cant catch the Exception in the Concurrency Runtime

金旺王 25

Exception thrown at 0x7693483F (KernelBase.dll) in TongJiKeJiVR.exe: WinRT originate error - 0x80072746 : 'An existing connection was forcibly closed by the remote host.'.

Exception thrown at 0x7693483F in TongJiKeJiVR.exe: Microsoft C++ exception: Platform::COMException ^ at memory location 0x1547FB40. HRESULT:0x80072746 An existing connection was forcibly closed by the remote host.

WinRT : An existing connection was forcibly closed by the remote host.

Concurrency::create_task(_writer->StoreAsync()).then(
            [&](Concurrency::task<unsigned int> writeTask)
        {
            try
            {
                // Try getting an exception.
				        writeTask.get();
            }
            catch (...)
            {
                _socket = nullptr;
            }
			});

		
another way i tried
		
		 Concurrency::create_task(_writer->StoreAsync()).then(
            [&](Concurrency::task<unsigned int> writeTask)
        {
            try
            {
                // Try getting an exception.
				        writeTask.get();
            }
            catch (...)
            {
                _socket = nullptr;
            }
			      return writeTask;
			})
			.then([](concurrency::task< unsigned int > t)
		 {
			  try 
			  {
				   t.get();
				   // .get() didn't throw, so we succeeded.
			  }
			  catch (...)
			  {
				     dbg::trace(L" StoreAsync call failed with error2:");
			  }
		});
		
i have found similar question in https://www.it1352.com/486319.html & https://video2.skills-academy.com/en-us/cpp/parallel/concrt/exception-handling-in-the-concurrency-runtime?view=msvc-170&redirectedfrom=MSDN
but cant fix my issue with the way in the page

Minxin Yu 11,506 Reputation points Microsoft Vendor

2023-08-02T07:41:36.8233333+00:00

What type of C++ project are you using? Win32, MFC or UWP?
金旺王 25 Reputation points

2023-08-02T07:58:29.56+00:00

using UWP, develop for hololens
金旺王 25 Reputation points

2023-08-02T08:36:37.1033333+00:00

@Minxin Yu these code is part of the microsoft open souece project ”holensforCVS“ https://github.com/microsoft/HoloLensForCV Shared\HoloLensForCV\SensorFrameStreamingServer.cpp
Junjie Zhu - MSFT 17,386 Reputation points Microsoft Vendor

2023-08-02T09:37:04.7666667+00:00

Can the same problem be reproduced in the official sample ”holensforCVS“?

金旺王 25

yes, junjiezhu , i wrote some test code as bellow, exception E_FAIL can be catched, but COMException cannt

Concurrency::create_task(_writer->StoreAsync()).then(
				[&](Concurrency::task<unsigned int> writeTask)
			{
				_writeInProgress = false;
				throw ref new Platform::Exception(E_FAIL);
			}).then([](task<void> t)
			{
				try
				{
					t.get();
				}
				catch (Platform::Exception^ e)
				{
					dbg::trace(L"test exception %s",
						e->Message->Data());
				}

			});

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金旺王 25 Reputation points

2023-08-03T01:11:30.62+00:00
_write is create from a socket

_writer = ref new Windows::Storage::Streams::DataWriter( _socket->OutputStream);
Junjie Zhu - MSFT 17,386 Reputation points Microsoft Vendor

2023-08-03T09:28:03.6433333+00:00

This is an unexpected behavior. Try to use _com_error to throw a COMException directly, can it be catched?
金旺王 25 Reputation points

2023-08-04T01:49:55.16+00:00

@Junjie Zhu in WINRT C++/CX， no such _"_com error" defined
Junjie Zhu - MSFT 17,386 Reputation points Microsoft Vendor

2023-08-07T13:05:01.9733333+00:00

Hi Jinwang,

Since I don't have a HoloLens device, I can't run the HoloLens sample. Have you checked the document of task. get? Is there a case where an exception will be thrown? and if there are other exceptions that cause your com exception to not be caught.

Thank you.

金旺王 25

hi junjie, i checked , normally, it should thrown some socket exception.

I wrote a test code list below to test the "Async"' task's exception, still cant catch the exception, can you help me try it in your visual studio， maybe i make some Stupid mistakes,but dont know where

using visual studio 2017 & direx11 & xaml common project

Windows::Networking::Sockets::StreamSocketListener^ _listener;
	// Initialize stream socket listener and beginning 
		// looking for connections
	_listener = ref new Windows::Networking::Sockets::StreamSocketListener();


	_listener->Control->KeepAlive = true;


#if 1
	

	// Don't limit traffic to an address or an adapter.
	Concurrency::create_task(_listener->BindServiceNameAsync("555")).then(
		[this](Concurrency::task<void> previousTask)
		{
			try
			{
				// Try getting an exception.
				// previousTask.get();
				throw ref new Platform::Exception(E_FAIL);
			}
			catch (...)
			{
				OutputDebugString(L"Platform::Exception");
			}
			return previousTask;
		}).then([](concurrency::task< void > t)
			{
				try
				{
					t.get();
					// .get() didn't throw, so we succeeded.
				}
				catch (...)
				{
					OutputDebugString(L"Platform::Exception 2");
				}
			}).wait();
#endif

金旺王 25

hi junjie, i checked , normally, it should thrown some socket exception.

I wrote a test code list below to test the "Async"' task's exception, still cant catch the exception, can you help me try it in your visual studio， maybe i make some Stupid mistakes,but dont know where

using visual studio 2017 & direx11 & xaml common project

C++


Windows::Networking::Sockets::StreamSocketListener^ _listener;
	// Initialize stream socket listener and beginning 
		// looking for connections
	_listener = ref new Windows::Networking::Sockets::StreamSocketListener();


	_listener->Control->KeepAlive = true;



	

	// Don't limit traffic to an address or an adapter.
	Concurrency::create_task(_listener->BindServiceNameAsync("555")).then(
		[this](Concurrency::task<void> previousTask)
		{
			try
			{
				// Try getting an exception.
				// previousTask.get();
				throw ref new Platform::Exception(E_FAIL);
			}
			catch (...)
			{
				OutputDebugString(L"Platform::Exception");
			}
			return previousTask;
		}).then([](concurrency::task< void > t)
			{
				try
				{
					t.get();
					// .get() didn't throw, so we succeeded.
				}
				catch (...)
				{
					OutputDebugString(L"Platform::Exception 2");
				}
			}).wait();

Junjie Zhu - MSFT 17,386 Reputation points Microsoft Vendor

2023-08-18T02:39:27.1933333+00:00

Hi @金旺王 ,

Have you checked my reply about can't catch the Exception in the Concurrency Runtime?

金旺王 25

There is a misunderstanding, i want to catch the socket exception , not the E_FAIL exception i added for test

Concurrency::create_task(_listener->BindServiceNameAsync("555")).then(  //service 555 actually not exist 

		[this](Concurrency::task<void> previousTask)

		{

			try

			{

				// Try getting an exception.

				previousTask.get();

			}

			catch (...)              /*I want to catch the socket exception    

                                      'At least one of either InternetClientServer 

                                   or PrivateNetworkClientServer capabilities is 

                                   required to listen for or receive traffic' */

			{

				OutputDebugString(L"Platform::Exception");

			}

			return previousTask;

		});

Junjie Zhu - MSFT 17,386 Reputation points Microsoft Vendor

2023-08-23T06:44:02.5633333+00:00

Hi @金旺王 ,

Can you reproduce your problem in the official sample StreamSocket, and if so, could you please provide detailed steps so that we can check the problem for you.
Junjie Zhu - MSFT 17,386 Reputation points Microsoft Vendor

2023-08-23T11:48:05.49+00:00

I use the official sample StreamSocket, and it can catch socket exceptions. Currently I don’t have VS2017, in VS2022, you can set the exception type you want to catch in Debug>Windows>Exception Setting, It can also be opened by Ctrl+Alt+E.

Accepted answer

Junjie Zhu - MSFT 17,386 Reputation points Microsoft Vendor

2023-08-16T12:34:15.8366667+00:00
Hi @金旺王 ,

Welcome to Microsoft Q&A!

I use your code and test it in UWP C++/WinRT project, and the wait() cannot be used in UWP.

If you want to get Exception in concurrency::task<void> t, you need to re-throw the Exception in Concurrency::task<void> previousTask to pass the exception to task t.

Concurrency::create_task(_listener->BindServiceNameAsync("555")).then( [this](Concurrency::task<void> previousTask) { try { // Try getting an exception. // previousTask.get(); throw ref new Platform::Exception(E_FAIL); } catch (...) { OutputDebugString(L"Platform::Exception"); throw; } return previousTask; }).then([](concurrency::task< void > t) { try { t.get(); // .get() didn't throw, so we succeeded. } catch (...) { OutputDebugString(L"Platform::Exception 2"); } }).wait();

Thank you.

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金旺王 25 Reputation points

2023-08-23T09:06:04.03+00:00

hi Junjie Zhu:

Thanks for your support, I guess i have found the answer, someone has raised the same issue 10 years ago, please refer to below link.

https://social.msdn.microsoft.com/forums/en-US/b55dbfad-6a00-4e42-b481-080fbcfa3ef1/ccx-streamsocket-wrong-ip-or-port-or-connection-error?forum=winappswithnativecode

but i my VS2017 , "If there is a handler for the exception, the program maybe run safety" was deleted
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Junjie Zhu - MSFT 17,386 Reputation points Microsoft Vendor

2023-08-28T06:08:15.0866667+00:00

I use the official sample StreamSocket, and it can catch socket exceptions. Currently I don’t have VS2017, in VS2022, you can set the exception type you want to catch in Debug>Windows>Exception Setting, It can also be opened by Ctrl+Alt+E.
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