How to read Event Viewer Information from Code Unit

Use WMI Querys. WMI can be easily developed by using the WMITools provided by Microsoft: http://www.microsoft.com/downloads/details.aspx?FamilyID=6430f853-1120-48db-8cc5-f2abdc3ed314&DisplayLang=en

With the WMI CMI Studio you can create your SQL String, to get all Event Descriptions from one Application for example.

Because I used the WMI Automation Server only in a Delphi Applications I cannot give you some Navision examples. But I think you must create some Automation Variables of the Type Microsoft WMI Scripting V1.2 Library and the needed Subtypes Locator, Services and Object Set.

Maybe this Code Snippet could be helpful. I queries all events of the given Service.

VAR
  aLoc          : ISWbemLocator;
  aSrv          : ISWbemServices;
  aObjSet       : ISWbemObjectSet;
  pEnum         : IEnumvarIANT;
 
  aLoc := CoSWbemLocator.Create;
  aSrv := aLoc.ConnectServer(cConfig.sWMI_Host,'',
              cConfig.sWMI_User,cConfig.GetWMIPassword(),'','',0, nil);
  aSrv.Security_.ImpersonationLevel :=                    wbemImpersonationLevelImpersonate;

   aObjSet := aSrv.ExecQuery('SELECT EventType, Message,     
                                             TimeGenerated, InsertionStrings 
                                             FROM Win32_NTLogEvent WHERE  
                                             Logfile="Application" AND 
                                             SourceName="<Service Name>",
                                             'WQL', wbemFlagReturnImmediately +  
                                             wbemFlagForwardOnly, nil);
      pEnum := aObjSet.Get__NewEnum as IEnumvarIANT;

The enumeration contains the Response, but I don't know how to handle this in Navision? Be careful that for WMI Querys on localhost any User and Password should be given if you have administrative rights.