How do I remove a function in ATL ?
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I know exactly what you mean, the same ting happens if you make a spelling error in a function name, and try ro rename the function :( I have done it by doing a search/replace in all the files in the project, and then rebuilt the project... - Anders Money talks, but all mine ever says is "Goodbye!"
The problem seems to be that while that would work for a rename, if you go through and *delete* a function, because of the way it's all laid out, any functions you add after it won't get found in the vtable, so I end up with NULL pointers when trying to create them. Christian As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet. Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
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The problem seems to be that while that would work for a rename, if you go through and *delete* a function, because of the way it's all laid out, any functions you add after it won't get found in the vtable, so I end up with NULL pointers when trying to create them. Christian As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet. Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
Wow, I have been working with ATL for 4+ years and have never had any problem like that. Well, other than sometimes the compiler not rebuilding everything. Rebuild all fixes that. I did have one problem one time, but it turned out that I named an H file with the same name as a system file (i.e. version.h), thus the compiler would always ignore changes to that file as far as requiring rebuilds. Tim Smith Descartes Systems Sciences, Inc.
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Wow, I have been working with ATL for 4+ years and have never had any problem like that. Well, other than sometimes the compiler not rebuilding everything. Rebuild all fixes that. I did have one problem one time, but it turned out that I named an H file with the same name as a system file (i.e. version.h), thus the compiler would always ignore changes to that file as far as requiring rebuilds. Tim Smith Descartes Systems Sciences, Inc.
I did have one problem one time, but it turned out that I named an H file with the same name as a system file (i.e. version.h), thus the compiler would always ignore changes to that file as far as requiring rebuilds. Sounds like the debugging problem from hell !! I've got a feeling when I go through and delete every piece of code with the name of my function, some of the funky looking stuff I delete should be left or changed, I'm just not sure what. Christian As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet. Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
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I did have one problem one time, but it turned out that I named an H file with the same name as a system file (i.e. version.h), thus the compiler would always ignore changes to that file as far as requiring rebuilds. Sounds like the debugging problem from hell !! I've got a feeling when I go through and delete every piece of code with the name of my function, some of the funky looking stuff I delete should be left or changed, I'm just not sure what. Christian As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet. Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
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Is this in conjunction with the class wizard? If so, that could explain why I have never seen any type of problem like that. I have always been too bullheaded and lazy to learn those classwizards. :) Tim Smith Descartes Systems Sciences, Inc.
The classwizard does not support removing functions, although I used it to add them ( well it's not the classwizard, but I assume you mean the class view ). Christian As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet. Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
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The classwizard does not support removing functions, although I used it to add them ( well it's not the classwizard, but I assume you mean the class view ). Christian As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet. Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
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I have an ATL project that started as a learning project but has come to a point of having code I would like to use. The problem is that on the way I created some functions I want to remove, but doing so breaks everything, in the least it stops mew adding more methods. Can anyone tell me how I'm supposed to do this ? Each function seems to have residue all over the place... Christian As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet. Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
Hi Christian, Sorry if this sounds like a really stupid question, but do you mean exported COM methods? Have you deleted them from the IDL and renumbered all of your IDL functions? For example:
[id(1), helpstring("method ExecuteSql")] HRESULT ExecuteSql([in] VARIANT avCommand, [out] VARIANT *apvResponse);
[id(2), helpstring("method ExecuteDml")] HRESULT ExecuteDml([in] VARIANT avCommand, [out] VARIANT *apvResponse);
[id(3), helpstring("method GetStatus")] HRESULT GetStatus([out] long *aplStatus);Then, trying to delete ExecuteDML, you would need:
[id(1), helpstring("method ExecuteSql")] HRESULT ExecuteSql([in] VARIANT avCommand, [out] VARIANT *apvResponse);
[id(2), helpstring("method GetStatus")] HRESULT GetStatus([out] long *aplStatus);remembering to renumber the method to 2. All of this is in addition to removing the functions from the .h and .cpp files associated with the IDL. Again, sorry if this seems obvious, but my experience has always shown that it's the obvious things you miss... Hope this helps. ------------------------ Derek Waters derek@lj-oz.com
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Hi Christian, Sorry if this sounds like a really stupid question, but do you mean exported COM methods? Have you deleted them from the IDL and renumbered all of your IDL functions? For example:
[id(1), helpstring("method ExecuteSql")] HRESULT ExecuteSql([in] VARIANT avCommand, [out] VARIANT *apvResponse);
[id(2), helpstring("method ExecuteDml")] HRESULT ExecuteDml([in] VARIANT avCommand, [out] VARIANT *apvResponse);
[id(3), helpstring("method GetStatus")] HRESULT GetStatus([out] long *aplStatus);Then, trying to delete ExecuteDML, you would need:
[id(1), helpstring("method ExecuteSql")] HRESULT ExecuteSql([in] VARIANT avCommand, [out] VARIANT *apvResponse);
[id(2), helpstring("method GetStatus")] HRESULT GetStatus([out] long *aplStatus);remembering to renumber the method to 2. All of this is in addition to removing the functions from the .h and .cpp files associated with the IDL. Again, sorry if this seems obvious, but my experience has always shown that it's the obvious things you miss... Hope this helps. ------------------------ Derek Waters derek@lj-oz.com
To be honest, it's my recollection that I expected to have to do that but couldn't find where it was. I also deleted the weird lookin' stuff that was associated with my function and looked to me like it was specifying offsets in memory for functions & variables, is that right ? Thanks for the help. Christian As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet. Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
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To be honest, it's my recollection that I expected to have to do that but couldn't find where it was. I also deleted the weird lookin' stuff that was associated with my function and looked to me like it was specifying offsets in memory for functions & variables, is that right ? Thanks for the help. Christian As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet. Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
Yeah, the IDL is contained in the .dil file in your interface definition. Having a quick look at the example project I was using, the only line I would have removed from the .h file was:
STDMETHOD(ExecuteDml)(/*[in]*/ VARIANT avCommand, /*[out]*/ VARIANT *apvResponse);
and also the corresponding implementation in .cpp. I think that's about it. You will, though, have to make sure that the MIDL compiler regenerates the main project .h file which contains the stubs that wrap around the COM calls. If you've screwed around with this file, I'd try deleting it, modifying your IDL so the MIDL compiler fires off again and regenerating. The id numbers in the IDL specify the function offsets in the COM object. These definitely have to be sequentially increasing. Any missing or mis-ordered numbers cause things to go very askew (as I've found out from experience). ------------------------ Derek Waters derek@lj-oz.com
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Yeah, the IDL is contained in the .dil file in your interface definition. Having a quick look at the example project I was using, the only line I would have removed from the .h file was:
STDMETHOD(ExecuteDml)(/*[in]*/ VARIANT avCommand, /*[out]*/ VARIANT *apvResponse);
and also the corresponding implementation in .cpp. I think that's about it. You will, though, have to make sure that the MIDL compiler regenerates the main project .h file which contains the stubs that wrap around the COM calls. If you've screwed around with this file, I'd try deleting it, modifying your IDL so the MIDL compiler fires off again and regenerating. The id numbers in the IDL specify the function offsets in the COM object. These definitely have to be sequentially increasing. Any missing or mis-ordered numbers cause things to go very askew (as I've found out from experience). ------------------------ Derek Waters derek@lj-oz.com
Ah.... *light comes on* So if I remove the .h and .cpp references to the fucntion, and the IDL reference which has the number, the compiler will fix the rest ? Christian As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet. Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
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Ah.... *light comes on* So if I remove the .h and .cpp references to the fucntion, and the IDL reference which has the number, the compiler will fix the rest ? Christian As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet. Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
Yep. At least, that is my belief, without wanting to 100%, no doubt, absolutely stake my life on the behaviour of Visual C++... ------------------------ Derek Waters derek@lj-oz.com
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Yep. At least, that is my belief, without wanting to 100%, no doubt, absolutely stake my life on the behaviour of Visual C++... ------------------------ Derek Waters derek@lj-oz.com
Thanks for the help - I'll backup my project tonight and give that a try. Christian As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet. Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.
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I have an ATL project that started as a learning project but has come to a point of having code I would like to use. The problem is that on the way I created some functions I want to remove, but doing so breaks everything, in the least it stops mew adding more methods. Can anyone tell me how I'm supposed to do this ? Each function seems to have residue all over the place... Christian As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet. Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.