private static WFD.IAsyncCausalityTracerStatics LoadFactory()
{
if (!Environment.IsWinRTSupported)
{
return(null);
}
//COM Class Id
string ClassId = "Windows.Foundation.Diagnostics.AsyncCausalityTracer";
//COM Interface GUID {50850B26-267E-451B-A890-AB6A370245EE}
Guid guid = new Guid(0x50850B26, 0x267E, 0x451B, 0xA8, 0x90, 0XAB, 0x6A, 0x37, 0x02, 0x45, 0xEE);
Object factory = null;
WFD.IAsyncCausalityTracerStatics validFactory = null;
try
{
int hresult = Microsoft.Win32.UnsafeNativeMethods.RoGetActivationFactory(ClassId, ref guid, out factory);
if (hresult < 0 || factory == null)
{
return(null); //This prevents having an exception thrown in case IAsyncCausalityTracerStatics isn't registered.
}
validFactory = (WFD.IAsyncCausalityTracerStatics)factory;
EventRegistrationToken token = validFactory.add_TracingStatusChanged(new EventHandler <WFD.TracingStatusChangedEventArgs>(TracingStatusChangedHandler));
Contract.Assert(token != null, "EventRegistrationToken is null");
}
catch (Exception)
{
// Although catching generic Exception is not recommended, this file is one exception
// since we don't want to propagate any kind of exception to the user since all we are
// doing here depends on internal state.
return(null);
}
return(validFactory);
}
private static WFD.IAsyncCausalityTracerStatics LoadFactory()
{
//COM Class Id
string ClassId = "Windows.Foundation.Diagnostics.AsyncCausalityTracer";
//COM Interface GUID {50850B26-267E-451B-A890-AB6A370245EE}
Guid guid = new Guid(0x50850B26, 0x267E, 0x451B, 0xA8, 0x90, 0XAB, 0x6A, 0x37, 0x02, 0x45, 0xEE);
Object factory = null;
try
{
factory = Microsoft.Win32.UnsafeNativeMethods.RoGetActivationFactory(ClassId, ref guid);
}
catch (COMException)
{
//IAsyncCausalityTracerStatics interface not present in this OS
return(null);
}
catch (EntryPointNotFoundException)
{
//RoGetActivationFactory method not present in combase.dll
return(null);
}
catch (DllNotFoundException)
{
//combase.dll not found
return(null);
}
WFD.IAsyncCausalityTracerStatics validFactory = (WFD.IAsyncCausalityTracerStatics)factory;
EventRegistrationToken token = validFactory.add_TracingStatusChanged(new EventHandler <WFD.TracingStatusChangedEventArgs>(TracingStatusChangedHandler));
Contract.Assert(token != null, "EventRegistrationToken is null");
return(validFactory);
}
static AsyncCausalityTracer()
{
if (!Environment.IsWinRTSupported) return;
//COM Class Id
string ClassId = "Windows.Foundation.Diagnostics.AsyncCausalityTracer";
//COM Interface GUID {50850B26-267E-451B-A890-AB6A370245EE}
Guid guid = new Guid(0x50850B26, 0x267E, 0x451B, 0xA8, 0x90, 0XAB, 0x6A, 0x37, 0x02, 0x45, 0xEE);
Object factory = null;
try
{
int hresult = Microsoft.Win32.UnsafeNativeMethods.RoGetActivationFactory(ClassId, ref guid, out factory);
if (hresult < 0 || factory == null) return; //This prevents having an exception thrown in case IAsyncCausalityTracerStatics isn't registered.
s_TracerFactory = (WFD.IAsyncCausalityTracerStatics)factory;
EventRegistrationToken token = s_TracerFactory.add_TracingStatusChanged(new EventHandler<WFD.TracingStatusChangedEventArgs>(TracingStatusChangedHandler));
Contract.Assert(token != default(EventRegistrationToken), "EventRegistrationToken is null");
}
catch (Exception ex)
{
// Although catching generic Exception is not recommended, this file is one exception
// since we don't want to propagate any kind of exception to the user since all we are
// doing here depends on internal state.
LogAndDisable(ex);
}
}
