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An Urgent Problem With Reading Event Logger

Posted on 1998-05-27
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Last Modified: 2013-12-03
why isn't this program returning the correct EventID code
from the logger and always return 0 even when all events in the logger are with diffrent id  ?
In fact this is very much alike the sample program in the
sdk ?


#include  <stdio.h>
#include "events.hpp"
#include <iostream.h>      

void EventThread::RunThread()
{

      HANDLE h,hEvent;
      EVENTLOGRECORD *m_event;
      BYTE bBuffer[MAX_PATH];
      DWORD dwRead,dwNeeded,cRecords=0,dwThisRecord =0;
      

    h = OpenEventLog(NULL,"Application");
    if (h == NULL)
      {
            cout << "can't open the event logger";
      }

      m_event = (EVENTLOGRECORD*) &bBuffer;

      hEvent = CreateEvent( LPSECURITY_ATTRIBUTES(NULL) ,
                                      FALSE,
                                      FALSE,
                                 "EventHandle");

      if (!GetNumberOfEventLogRecords(h,&cRecords))
            cout << "error . Couldn't read or write ";
      else
            cout << "number of records in the system  event log is :"
                   << cRecords << endl;

      cout << "Waiting for more events \n";
      while(1)
      {
            
            NotifyChangeEventLog(h,hEvent);
            WaitForSingleObject(hEvent,INFINITE);
            {
                  ReadEventLog(h,
                         EVENTLOG_BACKWARDS_READ,
                               0,
                               m_event,
                               sizeof(EVENTLOGRECORD),
                               &dwRead,
                               &dwNeeded);
            

      if (m_event->EventType == EVENTLOG_ERROR_TYPE )
                  {
                        switch (m_event->EventID)
                        {
                        case 4:
                              {
                            cout << " ccc was notified about bad sector on disk ";
                              }
                        default:
                              cout << " A Unknown event was raised ";
                        }
                  }
                        
            m_event = (EVENTLOGRECORD*) &bBuffer;
            }
      }

      CloseEventLog(h);
}


UTL_Status EventThread::StopThread(DWORD number)
{

      // TODO
      return 0;
}



void main()
{

      EventThread* local = new EventThread;
      local->RunThread();

}
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Question by:sector
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1 Comment
 

Accepted Solution

by:
mwalsh111097 earned 800 total points
ID: 1404369
If you check the return from the ReadEventLog() function, you will find that it is, in fact, failing.  GetLastError returns 0x57, which indicates an invalid parameter to the function.  When you change the flags to be "EVENTLOG_BACKWARDS_READ | EVENTLOG_SEQUENTIAL_READ" and change the buffer size to be "sizeof(bBuffer)" then everything works as it should.
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