[DllImport("dmp.dll", CharSet = CharSet.Auto, EntryPoint = "StartLogging")]
public static extern int StartLogging(String AdapterName,
  PLOG_RECORD_CALLBACK LogRecordCallback,
  SafeWaitHandle StopLoggingEvent);

AutoResetEvent StopEvent = new AutoResetEvent(false);

StartLogging(comboBox1.Text, CallbackProcedure, StopEvent.SafeWaitHandle);

StopEvent.Set();

_WaitEvent := TSimpleEvent.Create(nil, resetmanual {boolean}, false, '', false);
_WaitEvent.SetEvent;
_WaitEvent.WaitFor;