Github user JPercivall commented on a diff in the pull request: https://github.com/apache/nifi/pull/525#discussion_r67440428 --- Diff: nifi-nar-bundles/nifi-windows-event-log-bundle/nifi-windows-event-log-processors/src/main/java/org/apache/nifi/processors/windows/event/log/jna/WEvtApi.java --- @@ -0,0 +1,62 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.nifi.processors.windows.event.log.jna; + +import com.sun.jna.Native; +import com.sun.jna.Pointer; +import com.sun.jna.platform.win32.WinDef; +import com.sun.jna.platform.win32.WinNT; +import com.sun.jna.win32.StdCallLibrary; +import com.sun.jna.win32.W32APIOptions; + +/** + * JNA will create the instance of this interface with Native.loadLibrary(). + * Please see https://msdn.microsoft.com/en-us/library/windows/desktop/aa385772(v=vs.85).aspx for documentation on the methods and data structures. + */ +public interface WEvtApi extends StdCallLibrary { + WEvtApi INSTANCE = (WEvtApi) Native.loadLibrary("wevtapi", WEvtApi.class, W32APIOptions.DEFAULT_OPTIONS); + + WinNT.HANDLE EvtSubscribe(WinNT.HANDLE session, WinNT.HANDLE signalEvent, String channelName, String xpathQuery, + WinNT.HANDLE bookmark, WinDef.PVOID context, EVT_SUBSCRIBE_CALLBACK evtSubscribeCallback, int flags); + + boolean EvtRender(WinNT.HANDLE context, WinNT.HANDLE fragment, int flags, int bufferSize, Pointer buffer, Pointer bufferUsed, Pointer propertyCount); + + interface EvtSubscribeNotifyAction { + int ERROR = 0; + int DELIVER = 1; + } + + interface EvtSubscribeFlags { --- End diff -- What is the purpose of this and EvtRenderFlags? Only the SUBSCRIBE_TO_FUTURE and EVENT_XML values are used.
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