BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Regarding creating a custom EOleException          BorlandTalk.com Forum Index -> Delphi OLE Automation View previous topic :: View next topic   Author Message Philip Guest Posted: Mon Apr 25, 2005 3:32 pm    Post subject: Regarding creating a custom EOleException Hi All, I have created a COM business object library in Delphi 7 and created a custom exception deriving from EOleException for this library. Whenever I catch this Exception from other applications, it is coming as EOleException type only. Is there something else I have to do for this? Thanks in advance Back to top Dmitry Streblechenko Guest Posted: Mon Apr 25, 2005 6:11 pm    Post subject: Re: Regarding creating a custom EOleException When an exception is raised inside of a safecall method, Delphi RTL catches it and converts it to an appropriate HResult return code. Real exceptions are never ever propagated accross COM calls, especially out-of-proc. Every IDispatch-friendly COM call must return an HResult (which is just an int) and Delphi makes sure this happens.Plus you cannot use "is" and "as" operators accross executable boundaries, either in-proc or out-of-proc, so you type casting won't work. Try to use custom error codes instead. Dmitry Streblechenko (MVP) http://www.dimastr.com/ OutlookSpy - Outlook, CDO and MAPI Developer Tool "Philip" <philjo (AT) gmail (DOT) com> wrote Quote: Hi All, I have created a COM business object library in Delphi 7 and created a custom exception deriving from EOleException for this library. Whenever I catch this Exception from other applications, it is coming as EOleException type only. Is there something else I have to do for this? Thanks in advance Back to top George Birbilis Guest Posted: Tue Apr 26, 2005 10:30 am    Post subject: Re: Regarding creating a custom EOleException Quote: Plus you cannot use "is" and "as" operators accross executable boundaries, either in-proc or out-of-proc, so you type casting won't work. you mean you can't also use QueryInterface? I always thought "as" was using that, but after some bad experiences with "as" I tend to think otherwise -- ----- George Birbilis (birbilis (AT) kagi (DOT) com) Microsoft Most Valuable Professional MVP J# for 2004 & 2005 http://www.kagi.com/birbilis -------------- Back to top Dmitry Streblechenko Guest Posted: Wed Apr 27, 2005 8:44 pm    Post subject: Re: Regarding creating a custom EOleException No, QueryInterface works just fine. "Is" and "as" under the hood compare the pointers to the RTTI info tables, which will be different if the same class is compiled into 2 executables (e.g. exe and dll). Dmitry Streblechenko (MVP) http://www.dimastr.com/ OutlookSpy - Outlook, CDO and MAPI Developer Tool "George Birbilis" <birbilis (AT) kagi (DOT) com> wrote Quote: Plus you cannot use "is" and "as" operators accross executable boundaries, either in-proc or out-of-proc, so you type casting won't work. you mean you can't also use QueryInterface? I always thought "as" was using that, but after some bad experiences with "as" I tend to think otherwise -- ----- George Birbilis (birbilis (AT) kagi (DOT) com) Microsoft Most Valuable Professional MVP J# for 2004 & 2005 http://www.kagi.com/birbilis -------------- Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> Delphi OLE Automation All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.