BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Re: AV loading graphic in component          BorlandTalk.com Forum Index -> C++ Builder (VCL Components Development) View previous topic :: View next topic   Author Message Remy Lebeau (TeamB) Guest Posted: Sat Feb 07, 2004 1:38 am    Post subject: Re: AV loading graphic in component "Asger Jørgensen" <Asger.Pnotthis (AT) AJ-World (DOT) dk> wrote Quote: BmpLight->LoadFromResourceID((int)HInstance,ID_BMP_LIGHT); ----->>>>>>>ERROR AV read of address You should not be using the global HInstance variable when working with component packages. You must use then FindClassHInstance() function instead: BmpLight->LoadFromResourceID(FindClassHInstance(__classid(TWhateverYourClass Is)), ID_BMP_LIGHT); The global HInstance refers to the application's module, whereas you stored the bitmaps in your own package's module instead. Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Sat Feb 07, 2004 2:55 am    Post subject: Re: AV loading graphic in component "Asger Jørgensen" <Asger.Pnotthis (AT) AJ-World (DOT) dk> wrote Quote: BmpLight = new Graphics::TBitmap; BmpLight->LoadFromResourceID( FindClassHInstance(__classid(TAJInput7053)),ID_BMP_LIGHT); Still gets the AV unless i add the res file to the App project There is nothing in that code you have shown that can through an AV to begin with. An EResNotFound exception maybe, but not an AV. Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Sun Feb 08, 2004 12:27 am    Post subject: Re: AV loading graphic in component "Asger Jørgensen" <Asger.Pnotthis (AT) AJ-World (DOT) dk> wrote Quote: i have done a trace into on the load resource call and this is where it went: I cannot comment on that. Nothing you have described is making any sense. Please show your actual code, I'll bet you the AV is actually occuring somewhere completely different then you expect it to be. Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Mon Feb 09, 2004 3:22 am    Post subject: Re: AV loading graphic in component "Asger Jørgensen" <Asger.Pnotthis (AT) AJ-World (DOT) dk> wrote Quote: static Graphics::TBitmap* BmpLight; static Graphics::TBitmap* BmpDark; Why are you using static instances instead of local members? If you change your code to not use static instances, I'll bet you the AV goes away. Gambit Back to top OBones Guest Posted: Mon Feb 09, 2004 7:33 am    Post subject: Re: AV loading graphic in component Asger Jørgensen wrote: Quote: No, that don't help either the av is still there, that is if the image.res isn't added to the app project. And why shouldn't it bee, it is just the pointer there is static, not the load from resources stuff, and isn't it so that static members are created before any instances ? So they should be valid before i use them, which i also think they are, after all the av doesn't happen in the first line where i use the pointer with new, it happen when i try to load the bitmap from the resource. I haven't read the whole thread so I may say something that has already been said. The fact that the AV occurs when you try to load the bitmap from the resources leads me to believe that the resource is not linked into the executable and that the loading code cannot find it, thus indirectly leading to the AV. There might be a solution in this area... Back to top Remy Lebeau (TeamB) Guest Posted: Mon Feb 09, 2004 7:37 pm    Post subject: Re: AV loading graphic in component "OBones" <obones_fff_ (AT) meloo_fdf_ (DOT) com> wrote Quote: The fact that the AV occurs when you try to load the bitmap from the resources leads me to believe that the resource is not linked into the executable and that the loading code cannot find it, thus indirectly leading to the AV. If that were the case, he would be getting an EResNotFound exception, not an Access Violation. The fact that he is getting an Access Violation means that either 1) his TBitmap pointers are messed up to begin with, thus he wold be accessing invalid pointers, or 2) the image data is found in the resources correctly but the resource data itself is corrupted, thus TBitmap would crash on trying to parse invalid bitmap data. Gambit Back to top OBones Guest Posted: Mon Feb 09, 2004 11:12 pm    Post subject: Re: AV loading graphic in component Remy Lebeau (TeamB) wrote: Quote: If that were the case, he would be getting an EResNotFound exception, not an Access Violation. The fact that he is getting an Access Violation means that either 1) his TBitmap pointers are messed up to begin with, thus he wold be accessing invalid pointers, or 2) the image data is found in the resources correctly but the resource data itself is corrupted, thus TBitmap would crash on trying to parse invalid bitmap data. I'm no expert here, but I quite agree with your analysis and would go for the second option. As Asger said, the component is working in design mode, but not in run mode. This makes me think that he is not using runtime packages for his project. That means that in design time the bpi file is used, thus having the correct resources. But in run time, only the complete lib file is used, thus not having any of the component's resources linked. But by an incredible misfortune, it seems he has a resource in his exe that has the same ID, but is not a bitmap, thus leading to the AV. That's where I would have a look anyway, at the way resources are loaded: by numerical or string ID. If it's string, then he should get the EResNotFound, but if it's numerical, there is a chance that a resouce by that number already exists... Back to top OBones Guest Posted: Tue Feb 10, 2004 12:17 am    Post subject: Re: AV loading graphic in component Asger Jørgensen wrote: Quote: There is a checkmark in Designtime and Runtime, isn't that where it should be ? Uh... In the package properties ? Then this is already a problem. Packages should be either runtime or design time, but not both, and it has been like that since version 5 at least (maybe even 4). For instance: MyPackageR.bpk (a runtime only package) contains the source files for your component (cpp or pas, inc, res), but nothing related to design time (no editors, no registration...) MyPackageD.bpk (a designtime only package) contains the registration unit and maybe the editors unit. It requires MyPackageR.bpi Then you only install MyPackageD.bpl in the IDE and you can use your component. Try having something like that and tell us if the problem is still there. Back to top Remy Lebeau (TeamB) Guest Posted: Tue Feb 10, 2004 1:08 am    Post subject: Re: AV loading graphic in component "OBones" <obones_fff_ (AT) meloo_fdf_ (DOT) com> wrote Quote: But by an incredible misfortune, it seems he has a resource in his exe that has the same ID, but is not a bitmap, thus leading to the AV. snip if it's numerical, there is a chance that a resouce by that number already exists... Since he did not actually show what his numeric values are, or how he is creating the resource in the first place, then I agree that it is a distinct possibility. 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