BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  cannot fond the object when ComponentState is csDesigning,cs          BorlandTalk.com Forum Index -> C++ Builder (VCL Components Development) View previous topic :: View next topic   Author Message Emmanuel Guest Posted: Wed Jan 03, 2007 8:58 am    Post subject: cannot fond the object when ComponentState is csDesigning,cs I have write a component,say C1. one of the property,say p1, is link to a TComponent,say C2, which is owner by other TForm ,say FormA, I find that when the ComponentState is csDesigning, and the FormA have not open, the C1->p1 will set to be NULL eventhough C1->p1=FormA->C2 in the dfm file. How can I solve it? __published: __property TERPRemoteServer*RemoteServerLink={read=FRemoteServerLink,write=SetLinkRemoteServer}; void __fastcall TERPRemoteServer::SetLinkRemoteServer(TERPRemoteServer*Value) {if(Value==this) {return; } //for test only Application->MessageBox(((AnsiString)(int)Value).c_str(),"FRemoteServerLink",MB_OK); if(Value!=NULL) {Application->MessageBox(Value->Name.c_str(),"FRemoteServerLink->Name",MB_OK); }....}it will Claim Value = NULLApplication->MessageBox("0","FRemoteServerLink",MB_OK);in fact, it is not NULL in dfm fileHow can I solve it? Back to top Remy Lebeau (TeamB) Guest Posted: Wed Jan 03, 2007 9:11 am    Post subject: Re: cannot fond the object when ComponentState is csDesignin "Emmanuel" <emmanuel (AT) erphk (DOT) com> wrote in message news:459b1b27 (AT) newsgroups (DOT) borland.com... Quote: I have write a component,say C1. one of the property,say p1, is link to a TComponent,say C2, which is owner by other TForm ,say FormA, I find that when the ComponentState is csDesigning, and the FormA have not open, the C1->p1 will set to be NULL eventhough C1->p1=FormA->C2 in the dfm file. As it should be, as FormA has not been loaded yet, and the reference to C2 has not been resolved yet.. Quote: How can I solve it? There is nothing to solve. The streaming is doing exactly what it is supposed to be doing. You are simply trying to access the external component too soon. The SetLinkRemoteServer() method will be triggered immediately when the DFM is streamed. But if FormA hasn't been loaded yet, it cannot pass a valid component pointer to SetLinkRemoteServer(), so you get NULL. You have to wait until your component's Loaded() method has been called before the reference will be valid. For example: private: TERPRemoteServer* FRemoteServerLink; protected: virtual void __fastcall Loaded(); __published: __property TERPRemoteServer* RemoteServerLink = {read=FRemoteServerLink, write=SetLinkRemoteServer}; void __fastcall TERPRemoteServer::Loaded() { YourBaseComponent::Loaded(); Application->MessageBox(IntToStr(Value).c_str(), "Loaded: FRemoteServerLink", MB_OK); if( FRemoteServerLink ) Application->MessageBox(FRemoteServerLink->Name.c_str(), "Loaded: FRemoteServerLink->Name", MB_OK); } void __fastcall TERPRemoteServer::SetLinkRemoteServer(TERPRemoteServer*Value) { if( FRemoteServerLink != Value ) { FRemoteServerLink = Value; Application->MessageBox(IntToStr(Value).c_str(), "Set: FRemoteServerLink", MB_OK); if( FRemoteServerLink ) Application->MessageBox(FRemoteServerLink->Name.c_str(), "Set: FRemoteServerLink->Name", MB_OK); } } The DFM streaming code maintains a list of cross references that it has to resolve after all components have been created. So SetLinkRemoteServer() may get called more than once during the streaming of your component. Gambit Back to top Emmanuel Guest Posted: Mon Jan 08, 2007 9:43 pm    Post subject: Re: cannot fond the object when ComponentState is csDesignin No Solution? Back to top Remy Lebeau (TeamB) Guest Posted: Wed Jan 10, 2007 2:00 am    Post subject: Re: cannot fond the object when ComponentState is csDesignin "Emmanuel" <emmanuel (AT) erphk (DOT) com> wrote in message news:45a265e1 (AT) newsgroups (DOT) borland.com... Quote: No Solution? I already gave you an answer a week ago. 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