStatus(
            out IntPtr ppEventServerStatus);

        void CreateEventSubscription(
            [MarshalAs(UnmanagedType.I4)]
            int bActive,
            [MarshalAs(UnmanagedType.I4)]
            int dwBufferTime,
            [MarshalAs(UnmanagedType.I4)]
            int dwMaxSize,
            [MarshalAs(UnmanagedType.I4)]
            int hClientSubscription,
            ref Guid riid,
            [Out][MarshalAs(UnmanagedType.IUnknown, IidParameterIndex=4)]
            out object ppUnk,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwRevisedBufferTime,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwRevisedMaxSize);

        void QueryAvailableFilters(
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwFilterMask);

        void QueryEventCategories(
            [MarshalAs(UnmanagedType.I4)]
            int dwEventType,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwCount,
            [Out]
            out IntPtr ppdwEventCategories,
            [Out]
            out IntPtr ppszEventCategoryDescs);

        [PreserveSig]
        int QueryConditionNames(
            [MarshalAs(UnmanagedType.I4)]
            int dwEventCategory,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwCount,
            [Out]
            out IntPtr ppszConditionNames);

        void QuerySubConditionNames(
            [MarshalAs(UnmanagedType.LPWStr)]
            string szConditionName,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwCount,
            [Out]
            out IntPtr ppszSubConditionNames);

        void QuerySourceConditions(
            [MarshalAs(UnmanagedType.LPWStr)]
            string szSource,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwCount,
            [Out]
            out IntPtr ppszConditionNames);

        void QueryEventAttributes(
            [MarshalAs(UnmanagedType.I4)]
            int dwEventCategory,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwCount,
            [Out]
            out IntPtr ppdwAttrIDs,
            [Out]
            out IntPtr ppszAttrDescs,
            [Out]
            out IntPtr ppvtAttrTypes);

        void TranslateToItemIDs(
            [MarshalAs(UnmanagedType.LPWStr)]
            string szSource,
            [MarshalAs(UnmanagedType.I4)]
            int dwEventCategory,
            [MarshalAs(UnmanagedType.LPWStr)]
            string szConditionName,
            [MarshalAs(UnmanagedType.LPWStr)]
            string szSubconditionName,
            [MarshalAs(UnmanagedType.I4)]
            int dwCount,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.I4, SizeParamIndex=4)]
            int[] pdwAssocAttrIDs,
            out IntPtr ppszAttrItemIDs,
            out IntPtr ppszNodeNames,
            out IntPtr ppCLSIDs);

        void GetConditionState(
            [MarshalAs(UnmanagedType.LPWStr)]
            string szSource,
            [MarshalAs(UnmanagedType.LPWStr)]
            string szConditionName,
            [MarshalAs(UnmanagedType.I4)]
            int dwNumEventAttrs,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.I4, SizeParamIndex=2)]
            int[] pdwAttributeIDs,
            [Out]
            out IntPtr ppConditionState);

        void EnableConditionByArea(
            [MarshalAs(UnmanagedType.I4)]
            int dwNumAreas,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] pszAreas);

        void EnableConditionBySource(
            [MarshalAs(UnmanagedType.I4)]
            int dwNumSources,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] pszSources);

        void DisableConditionByArea(
            [MarshalAs(UnmanagedType.I4)]
            int dwNumAreas,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] pszAreas);

        void DisableConditionBySource(
            [MarshalAs(UnmanagedType.I4)]
            int dwNumSources,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] pszSources);

        void AckCondition(
            [MarshalAs(UnmanagedType.I4)]
            int dwCount,
            [MarshalAs(UnmanagedType.LPWStr)]
            string szAcknowledgerID,
            [MarshalAs(UnmanagedType.LPWStr)]
            string szComment,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] pszSource,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] szConditionName,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPStruct, SizeParamIndex=0)]
            FILETIME[] pftActiveTime,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.I4, SizeParamIndex=0)]
            int[] pdwCookie,
            [Out]
            out IntPtr ppErrors);

        void CreateAreaBrowser(
            ref Guid riid,
            [Out][MarshalAs(UnmanagedType.IUnknown, IidParameterIndex=0)]
            out object ppUnk);
    }

    /// <exclude />
	[ComImport]
    [GuidAttribute("65168855-5783-11D1-84A0-00608CB8A7E9")]
    [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IOPCEventSubscriptionMgt
    {
        void SetFilter(
            [MarshalAs(UnmanagedType.I4)]
            int dwEventType,
            [MarshalAs(UnmanagedType.I4)]
            int dwNumCategories,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.I4, SizeParamIndex=1)]
            int[] pdwEventCategories,
            [MarshalAs(UnmanagedType.I4)]
            int dwLowSeverity,
            [MarshalAs(UnmanagedType.I4)]
            int dwHighSeverity,
            [MarshalAs(UnmanagedType.I4)]
            int dwNumAreas,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=5)]
            string[] pszAreaList,
            [MarshalAs(UnmanagedType.I4)]
            int dwNumSources,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=7)]
            string[] pszSourceList);

        void GetFilter(
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwEventType,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwNumCategories,
            [Out]
            out IntPtr ppdwEventCategories,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwLowSeverity,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwHighSeverity,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwNumAreas,
            [Out]
            out IntPtr ppszAreaList,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwNumSources,
            [Out]
            out IntPtr ppszSourceList);

        void SelectReturnedAttributes(
            [MarshalAs(UnmanagedType.I4)]
            int dwEventCategory,
            [MarshalAs(UnmanagedType.I4)]
            int dwCount,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.I4, SizeParamIndex=1)]
            int[] dwAttributeIDs);

        void GetReturnedAttributes(
            [MarshalAs(UnmanagedType.I4)]
            int dwEventCategory,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwCount,
            [Out]
            out IntPtr ppdwAttributeIDs);

        void Refresh(
            [MarshalAs(UnmanagedType.I4)]
            int dwConnection);

        void CancelRefresh(
            [MarshalAs(UnmanagedType.I4)]
            int dwConnection);

        void GetState(
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pbActive,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwBufferTime,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwMaxSize,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int phClientSubscription);

        void SetState(
            IntPtr pbActive,
            IntPtr pdwBufferTime,
            IntPtr pdwMaxSize,
            [MarshalAs(UnmanagedType.I4)]
            int hClientSubscription,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwRevisedBufferTime,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwRevisedMaxSize);
    }

    /// <exclude />
	[ComImport]
    [GuidAttribute("65168857-5783-11D1-84A0-00608CB8A7E9")]
    [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IOPCEventAreaBrowser
    {
        void ChangeBrowsePosition(
            OPCAEBROWSEDIRECTION dwBrowseDirection,
            [MarshalAs(UnmanagedType.LPWStr)]
            string szString);

        void BrowseOPCAreas(
            OPCAEBROWSETYPE dwBrowseFilterType,
            [MarshalAs(UnmanagedType.LPWStr)]
            string szFilterCriteria,
            [Out]
            out OpcRcw.Comn.IEnumString ppIEnumString);

        void GetQualifiedAreaName(
            [MarshalAs(UnmanagedType.LPWStr)]
            string szAreaName,
            [Out][MarshalAs(UnmanagedType.LPWStr)]
            out string pszQualifiedAreaName);

        void GetQualifiedSourceName(
            [MarshalAs(UnmanagedType.LPWStr)]
            string szSourceName,
            [Out][MarshalAs(UnmanagedType.LPWStr)]
            out string pszQualifiedSourceName);
    }

    /// <exclude />
	[ComImport]
    [GuidAttribute("6516885F-5783-11D1-84A0-00608CB8A7E9")]
    [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IOPCEventSink
    {
        void OnEvent(
            [MarshalAs(UnmanagedType.I4)]
            int hClientSubscription,
            [MarshalAs(UnmanagedType.I4)]
            int bRefresh,
            [MarshalAs(UnmanagedType.I4)]
            int bLastRefresh,
            [MarshalAs(UnmanagedType.I4)]
            int dwCount,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPStruct, SizeParamIndex=3)]
            ONEVENTSTRUCT[] pEvents);
    }

    /// <exclude />
	[ComImport]
    [GuidAttribute("71BBE88E-9564-4bcd-BCFC-71C558D94F2D")]
    [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IOPCEventServer2 // : IOPCEventServer
    {
        void GetStatus(
            out IntPtr ppEventServerStatus);

        void CreateEventSubscription(
            [MarshalAs(UnmanagedType.I4)]
            int bActive,
            [MarshalAs(UnmanagedType.I4)]
            int dwBufferTime,
            [MarshalAs(UnmanagedType.I4)]
            int dwMaxSize,
            [MarshalAs(UnmanagedType.I4)]
            int hClientSubscription,
            ref Guid riid,
            [Out][MarshalAs(UnmanagedType.IUnknown, IidParameterIndex=4)]
            out object ppUnk,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwRevisedBufferTime,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwRevisedMaxSize);

        void QueryAvailableFilters(
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwFilterMask);

        void QueryEventCategories(
            [MarshalAs(UnmanagedType.I4)]
            int dwEventType,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwCount,
            [Out]
            out IntPtr ppdwEventCategories,
            [Out]
            out IntPtr ppszEventCategoryDescs);

        [PreserveSig]
        int QueryConditionNames(
            [MarshalAs(UnmanagedType.I4)]
            int dwEventCategory,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwCount,
            [Out]
            out IntPtr ppszConditionNames);

        void QuerySubConditionNames(
            [MarshalAs(UnmanagedType.LPWStr)]
            string szConditionName,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwCount,
            [Out]
            out IntPtr ppszSubConditionNames);

        void QuerySourceConditions(
            [MarshalAs(UnmanagedType.LPWStr)]
            string szSource,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwCount,
            [Out]
            out IntPtr ppszConditionNames);

        void QueryEventAttributes(
            [MarshalAs(UnmanagedType.I4)]
            int dwEventCategory,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwCount,
            [Out]
            out IntPtr ppdwAttrIDs,
            [Out]
            out IntPtr ppszAttrDescs,
            [Out]
            out IntPtr ppvtAttrTypes);

        void TranslateToItemIDs(
            [MarshalAs(UnmanagedType.LPWStr)]
            string szSource,
            [MarshalAs(UnmanagedType.I4)]
            int dwEventCategory,
            [MarshalAs(UnmanagedType.LPWStr)]
            string szConditionName,
            [MarshalAs(UnmanagedType.LPWStr)]
            string szSubconditionName,
            [MarshalAs(UnmanagedType.I4)]
            int dwCount,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.I4, SizeParamIndex=4)]
            int[] pdwAssocAttrIDs,
            out IntPtr ppszAttrItemIDs,
            out IntPtr ppszNodeNames,
            out IntPtr ppCLSIDs);

        void GetConditionState(
            [MarshalAs(UnmanagedType.LPWStr)]
            string szSource,
            [MarshalAs(UnmanagedType.LPWStr)]
            string szConditionName,
            [MarshalAs(UnmanagedType.I4)]
            int dwNumEventAttrs,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.I4, SizeParamIndex=2)]
            int[] pdwAttributeIDs,
            [Out]
            out IntPtr ppConditionState);

        void EnableConditionByArea(
            [MarshalAs(UnmanagedType.I4)]
            int dwNumAreas,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] pszAreas);

        void EnableConditionBySource(
            [MarshalAs(UnmanagedType.I4)]
            int dwNumSources,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] pszSources);

        void DisableConditionByArea(
            [MarshalAs(UnmanagedType.I4)]
            int dwNumAreas,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] pszAreas);

        void DisableConditionBySource(
            [MarshalAs(UnmanagedType.I4)]
            int dwNumSources,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] pszSources);

        void AckCondition(
            [MarshalAs(UnmanagedType.I4)]
            int dwCount,
            [MarshalAs(UnmanagedType.LPWStr)]
            string szAcknowledgerID,
            [MarshalAs(UnmanagedType.LPWStr)]
            string szComment,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] pszSource,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] szConditionName,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPStruct, SizeParamIndex=0)]
            FILETIME[] pftActiveTime,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.I4, SizeParamIndex=0)]
            int[] pdwCookie,
            [Out]
            out IntPtr ppErrors);

        void CreateAreaBrowser(
            ref Guid riid,
            [Out][MarshalAs(UnmanagedType.IUnknown, IidParameterIndex=0)]
            out object ppUnk);

        void EnableConditionByArea2(
            [MarshalAs(UnmanagedType.I4)]
            int dwNumAreas,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] pszAreas,
            [Out]
            out IntPtr ppErrors);

        void EnableConditionBySource2(
            [MarshalAs(UnmanagedType.I4)]
            int dwNumSources,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] pszSources,
            [Out]
            out IntPtr ppErrors);

        void DisableConditionByArea2(
            [MarshalAs(UnmanagedType.I4)]
            int dwNumAreas,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] pszAreas,
            [Out]
            out IntPtr ppErrors);

        void DisableConditionBySource2(
            [MarshalAs(UnmanagedType.I4)]
            int dwNumSources,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] pszSources,
            [Out]
            out IntPtr ppErrors);

        void GetEnableStateByArea(
            [MarshalAs(UnmanagedType.I4)]
            int dwNumAreas,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] pszAreas,
            [Out]
            out IntPtr pbEnabled,
            [Out]
            out IntPtr pbEffectivelyEnabled,
            [Out]
            out IntPtr ppErrors);

        void GetEnableStateBySource(
            [MarshalAs(UnmanagedType.I4)]
            int dwNumSources,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=0)]
            string[] pszSources,
            out IntPtr pbEnabled,
            out IntPtr pbEffectivelyEnabled,
            out IntPtr ppErrors);
    };

    /// <exclude />
	[ComImport]
    [GuidAttribute("94C955DC-3684-4ccb-AFAB-F898CE19AAC3")]
    [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IOPCEventSubscriptionMgt2 // : IOPCEventSubscriptionMgt
    {
        void SetFilter(
            [MarshalAs(UnmanagedType.I4)]
            int dwEventType,
            [MarshalAs(UnmanagedType.I4)]
            int dwNumCategories,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.I4, SizeParamIndex=1)]
            int[] pdwEventCategories,
            [MarshalAs(UnmanagedType.I4)]
            int dwLowSeverity,
            [MarshalAs(UnmanagedType.I4)]
            int dwHighSeverity,
            [MarshalAs(UnmanagedType.I4)]
            int dwNumAreas,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=5)]
            string[] pszAreaList,
            [MarshalAs(UnmanagedType.I4)]
            int dwNumSources,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr, SizeParamIndex=7)]
            string[] pszSourceList);

        void GetFilter(
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwEventType,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwNumCategories,
            [Out]
            out IntPtr ppdwEventCategories,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwLowSeverity,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwHighSeverity,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwNumAreas,
            [Out]
            out IntPtr ppszAreaList,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwNumSources,
            [Out]
            out IntPtr ppszSourceList);

        void SelectReturnedAttributes(
            [MarshalAs(UnmanagedType.I4)]
            int dwEventCategory,
            [MarshalAs(UnmanagedType.I4)]
            int dwCount,
            [MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.I4, SizeParamIndex=1)]
            int[] dwAttributeIDs);

        void GetReturnedAttributes(
            [MarshalAs(UnmanagedType.I4)]
            int dwEventCategory,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwCount,
            [Out]
            out IntPtr ppdwAttributeIDs);

        void Refresh(
            [MarshalAs(UnmanagedType.I4)]
            int dwConnection);

        void CancelRefresh(
            [MarshalAs(UnmanagedType.I4)]
            int dwConnection);

        void GetState(
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pbActive,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwBufferTime,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwMaxSize,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int phClientSubscription);

        void SetState(
            IntPtr pbActive,
            IntPtr pdwBufferTime,
            IntPtr pdwMaxSize,
            [MarshalAs(UnmanagedType.I4)]
            int hClientSubscription,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwRevisedBufferTime,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwRevisedMaxSize);

        void SetKeepAlive(
            [MarshalAs(UnmanagedType.I4)]
            int dwKeepAliveTime,
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwRevisedKeepAliveTime);

        void GetKeepAlive(
            [Out][MarshalAs(UnmanagedType.I4)]
            out int pdwKeepAliveTime);
    }

    /// <exclude />
	public static class Constants
    {
        // category description string.
        public const string OPC_CATEGORY_DESCRIPTION_AE10 = "OPC Alarm & Event Server Version 1.0";

        // state bit masks.
        public const int CONDITION_ENABLED = 0x0001;
        public const int CONDITION_ACTIVE = 0x0002;
        public const int CONDITION_ACKED = 0x0004;

        // bit masks for change mask.
        public const int CHANGE_ACTIVE_STATE = 0x0001;
        public const int CHANGE_ACK_STATE = 0x0002;
        public const int CHANGE_ENABLE_STATE = 0x0004;
        public const int CHANGE_QUALITY = 0x0008;
        public const int CHANGE_SEVERITY = 0x0010;
        public const int CHANGE_SUBCONDITION = 0x0020;
        public const int CHANGE_MESSAGE = 0x0040;
        public const int CHANGE_ATTRIBUTE = 0x0080;

        // event type.
        public const int SIMPLE_EVENT = 0x0001;
        public const int TRACKING_EVENT = 0x0002;
        public const int CONDITION_EVENT = 0x0004;
        public const int ALL_EVENTS = 0x0007;

        // bit masks for QueryAvailableFilters().
        public const int FILTER_BY_EVENT = 0x0001;
        public const int FILTER_BY_CATEGORY = 0x0002;
        public const int FILTER_BY_SEVERITY = 0x0004;
        public const int FILTER_BY_AREA = 0x0008;
        public const int FILTER_BY_SOURCE = 0x0010;
    }
}