BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Referencing a component from a component          BorlandTalk.com Forum Index -> C++ Builder (VCL Components Development) View previous topic :: View next topic   Author Message John Guest Posted: Fri Jul 02, 2004 7:05 pm    Post subject: Referencing a component from a component I've looked around the various newsgroups and haven't found an answer to this yet, so hopefully, I can get some help here. I have two components, we'll call them CompA and CompB. Now these two components both rely on a third component for their operation and we'll call this SupportC. If I install SupportC, then I can't install either CompA or CompB as they both flag an error during the install process indicating that SupportC already exists. So I remove SupportC and can install CompA or CompB but not both, as when one is installed it will also install SupportC and then the other component fails to install because it flags an error to indicate that SupportC already exists. I'm at a loss here. I know I should be able to do this, but some reason I can't. Any suggestions on this would be greatly appreciated. Thanks Back to top Gerhard Müller Guest Posted: Mon Jul 05, 2004 10:14 am    Post subject: Re: Referencing a component from a component Hi John, probably you try to register the "SupportC" component more then once. A component will be registered with the function "RegisterComponents". Usually this function is called inside another function named "Register" at the end of the source code of the component. If you try to register the same component twice, e.g. inside the source file "SupportC" and also inside "CompA", such an error like you descripted may occur. The fact that you are able to install "CompA" without having installed "SupportC" before tells me that my assumption could be right. Especially because the attempt to install "CompB" after "CompA" also failed since "CompB" tries also to register "SupportC". I suggest to remove that part of souce code inside "CompA" and "CompB" which registers the component "SupportC". Inside "CompA" should only the component "CompA" be registered, inside "CompB" only the component "CompB" and so on...... How ever, if this is not the reason for your problem, you should announce an example of your source code. Then it will be easier to find a solution for your problem. Best regards Gerhard "John" <john (AT) nospam (DOT) com> schrieb im Newsbeitrag news:<40e5b187$1 (AT) newsgroups (DOT) borland.com>... Quote: I've looked around the various newsgroups and haven't found an answer to this yet, so hopefully, I can get some help here. I have two components, we'll call them CompA and CompB. Now these two components both rely on a third component for their operation and we'll call this SupportC. If I install SupportC, then I can't install either CompA or CompB as they both flag an error during the install process indicating that SupportC already exists. So I remove SupportC and can install CompA or CompB but not both, as when one is installed it will also install SupportC and then the other component fails to install because it flags an error to indicate that SupportC already exists. I'm at a loss here. I know I should be able to do this, but some reason I can't. Any suggestions on this would be greatly appreciated. Thanks "John" <john (AT) nospam (DOT) com> schrieb im Newsbeitrag news:40e5b187$1 (AT) newsgroups (DOT) borland.com... Quote: I've looked around the various newsgroups and haven't found an answer to this yet, so hopefully, I can get some help here. I have two components, we'll call them CompA and CompB. Now these two components both rely on a third component for their operation and we'll call this SupportC. If I install SupportC, then I can't install either CompA or CompB as they both flag an error during the install process indicating that SupportC already exists. So I remove SupportC and can install CompA or CompB but not both, as when one is installed it will also install SupportC and then the other component fails to install because it flags an error to indicate that SupportC already exists. I'm at a loss here. I know I should be able to do this, but some reason I can't. Any suggestions on this would be greatly appreciated. Thanks Back to top John Guest Posted: Mon Jul 19, 2004 12:38 pm    Post subject: Re: Referencing a component from a component Thanks Gerhard, it turned out that there was some lingering library pointers inside the .bpk file. I opened up the file with a text editor, cleaned it up and that fixed the problem. I'm getting a little annoyed at how frequently I find myself modifying the bpk or bpr files with a text editor. John -- "Gerhard Müller" <gerhard.mueller (AT) dlr (DOT) de> wrote Quote: Hi John, probably you try to register the "SupportC" component more then once. A component will be registered with the function "RegisterComponents". Usually this function is called inside another function named "Register" at the end of the source code of the component. If you try to register the same component twice, e.g. inside the source file "SupportC" and also inside "CompA", such an error like you descripted may occur. The fact that you are able to install "CompA" without having installed "SupportC" before tells me that my assumption could be right. Especially because the attempt to install "CompB" after "CompA" also failed since "CompB" tries also to register "SupportC". I suggest to remove that part of souce code inside "CompA" and "CompB" which registers the component "SupportC". Inside "CompA" should only the component "CompA" be registered, inside "CompB" only the component "CompB" and so on...... How ever, if this is not the reason for your problem, you should announce an example of your source code. Then it will be easier to find a solution for your problem. Best regards Gerhard "John" <john (AT) nospam (DOT) com> schrieb im Newsbeitrag news:<40e5b187$1 (AT) newsgroups (DOT) borland.com>... I've looked around the various newsgroups and haven't found an answer to this yet, so hopefully, I can get some help here. I have two components, we'll call them CompA and CompB. Now these two components both rely on a third component for their operation and we'll call this SupportC. If I install SupportC, then I can't install either CompA or CompB as they both flag an error during the install process indicating that SupportC already exists. So I remove SupportC and can install CompA or CompB but not both, as when one is installed it will also install SupportC and then the other component fails to install because it flags an error to indicate that SupportC already exists. I'm at a loss here. I know I should be able to do this, but some reason I can't. Any suggestions on this would be greatly appreciated. Thanks "John" <john (AT) nospam (DOT) com> schrieb im Newsbeitrag news:40e5b187$1 (AT) newsgroups (DOT) borland.com... I've looked around the various newsgroups and haven't found an answer to this yet, so hopefully, I can get some help here. I have two components, we'll call them CompA and CompB. Now these two components both rely on a third component for their operation and we'll call this SupportC. If I install SupportC, then I can't install either CompA or CompB as they both flag an error during the install process indicating that SupportC already exists. So I remove SupportC and can install CompA or CompB but not both, as when one is installed it will also install SupportC and then the other component fails to install because it flags an error to indicate that SupportC already exists. I'm at a loss here. I know I should be able to do this, but some reason I can't. Any suggestions on this would be greatly appreciated. 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