BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Pointer type in type library editor          BorlandTalk.com Forum Index -> Delphi ActiveX Controls Development View previous topic :: View next topic   Author Message Guest Posted: Thu Aug 21, 2003 4:47 pm    Post subject: Pointer type in type library editor Hi, all, How can I declare a parameter or function return type to be a Pointer type in a type library editor? There is no Pointer type available to select in both Pascal and IDL. But I know the Pointer type has been using in ActiveX.pas as follow: function CoInitialize(pvReserved: Pointer): HResult; stdcall; and in OLE Automation (Version 2.0), file name "stdole2.tlb" as follow: IPicture = interface(IUnknown) ... function SaveAsFile(var pstm: Pointer; fSaveMemCopy: WordBool; out pcbSize: Integer): hResult; stdcall; ... end; Appreciated for any help, Chiumen Back to top Maynard Philbrook Guest Posted: Thu Aug 21, 2003 5:02 pm    Post subject: Re: Pointer type in type library editor i am not sure if this is what you want but the VAR operator in the parameters signifies that the value be passed via reference which means the compiler passes a pointer address to the object from the caller. this means that you can modify the callers info. an object with out the VAR simply gets a copy of its contents placed on the stack and this does not effect the original unless the object is already of type pointer that points to a known type., types like this could be a Pchar, or memory pointer directly.., since these items are 4 byte pointers to start with they are simply pushed onto the stack as a Dword with the pointers value.. Chiumen wrote: Quote: Hi, all, How can I declare a parameter or function return type to be a Pointer type in a type library editor? There is no Pointer type available to select in both Pascal and IDL. But I know the Pointer type has been using in ActiveX.pas as follow: function CoInitialize(pvReserved: Pointer): HResult; stdcall; and in OLE Automation (Version 2.0), file name "stdole2.tlb" as follow: IPicture = interface(IUnknown) ... function SaveAsFile(var pstm: Pointer; fSaveMemCopy: WordBool; out pcbSize: Integer): hResult; stdcall; ... end; Appreciated for any help, Chiumen -- To See what real programmers do in their spare time visit http://jamie12.home.mindspring.com home of PC bit software .. Please send comments about my work . Back to top Guest Posted: Thu Aug 21, 2003 10:36 pm    Post subject: Re: Pointer type in type library editor Thanks for the reply, Michael, I just try to use the untyped Pointer or any user-defined types in the type library editor, something like: procedure Method1(Param1: Pointer); safecall; Chiumen "Michael Kelly" <mkelly2002 (AT) adelphia (DOT) net> wrote Quote: On Thu, 21 Aug 2003 09:47:07 -0700, <Chiumen> wrote: Hi, all, How can I declare a parameter or function return type to be a Pointer type in a type library editor? There is no Pointer type available to select in both Pascal and IDL. What exactly are you trying to do? The reason there isn't a plain pointer type for use in the type library editor is because then there would be no type information. COM has to deal with data types across process and/or machine boundaries(see Marshalling) so if it doesn't know the type, it doesn't know how to deal with it. If you want to pass buffers of raw data you may be able to use a BSTR since it doesn't determine length by encountering a NULL char. The best site I've found to get started in Delphi COM is www.techvanguards.com Also you might try www.delphi3000.com www.mers.com or let us know more and maybe someone here can contribute suggestions. -- "I don't want to belong to any club that would have me as a member." -- Groucho Marx Back to top Michael Kelly Guest Posted: Fri Aug 22, 2003 11:22 pm    Post subject: Re: Pointer type in type library editor On Thu, 21 Aug 2003 15:36:49 -0700, <Chiumen> wrote: Quote: Thanks for the reply, Michael, I just try to use the untyped Pointer or any user-defined types in the type library editor, something like: procedure Method1(Param1: Pointer); safecall; Hi. I got that the first time. The point is, in COM nothing is usually that straight forward as it is in regular programming. To avoid lots of headaches it's probably best to get 3 or 4 books on COM programming and really read them through. The terminology is much too confusing to explain much in a couple of paragraphs on a ng. Don Box is very good if you understand C++. There are a few books around with some Delphi COM stuff but most of them are for C++. -- "I don't want to belong to any club that would have me as a member." -- Groucho Marx Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> Delphi ActiveX Controls Development 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.