Strange exceptions in ASP.NET + COM application

Hello!
We have some code that is written in COM. It was used in a
"ISAPI-extension server " and everithing was fine. And it is fine at
the moment.
But now this code is used from the ASP.NET server. And we receive some
unknown exceptions. Them occurs after a long period of working (about
of 10,000 stress-test-queries). We can't ever recognize these
exceptions.
For example, yesterday I've received an exception in the method:
STDMETHODIMP CGobiSrv::put_FSCreator(IUnknown* fsCreator)
{
SAFE_METHOD_START("CGobiSrv::put_FSCreator")
AFX_MANAGE_STATE(AfxGetStaticModuleState
())
serve->SetFSCreator( fsCreator );
GTRACEL("FSCreator received\n");
return S_OK;
SAFE_METHOD_END
}
We try to catch exceptions using the following code:
#define SAFE_METHOD_START(method_name) \
CMethodExecutionViewer method_ex_viewer( this->GetClassID(),
this->GetInstanceNum(), method_name ); \
try { \
#define SAFE_METHOD_END \
} catch (std::exception& e) { \
method_ex_viewer.ViewException( "standard", e.what() ); \
return E_FAIL; \
} catch (CException* e) { \
const int MAX_ERR_LEN = 256; \
GBuffer<TCHAR> err_msg(MAX_ERR_LEN); \
e->GetErrorMessage( err_msg, MAX_ERR_LEN ); \
method_ex_viewer.ViewException( _TEXT("MFC"), static_cast<TCHAR*>(
err_msg ) ); \
return E_FAIL; \
} catch (_com_error &e) { \
method_ex_viewer.ViewException( _TEXT("COM"), e.ErrorMessage() ); \
return E_FAIL; \
} catch (CAtlException &e) { \
const int MAX_ERR_LEN = 256; \
GBuffer<TCHAR> hr_code(MAX_ERR_LEN); \
ltoa(e, hr_code, 16); \
method_ex_viewer.ViewException( _TEXT("ATL"), static_cast<TCHAR*>(
hr_code ) ); \
return E_FAIL; \
} catch (...) { \
method_ex_viewer.ViewException( "unknown", "" ); \
return E_FAIL; \
} \
and our exceptions are always fall into the catch (...) section.
There is some EnterCriticalSection()/LeaveCriticalSection() that occurs
in SetFSCreator() method because of the fact that some global data is
shared between COM-objects. It's is because we use very legacy code.
Maybe the error is somewhere in interlocking, but why it's working in
the ISAPI-mode?
We use _ATL_APARTMENT_THREADED. We tried to run ASP script with and
without ASPCompat="true". We tried to run on .NET 1.1 and .NET 2.0. The
song remains the same.
It's very hard to debug. Because these exceptions occurs in different
places and after a long time of working.
Can anybody help us?
Danilyou need to set AspCompat=true, to support STA (apartment model) com
objects. also are you calling Marshal.ReleaseComObject(), to release the
object?
note: STA com objected can not be used directly from a webservice.
-- bruce (sqlwork.com)
<danil.shopyrin@.gmail.com> wrote in message
news:1142265254.460924.183160@.i39g2000cwa.googlegroups.com...
> Hello!
> We have some code that is written in COM. It was used in a
> "ISAPI-extension server " and everithing was fine. And it is fine at
> the moment.
> But now this code is used from the ASP.NET server. And we receive some
> unknown exceptions. Them occurs after a long period of working (about
> of 10,000 stress-test-queries). We can't ever recognize these
> exceptions.
> For example, yesterday I've received an exception in the method:
> STDMETHODIMP CGobiSrv::put_FSCreator(IUnknown* fsCreator)
> {
> SAFE_METHOD_START("CGobiSrv::put_FSCreator")
> AFX_MANAGE_STATE(AfxGetStaticModuleState
())
> serve->SetFSCreator( fsCreator );
> GTRACEL("FSCreator received\n");
> return S_OK;
> SAFE_METHOD_END
> }
> We try to catch exceptions using the following code:
> #define SAFE_METHOD_START(method_name) \
> CMethodExecutionViewer method_ex_viewer( this->GetClassID(),
> this->GetInstanceNum(), method_name ); \
> try { \
> #define SAFE_METHOD_END \
> } catch (std::exception& e) { \
> method_ex_viewer.ViewException( "standard", e.what() ); \
> return E_FAIL; \
> } catch (CException* e) { \
> const int MAX_ERR_LEN = 256; \
> GBuffer<TCHAR> err_msg(MAX_ERR_LEN); \
> e->GetErrorMessage( err_msg, MAX_ERR_LEN ); \
> method_ex_viewer.ViewException( _TEXT("MFC"), static_cast<TCHAR*>(
> err_msg ) ); \
> return E_FAIL; \
> } catch (_com_error &e) { \
> method_ex_viewer.ViewException( _TEXT("COM"), e.ErrorMessage() ); \
> return E_FAIL; \
> } catch (CAtlException &e) { \
> const int MAX_ERR_LEN = 256; \
> GBuffer<TCHAR> hr_code(MAX_ERR_LEN); \
> ltoa(e, hr_code, 16); \
> method_ex_viewer.ViewException( _TEXT("ATL"), static_cast<TCHAR*>(
> hr_code ) ); \
> return E_FAIL; \
> } catch (...) { \
> method_ex_viewer.ViewException( "unknown", "" ); \
> return E_FAIL; \
> } \
> and our exceptions are always fall into the catch (...) section.
> There is some EnterCriticalSection()/LeaveCriticalSection() that occurs
> in SetFSCreator() method because of the fact that some global data is
> shared between COM-objects. It's is because we use very legacy code.
> Maybe the error is somewhere in interlocking, but why it's working in
> the ISAPI-mode?
> We use _ATL_APARTMENT_THREADED. We tried to run ASP script with and
> without ASPCompat="true". We tried to run on .NET 1.1 and .NET 2.0. The
> song remains the same.
> It's very hard to debug. Because these exceptions occurs in different
> places and after a long time of working.
> Can anybody help us?
> --
> Danil
>
Dear Bruce,
thank you for your reply.
I try to use Marshal.ReleaseComObject(). I check the returm value and
it always equals to 0.
Exceptions are still here. The problem is that I don't know what to
catch. I don't understand what's happened. I afraid that something is
happened with the host aspnet_wp process.
There is anonther question. Is there a way to 'reboot' aspnet_wp
process sometimes? For example, one time for each 1000 requests. It can
help to avoid the problem, if we can't solve them.