The exception is not thrown. See the code below for exception catching. I see no entries in my log file. try { vResults = new CComVariant((*dac)->ReadMultipleItems(machine.c_str(), server.c_str(), CComVariant(LPSAFEARRAY(*ItemInArray)), vMissing)); } catch(_com_error& e) { _bstr_t bstrSource(e.Source()); _bstr_t bstrDescription(e.Description()); *log << "Exception " << e.Error() << ": " << e.ErrorMessage() << ". Source: " << (LPCTSTR) bstrSource << ". Description: " << (LPCTSTR) bstrDescription << "." << endl; }

Hello,At the moment I am running your newest version and I am catching the exceptions. The application does not crash anymore. However, at some point the application stops retriving values from the OPC Server and does not recover on its own -- the application must be manually terminated and re-started. This is the original problem.The problem is not at the server end because, after the client is re-started, the whole process works again. The problem appears to be in automatically re-establishing contact with the server.

For a while it seemed to work, partially because the OPC server crashed twice. However, the problem has re-appeared twice in the last three days. Thus, the update to your newest version did not cure the problem, at least not fully. What can I do? Shall we try via a debug build of this new version?I and paticularly my client are getting a bit desparate for a running system ... time is starting to be important.

Thank you! Because of the holidays, I only now got to download it but I will try it now and let you know how it goes.

Hi, I'm happy that you can reproduce the error. Good luck hunting the memory error.In the meantime, I have modified my code so that the reading is done like so:try{ vResults = new CComVariant((*dac)->ReadMultipleItems(machine.c_str(), server.c_str(), CComVariant(LPSAFEARRAY(*ItemInArray)), vMissing));}catch(_com_error& e){ _bstr_t bstrSource(e.Source()); _bstr_t bstrDescription(e.Description()); _tprintf(_T("Exception %08lx: %s. Source: %s. Description: %s.\n"), e.Error(), e.ErrorMessage(), (LPCTSTR) bstrSource, (LPCTSTR) bstrDescription);}My question is: Will this prevent a crash eventhough you have a memory corruption? Thanks. I will keep you posted on developments. Thank you very much for your prompt and good help !!Best, Patrick