BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  unresolved external          BorlandTalk.com Forum Index -> C++ Builder (VCL Components Development) View previous topic :: View next topic   Author Message JD Guest Posted: Sat Feb 14, 2004 1:46 pm    Post subject: unresolved external I've subclassed the TInplaceEditList and I'm getting a linker error: [Linker Error] Unresolved external '__fastcall Grids::TInplaceEditList::PaintWindow(void *)' referenced from C:...TESTTFEDITOR.OBJ I haven't done anything to touch PaintWindow. What gives? Notice that the error reads 'PaintWindow(void *)' and the source (TInplaceEditList) reads 'PaintWindow(DC: HDC)'. ~ JD Back to top OBones Guest Posted: Sun Feb 15, 2004 11:43 pm    Post subject: Re: unresolved external JD wrote: Quote: I've subclassed the TInplaceEditList and I'm getting a linker error: [Linker Error] Unresolved external '__fastcall Grids::TInplaceEditList::PaintWindow(void *)' referenced from C:...TESTTFEDITOR.OBJ I haven't done anything to touch PaintWindow. What gives? Notice that the error reads 'PaintWindow(void *)' and the source (TInplaceEditList) reads 'PaintWindow(DC: HDC)'. ~ JD That comes from an error in the generation of the header files from pascal files. Unfortunately, you can't do much about it using only C++ code. One solution would be to write your component directly in Delphi Pascal Object. Back to top JD Guest Posted: Mon Feb 16, 2004 5:48 am    Post subject: Re: unresolved external OBones <obones_fff_ (AT) meloo_fdf_ (DOT) com> wrote: Quote: JD wrote: I've subclassed the TInplaceEditList and I'm getting a linker error: [Linker Error] Unresolved external '__fastcall Grids::TInplaceEditList::PaintWindow(void *)' referenced from C:...TESTTFEDITOR.OBJ I haven't done anything to touch PaintWindow. What gives? Notice that the error reads 'PaintWindow(void *)' and the source (TInplaceEditList) reads 'PaintWindow(DC: HDC)'. ~ JD That comes from an error in the generation of the header files from pascal files. How can I verify this? I found several posts where others have subclassed the TInPlaceEdit using TInPlaceEditList and no reports of my problem. Quote: One solution would be to write your component directly in Delphi Pascal Object. Well Pascal was the first language that I ever learned so I can work with it but I've never had a need to use Delphi in CBuilder. I'll consider it only as a last resort. ~ JD Back to top OBones Guest Posted: Mon Feb 16, 2004 6:21 am    Post subject: Re: unresolved external JD wrote: Quote: OBones <obones_fff_ (AT) meloo_fdf_ (DOT) com> wrote: JD wrote: I've subclassed the TInplaceEditList and I'm getting a linker error: [Linker Error] Unresolved external '__fastcall Grids::TInplaceEditList::PaintWindow(void *)' referenced from C:...TESTTFEDITOR.OBJ I haven't done anything to touch PaintWindow. What gives? Notice that the error reads 'PaintWindow(void *)' and the source (TInplaceEditList) reads 'PaintWindow(DC: HDC)'. ~ JD That comes from an error in the generation of the header files from pascal files. How can I verify this? I found several posts where others have subclassed the TInPlaceEdit using TInPlaceEditList and no reports of my problem. That is certainly true, but did any of them override the PainWindow method? If yes, then they should have had the same problem as you. To verify the problem, find the hpp file where PaintWindow is declared (I'd say Grids.hpp) and look at the definition of the first parameter. If I'm correct, it should be a void* (or something that resolves to a void*) Now, if you open Grids.pas in the source directory, you'll see that PaintWindow has a first parameter of type HDC. The hpp file is generated from the pas file and you shouldn't modify it under any circumstance. It seems that HDC is output as a void* by the hpp generator, while HDC actually simply is a long (32 bits) and is output as such in the obj file. Thus the problem you get. One solution may be to edit the hpp file and replace void* by long, but I don't recommend doing this as this change will have to be done on every installation of C++ Builder. Another solution, a bit dirty, but more portable, would be to declare your own TInplaceEditList class in a separate header file. This declaration would be a complete copy of the one in Grids.hpp, but would include the correction. You would have to include your own file instead of grids.hpp but still use #pragma link "grids". This is the way I would explore anyway. Quote: Well Pascal was the first language that I ever learned so I can work with it but I've never had a need to use Delphi in CBuilder. I'll consider it only as a last resort. And you should, I quite agree on that. Back to top JD Guest Posted: Mon Feb 16, 2004 7:34 am    Post subject: Re: unresolved external OBones <obones_fff_ (AT) meloo_fdf_ (DOT) com> wrote: Quote: That is certainly true, but did any of them override the PainWindow method? If yes, then they should have had the same problem as you. But I didn't override PaintWindow. That's what's so confusing. Quote: [...] it should be a void* (or something that resolves to a void*) Now, if you open Grids.pas in the source directory, you'll see that PaintWindow has a first parameter of type HDC. This is correct. However, HDC is a typedef for void* which means that PaintWindow(HDC) and PaintWindow(void*) are identical as far as the compiler is concerned. I was able to get it to compile by overriding the PaintWindow(HDC): void __fastcall TMyInPlaceEditList::PaintWindow(HDC DC) { inherited::PaintWindow(DC); } Everything seems to be ok now but I have so much code commented out that it's too early to tell. Thanks for your time. ~ JD Back to top OBones Guest Posted: Mon Feb 16, 2004 10:58 pm    Post subject: Re: unresolved external JD wrote: Quote: I was able to get it to compile by overriding the PaintWindow(HDC): void __fastcall TMyInPlaceEditList::PaintWindow(HDC DC) { inherited::PaintWindow(DC); } Everything seems to be ok now but I have so much code commented out that it's too early to tell. Thanks for your time. No worries Back to top Craig Farrell Guest Posted: Wed Feb 18, 2004 3:17 am    Post subject: Re: unresolved external Hi, Quote: I was able to get it to compile by overriding the PaintWindow(HDC): void __fastcall TMyInPlaceEditList::PaintWindow(HDC DC) { inherited::PaintWindow(DC); } Everything seems to be ok now but I have so much code commented out that it's too early to tell. Thanks for your time. Pascal HDC and HWND parameters can be problematic on the C++ side due to STRICT. I'm not sure what you changed but, for reference, I think that another resolution would be to change the HDC to unsigned in the dcc32 generated header. --Craig Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> C++ Builder (VCL Components 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.