/// <summary>
/// De-serializes the user data associated with each ETW event in this session.
/// </summary>
/// <param name="eventTrace">ETW native representation of the event</param>
/// <remarks>
/// This method is called by ETW for each event in this session.
/// </remarks>
private unsafe void OnTraceEvent(ref NativeMethods.EventTrace eventTrace)
{
var pData = (byte *)eventTrace.MofData;
var length = (int)eventTrace.MofLength;
if (pData != null)
{
using (var stream = new UnmanagedMemoryStream(pData, length, length, FileAccess.Read))
{
var breader = new BinaryReader(stream);
int traceFunc;
breader.BaseStream.Position = 0;
// 130623 not sure if this always the case but citrix user traces have func id
// in first two bytes and appear to have 'Type' 255
if (eventTrace.Type == 255)
{
// this works for user traces
traceFunc = BitConverter.ToInt16(breader.ReadBytes(2), 0); //.ReadByte();
}
else
{
// this works for kernel traces
traceFunc = eventTrace.Type;
}
byte[] eventStringBytes = breader.ReadBytes((int)(breader.BaseStream.Length)); // / 2);
RaiseEventRead(eventTrace.Guid, eventTrace, eventStringBytes, traceFunc);
breader.Close();
}
}
}
/// <summary>
/// ctor.
/// </summary>
/// <param name="eventGuid">The event GUID.</param>
/// <param name="eventTrace">The event trace.</param>
/// <param name="eventStringBytes">The event string bytes.</param>
/// <param name="traceFunc">The trace func.</param>
public EventReadEventArgs(Guid eventGuid,
NativeMethods.EventTrace eventTrace, byte[] eventStringBytes, int traceFunc)
{
_eventGuid = eventGuid;
_eventStringBytes = eventStringBytes;
_eventTrace = eventTrace;
_traceFunc = traceFunc;
}
/// <summary>
/// Raises the EventRead event.
/// </summary>
/// <param name="eventGuid">Guid associated with the event</param>
/// <param name="eventTrace">The event trace.</param>
/// <param name="eventStringBytes">The event string bytes.</param>
/// <param name="traceFunc">The trace func.</param>
private void RaiseEventRead(Guid eventGuid, NativeMethods.EventTrace eventTrace, byte[] eventStringBytes,
int traceFunc)
{
_onRaiseEventReadCount++;
EventHandler <EventReadEventArgs> eventRead = EventRead;
if (eventRead != null)
{
eventRead(this, new EventReadEventArgs(eventGuid, eventTrace, eventStringBytes, traceFunc));
}
}
