public EventRealtimeListener(Guid providerGuid, string sessionName, EtwTraceLevel level, long keyword)
{
if (providerGuid == Guid.Empty)
{
throw new ArgumentException(null, nameof(providerGuid));
}
if (sessionName == null)
{
throw new ArgumentNullException(nameof(sessionName));
}
_cb = OnEvent;
_rcb = OnRecordEvent;
ProviderGuid = providerGuid;
SessionName = sessionName;
int status;
IntPtr properties = BuildProperties(false, out int size);
try
{
status = StartTrace(out _handle, SessionName, properties);
if (status != 0)
{
if (status != ERROR_ALREADY_EXISTS)
{
throw new Win32Exception(status);
}
// this can happen if something went wrong on another session with the same name
// so let's try to stop this existing thing and restart
StopTrace();
status = StartTrace(out _handle, SessionName, properties);
if (status != 0)
{
throw new Win32Exception(status);
}
}
}
catch (Exception e)
{
App.AddTrace("EventRealtimeListener e:" + e);
return;
}
finally
{
Marshal.FreeCoTaskMem(properties);
}
status = EnableTraceEx(providerGuid, IntPtr.Zero, _handle, 1, (byte)level, keyword, keyword, 0, IntPtr.Zero);
if (status != 0)
{
throw new Win32Exception(status);
}
_traceOn = true;
}
private void OpenEtlFile()
{
// Retained the delegate objects to avoid GC.
EventRecordCallbackRetainer = new EventRecordCallback(EventRecordCallback);
BufferCallbackRetainer = new BufferCallback(BufferCallback);
// Open the ETL log file.
EVENT_TRACE_LOGFILE traceLogFile = new EVENT_TRACE_LOGFILE
{
LogFileName = EtlFilePath,
ProcessTraceMode = EventTracingApi.PROCESS_TRACE_MODE_EVENT_RECORD,
BufferCallback = BufferCallbackRetainer,
EventCallback = EventRecordCallbackRetainer,
};
TraceHandle = EventTracingApi.OpenTrace(ref traceLogFile);
if (EventTracingApi.IsInvalidProcessTraceHandle(TraceHandle))
{
var win32ErrorCode = Marshal.GetLastWin32Error();
string exceptionMessage;
if (win32ErrorCode == Win32ErrorCode.ERROR_FILE_CORRUPT)
{
exceptionMessage = string.Format("OpenTrace function failed. The file '{0}' is corrupted.", EtlFilePath);
}
else
{
exceptionMessage = string.Format("OpenTrace function failed. The file tried to open was '{0}'.", EtlFilePath);
}
throw new Win32Exception(win32ErrorCode, exceptionMessage);
}
}
public void Open()
{
Guid localProviderId = this.providerInfo.Id;
int errorCode = NativeMethods.EnableTraceEx(
ref localProviderId,
IntPtr.Zero,
this.sessionHandle,
1,
this.providerInfo.Level,
(ulong)this.providerInfo.Keywords,
0,
0,
IntPtr.Zero);
if (errorCode != 0)
{
throw new Win32Exception();
}
this.traceEnabled = true;
EventTraceLogfile logFile = new EventTraceLogfile();
logFile.ProcessTraceMode = TraceSession.ProcessTraceModeRealTime | TraceSession.ProcessTraceModeEventRecord;
logFile.LoggerName = this.sessionName;
// The callback must be pinned to keep it in scope outside of this method
EventRecordCallback callback = new EventRecordCallback(this.EventRecordCallback);
this.callbackHandle = GCHandle.Alloc(callback);
logFile.EventRecordCallback = callback;
this.traceHandle = NativeMethods.OpenTrace(ref logFile);
if (this.traceHandle == InvalidHandle)
{
throw new Win32Exception();
}
}
private void InitializeTraceHandle()
{
if (traceHandle == 0)
{
this.eventTraceLogFile = new EventTraceLogfile
{
ProcessTraceMode = TraceModeEventRecord,
LogFileName = this.fileName
};
// wrap callback in GCHandle to prevent object from being garbage collected
EventRecordCallback callback = this.EventRecordCallback;
this.callbackHandle = GCHandle.Alloc(callback);
this.eventTraceLogFile.EventRecordCallback = this.EventRecordCallback;
this.traceHandle = NativeMethods.OpenTrace(ref eventTraceLogFile);
if (this.traceHandle == InvalidHandle)
{
throw new Win32Exception();
}
this.EventsLost = this.eventTraceLogFile.LogfileHeader.EventsLost;
}
}
