Unresolved external
in [MFC]
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From: Jaime Stuardo on 23 Feb 2005 21:07 Hi all... I have a DLL ( A ) that uses some controls present in another DLL ( B ). All works well except when I derive a class from a control implemented in DLL B. That derived class is present in DLL A. I receive the following linker error: Linking... Creating library Debug/Handkey.lib and object Debug/Handkey.exp Masked.obj : error LNK2001: unresolved external symbol "public: static struct CRuntimeClass const CSuperEditEx::classCSuperEditEx" (?classCSuperEditEx(a)CSuperEditEx@@2UCRuntimeClass@@B) Masked.obj : error LNK2001: unresolved external symbol "protected: static struct AFX_MSGMAP const CSuperEditEx::messageMap" (?+messageMap(a)CSuperEditEx@@1UAFX_MSGMAP@@B) .../Debug/Handkey.bpx : fatal error LNK1120: 2 unresolved externals Error executing link.exe. By seeing those messages I can realize that the problem is at these lines: DECLARE_MESSAGE_MAP() in MASKED.H file and IMPLEMENT_DYNAMIC(CMaskEdit, CSuperEditEx) in MASKED.CPP file This is the declaration of the imported class: class AFX_EXT_CLASS CSuperEditEx : public CEdit { DECLARE_DYNAMIC(CSuperEditEx) ........................... } As I told, I use this class (CSuperEditEx, present in DLL B) in a lot of places of DLL A with no problem. The problem existed when I derived a class from CSuperEditEx. I have tested all I could do without success. I have even seen the content of the.LIB file corresponding of DLL B and I saw: __imp_?classCSuperEditEx(a)CSuperEditEx@@2UCRuntimeClass@@B and __imp_?messageMap(a)CSuperEditEx@@1UAFX_MSGMAP@@B As you see, those strings are almost the same as the shown in the linking error. That "__imp" makes the difference. Any help will be greatly appreciated Jaime
From: Frank Hickman [MVP] on 23 Feb 2005 23:10 "Jaime Stuardo" <jstuardo(a)manquehue.net> wrote in message news:OW8$WWhGFHA.3312(a)TK2MSFTNGP10.phx.gbl... > Hi all... > > I have a DLL ( A ) that uses some controls present in another DLL ( B ). > > All works well except when I derive a class from a control implemented in > DLL B. That derived class is present in DLL A. > > I receive the following linker error: > Linking... > Creating library Debug/Handkey.lib and object Debug/Handkey.exp > Masked.obj : error LNK2001: unresolved external symbol "public: static > struct CRuntimeClass const CSuperEditEx::classCSuperEditEx" > (?classCSuperEditEx(a)CSuperEditEx@@2UCRuntimeClass@@B) > Masked.obj : error LNK2001: unresolved external symbol "protected: static > struct AFX_MSGMAP const CSuperEditEx::messageMap" > (?+messageMap(a)CSuperEditEx@@1UAFX_MSGMAP@@B) > ../Debug/Handkey.bpx : fatal error LNK1120: 2 unresolved externals > Error executing link.exe. > > By seeing those messages I can realize that the problem is at these lines: > > DECLARE_MESSAGE_MAP() in MASKED.H file > and > IMPLEMENT_DYNAMIC(CMaskEdit, CSuperEditEx) in MASKED.CPP file > > This is the declaration of the imported class: > > class AFX_EXT_CLASS CSuperEditEx : public CEdit > { > DECLARE_DYNAMIC(CSuperEditEx) > .......................... > } > > As I told, I use this class (CSuperEditEx, present in DLL B) in a lot of > places of DLL A with no problem. The problem existed when I derived a > class from CSuperEditEx. > > I have tested all I could do without success. I have even seen the content > of the.LIB file corresponding of DLL B and I saw: > __imp_?classCSuperEditEx(a)CSuperEditEx@@2UCRuntimeClass@@B > and > __imp_?messageMap(a)CSuperEditEx@@1UAFX_MSGMAP@@B > > As you see, those strings are almost the same as the shown in the linking > error. That "__imp" makes the difference. > > Any help will be greatly appreciated > > Jaime I'd have to see your project settings and files to know for sure but it looks as if the AFX_EXT_CLASS macro is not being declared correctly or maybe the DLL(B) import library is not being linked into your project. -- ============ Frank Hickman Microsoft MVP NobleSoft, Inc. ============ Replace the _nosp(a)m_ with @ to reply.
From: rajkumar on 24 Feb 2005 15:14 The problem is that the DECLARE/IMPLEMENT macro creates some magic static variables. These are not exported by default. You may have to redefine your DECLARE/IMLEMENT to say MY_DECLARE_DYNAMIC etc and export the appropriates things in the MY_DECLARE_DYNAMIC macro
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