private void OnTimerElapsed(object sender)
{
EventTraceProperties properties = TraceSession.CreateProperties(this.sessionId, false);
if (NativeMethods.FlushTrace(this.sessionHandle, this.sessionName, ref properties) == 0)
{
this.EventsLost = properties.EventsLost;
}
}
public static string GetLogFilePath(string traceSessionName)
{
EventTraceProperties properties = TraceSession.CreateProperties(Guid.Empty, true);
int errorCode = NativeMethods.ControlTrace(0, traceSessionName, ref properties, TraceSession.EventTraceControlQuery);
if (errorCode != 0)
{
throw new Win32Exception(errorCode);
}
return(Path.GetDirectoryName(properties.LogFileName));
}
public TraceSession(string name, ProviderInfo providerInfo, TimeSpan flushInterval)
{
this.providerInfo = providerInfo;
this.flushInterval = flushInterval;
this.sessionId = Guid.NewGuid();
this.sessionName = name;
EventTraceProperties properties = TraceSession.CreateProperties(this.sessionId, false);
int errorCode = NativeMethods.StartTrace(out this.sessionHandle, this.sessionName, ref properties);
if (errorCode != 0)
{
throw new Win32Exception();
}
}
private static EventTraceProperties CreateProperties(Guid sessionId, bool createForQuery)
{
EventTraceProperties properties = new EventTraceProperties();
properties.Wnode = new EventTraceProperties.WnodeHeader();
properties.Wnode.BufferSize = (uint)TraceSession.EventTracePropertiesSize;
properties.Wnode.Flags = TraceSession.WnodeFlagTracedGuid;
properties.Wnode.Guid = sessionId;
properties.FlushTimer = 0;
properties.LogFileMode = createForQuery ? 0 : TraceSession.EventTraceRealTimeMode;
properties.LoggerNameOffset = (uint)(TraceSession.EventTracePropertiesSize -
(Marshal.SystemDefaultCharSize *
(EventTraceProperties.MaxLoggerNameLength +
EventTraceProperties.MaxLogFileNameLength)));
properties.LogFileNameOffset = (uint)(TraceSession.EventTracePropertiesSize -
(Marshal.SystemDefaultCharSize * EventTraceProperties.MaxLogFileNameLength));
return(properties);
}
private void Dispose(bool disposing)
{
if (this.traceHandle != TraceSession.InvalidHandle)
{
NativeMethods.CloseTrace(this.traceHandle);
this.traceHandle = TraceSession.InvalidHandle;
}
if (this.traceEnabled)
{
Guid localProviderId = this.providerInfo.Id;
NativeMethods.EnableTraceEx(
ref localProviderId,
IntPtr.Zero,
this.sessionHandle,
0,
0,
0,
0,
0,
IntPtr.Zero);
this.traceEnabled = false;
}
if (this.sessionHandle != 0)
{
EventTraceProperties properties = TraceSession.CreateProperties(this.sessionId, false);
NativeMethods.ControlTrace(this.sessionHandle, null, ref properties, TraceSession.EventTraceControlStop);
this.sessionHandle = 0;
}
if (disposing)
{
if (this.callbackHandle.IsAllocated)
{
this.callbackHandle.Free();
}
}
}
public static extern int FlushTrace(ulong SessionHandle, string SessionName, ref EventTraceProperties Properties);
public static extern int ControlTrace(ulong SessionHandle, string SessionName, ref EventTraceProperties Properties, uint ControlCode);
public static extern int StartTrace(out ulong SessionHandle, [MarshalAs(UnmanagedType.LPWStr)] string SessionName, ref EventTraceProperties Properties);