BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Exception handling          BorlandTalk.com Forum Index -> C++ Builder (ActiveX) View previous topic :: View next topic   Author Message Marcel Guest Posted: Thu Sep 23, 2004 9:02 am    Post subject: Exception handling Imagine the method of my Active Server Object which will throw an exception when _ansicodepage is 'XXX'. The function is part of my Active Server Object which methods are called from an ASP page. I was asking myself why this exception does not print out 'Ansicodepage is XXX' in the users browser whenever the method is called like CBuilderObject.setAnsiCodePage "XXX" from the ASP page (so _ansicode is 'XXX'). Instead of this error-message i am getting a standard message in the browser: something like 'an exception occured: CBuilderObject.setAnsiCodePage' ### #include "MYOBJECTIMPL.H" STDMETHODIMP TmyObjectImpl::setAnsiCodePage(BSTR _ansicodepage) { try { if (wcscmp(_ansicodepage, L"XXX") == 0) { throw Exception("Ansicodepage is XXX"); } ansicodepage = AnsiString(_ansicodepage); } catch(Exception &e) { return Error(e.Message.c_str(), IID_ImyObject); } return S_OK; } ### Back to top Remy Lebeau (TeamB) Guest Posted: Thu Sep 23, 2004 5:29 pm    Post subject: Re: Exception handling "Marcel" <geenspam (AT) hottentottententententoonstellingen (DOT) com> wrote Quote: I was asking myself why this exception does not print out 'Ansicodepage is XXX' in the users browser whenever the method is called like CBuilderObject.setAnsiCodePage "XXX" from the ASP page (so _ansicode is 'XXX'). Because it is not supposed to. That is not how things work. Does your ASO support the ISupportErrorInfo interface, by chance? Gambit Back to top Marcel Guest Posted: Thu Sep 23, 2004 7:17 pm    Post subject: Re: Exception handling "Remy Lebeau (TeamB)" <no.spam (AT) no (DOT) spam.com> wrote Quote: "Marcel" <geenspam (AT) hottentottententententoonstellingen (DOT) com> wrote in message news:41529107 (AT) newsgroups (DOT) borland.com... I was asking myself why this exception does not print out 'Ansicodepage is XXX' in the users browser whenever the method is called like CBuilderObject.setAnsiCodePage "XXX" from the ASP page (so _ansicode is 'XXX'). Because it is not supposed to. That is not how things work. Does your ASO support the ISupportErrorInfo interface, by chance? Gambit Hi Gambit, Sorry i am still a beginner. I don't know the ISupportErrorInfo interface and really i do not know how to implement it in my ASO. If it isn't hard to implement can you give me a short explanation of it. I want to help the users of my ASO with errormessages that make sens so it can help them to debug theirs ASP scripts. Marcel Back to top Remy Lebeau (TeamB) Guest Posted: Thu Sep 23, 2004 9:16 pm    Post subject: Re: Exception handling "Marcel" <info (AT) xxxremovethisxxxmediaquest (DOT) nl> wrote Quote: Sorry i am still a beginner. I don't know the ISupportErrorInfo interface and really i do not know how to implement it in my ASO. Simply add ISupportErrorInfoImpl to the list of classes that your ASO implementation class derives from. Quote: If it isn't hard to implement can you give me a short explanation of it. ISupportErrorInfo Interface http://msdn.microsoft.com/library/en-us/automat/htm/chap11_2fqd.asp Quote: I want to help the users of my ASO with errormessages that make sens so it can help them to debug theirs ASP scripts. It is not your responsibility to display errors. It is the responsibility of the scripts to query your ASO for any error info they need. In my own ActiveX objects, I simply expose a LastErrorMsg property that returns the last message string that was passed to Error(). In the case of ASO, languages such as VBScript have a built-in global Error object that can return information about the last error that occured in an ActiveX object, via the IErrorInfo interface, which ISupportErrorInfo helps provide access to. LAst I checked, Borland already implements IErrorInfo in its ActiveX objects, but not ISupportErrorInfo. Gambit Back to top Marcel Guest Posted: Fri Sep 24, 2004 9:50 am    Post subject: Re: Exception handling "Remy Lebeau (TeamB)" <no.spam (AT) no (DOT) spam.com> schreef in bericht news:41533d1d$1 (AT) newsgroups (DOT) borland.com... Quote: "Marcel" <info (AT) xxxremovethisxxxmediaquest (DOT) nl> wrote in message news:4153214d$1 (AT) newsgroups (DOT) borland.com... Sorry i am still a beginner. I don't know the ISupportErrorInfo interface and really i do not know how to implement it in my ASO. Simply add ISupportErrorInfoImpl to the list of classes that your ASO implementation class derives from. If it isn't hard to implement can you give me a short explanation of it. ISupportErrorInfo Interface http://msdn.microsoft.com/library/en-us/automat/htm/chap11_2fqd.asp I want to help the users of my ASO with errormessages that make sens so it can help them to debug theirs ASP scripts. It is not your responsibility to display errors. It is the responsibility of the scripts to query your ASO for any error info they need. In my own ActiveX objects, I simply expose a LastErrorMsg property that returns the last message string that was passed to Error(). In the case of ASO, languages such as VBScript have a built-in global Error object that can return information about the last error that occured in an ActiveX object, via the IErrorInfo interface, which ISupportErrorInfo helps provide access to. LAst I checked, Borland already implements IErrorInfo in its ActiveX objects, but not ISupportErrorInfo. Gambit Ok thanks Gambit, so your LastErrorMsg property contains the last errormessage? I.e.?: STDMETHODIMP TmyASOImpl::myMethod(int x) { try { if(x > 100) { LastErrorMsg = "x is higher than 100"; } } } catch(Exception &e) { return Error(e.Message.c_str(), IID_ImyASO); } return S_OK; } Oh no sorry i am sure that is not what you meant.... Marcel Back to top Remy Lebeau (TeamB) Guest Posted: Fri Sep 24, 2004 4:41 pm    Post subject: Re: Exception handling "Marcel" <sorryafraidofspam (AT) nospam (DOT) com> wrote Quote: Ok thanks Gambit, so your LastErrorMsg property contains the last errormessage? I.e.?: That is not how I implement it. I replace calls to Error() with calls to a custom method that records the error message into a member variable of the class, then the property simply returns that value. class TmyASOImpl { private: AnsiString FLastErrorMsg; }; STDMETHODIMP TmyASOImpl::DoError(const AnsiString& Msg) { FLastErrorMsg = Msg; return Error(Msg.c_str(), IID_ImyASO); } STDMETHODIMP TmyASOImpl::get_LastErrorMsg(BSTR *Value) { try { *Value = WideString(FLastErrorMsg).Detach(); } catch(const Exception &e) { return Error(e.Message.c_str(), IID_ImyASO); } return S_OK; } STDMETHODIMP TmyASOImpl::myMethod(int x) { try { if(x > 100) throw Exception("x is higher than 100"); } catch(const Exception &e) { return DoError(e.Message); } return S_OK; } Gambit Back to top Marcel Guest Posted: Sat Sep 25, 2004 7:31 pm    Post subject: Re: Exception handling "Remy Lebeau (TeamB)" <no.spam (AT) no (DOT) spam.com> wrote Quote: "Marcel" <sorryafraidofspam (AT) nospam (DOT) com> wrote in message news:4153edd4$1 (AT) newsgroups (DOT) borland.com... Ok thanks Gambit, so your LastErrorMsg property contains the last errormessage? I.e.?: That is not how I implement it. I replace calls to Error() with calls to a custom method that records the error message into a member variable of the class, then the property simply returns that value. class TmyASOImpl { private: AnsiString FLastErrorMsg; }; STDMETHODIMP TmyASOImpl::DoError(const AnsiString& Msg) { FLastErrorMsg = Msg; return Error(Msg.c_str(), IID_ImyASO); } STDMETHODIMP TmyASOImpl::get_LastErrorMsg(BSTR *Value) { try { *Value = WideString(FLastErrorMsg).Detach(); } catch(const Exception &e) { return Error(e.Message.c_str(), IID_ImyASO); } return S_OK; } STDMETHODIMP TmyASOImpl::myMethod(int x) { try { if(x > 100) throw Exception("x is higher than 100"); } catch(const Exception &e) { return DoError(e.Message); } return S_OK; } Gambit Ok Gambit, thanks a lot for your help again! So this way sense-making error messages can be displayed in the users browser? Marcel Back to top Remy Lebeau (TeamB) Guest Posted: Sun Sep 26, 2004 11:09 am    Post subject: Re: Exception handling "Marcel" <info (AT) xxxremovethisxxxmediaquest (DOT) nl> wrote Quote: Ok Gambit, thanks a lot for your help again! So this way sense-making error messages can be displayed in the users browser? Not in the standard fashion, no. You would have to display it manually, ie: On Error Resume Next //... myASO.myMethod 150 If Err.Number <> 0 then Response.Write "An Error Occured: " & myASO.LastErrorMsg End If If you support ISupportErrorInfo and IErrorInfo, then the ASP code should be able to recognize and handle the error automatically. 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