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.NET Forum / Languages / Managed C++ / February 2005"unresolved token" link errors
Hello. How do "unresolved token" link errors occur. How do I fix them? Linking... LINK : error LNK2020: unresolved token (0A000015) ??_7type_info@@6B@ LINK : error LNK2020: unresolved token (0A000016) _CxxThrowException LINK : error LNK2020: unresolved token (0A000018) exception.__ctor LINK : error LNK2020: unresolved token (0A000019) exception.__ctor LINK : error LNK2020: unresolved token (0A00001A) exception.__dtor LINK : error LNK2020: unresolved token (0A00001C) delete LINK : error LNK2020: unresolved token (0A000022) strlen LINK : error LNK2020: unresolved token (0A000023) free LINK : error LNK2020: unresolved token (0A000026) memmove LINK : error LNK2020: unresolved token (0A00002C) memcpy LINK : error LNK2020: unresolved token (0A000032) atexit LINK : error LNK2020: unresolved token (0A00006F) memcmp LINK : fatal error LNK1120: 12 unresolved externals > How do "unresolved token" link errors occur. How do I fix them? > [quoted text clipped - 4 lines] > LINK : error LNK2020: unresolved token (0A00006F) memcmp > LINK : fatal error LNK1120: 12 unresolved externals Make sure that the option to not link in the standard library is off (it is by default). Make sure you've included any headers you need, and that you're compiling and linking C++ files in C++ language mode. If all else fails, try starting a new project and re-adding all your source files. If none of this works, please write back and give more information about your project, the files in it and the language they're in, and the options you're using. I hope this helps.  SignatureDerrick Coetzee, Microsoft Speech Server developer This posting is provided "AS IS" with no warranties, and confers no rights. Hello, Thanks for your help. The problem goes away if LIBCMTD.lib is explicitly added to the linker as an added dependency. This is the default library named in the obj files. However, another problem occurs when this is done, i.e., the linker reports: LIBCMTD.lib(crt0.obj) : error LNK2019: unresolved external symbol _main referenced in function _mainCRTStartup C:\project.dll : fatal error LNK1120: 1 unresolved externals So, after undoing the above fix attempt, and doing all that you suggested, the problem remains. However, I didn't see any link option referring to not linking in the standad library. I don't even understand what a "standard" library is. Maybe you mean the default library. The linker has an "ignore all default libraries" option, but its default value is "no", which I left alone. The C++ compiler options are: /Od /AI "C:\project directory" /D "WIN32" /D "_DEBUG" /D "_WINDLL" /D "_MBCS" /FD /EHsc /MTd /GS /Zc:wchar_t /GR /Fo"Debug/" /Fd"Debug/vc70.pdb" /W3 /nologo /c /Zi /clr /TP /FU "C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\mscorlib.dll" /FU "C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\System.dll" /FU "C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\System.Data.dll" The linker options are: /OUT:"C:\project.dll" /INCREMENTAL /NOLOGO /DLL /DEBUG /ASSEMBLYDEBUG /PDB:"C:\project.pdb" /FIXED:No nochkclr.obj mscoree.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib "\Program Files\Microsoft Visual Studio .NET 2003\Sdk\v1.1\Lib\mscoree.lib" Thanks again > "C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\mscorlib.dll" /FU > "C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\System.dll" /FU > "C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\System.Data.dll" I did a little additional research on your issue. Based on your .NET library dependencies, it appears that you are writing a mixed mode application, including both managed and unmanaged code. Mixed mode applications are not linked with the C standard library because this is unsafe due to the DLL Loading Problem. This may result in unresolved externals much like those you describe. The following article should explain how to resolve your issue correctly: http://support.microsoft.com/?id=814472 Create a fresh project and then try out the instructions on this page. You were on the right track by linking in the C runtime library, but the remaining steps are far more difficult to guess. I hope this resolves your issue, but write back if you experience further trouble. SignatureDerrick Coetzee, Microsoft Speech Server developer This posting is provided "AS IS" with no warranties, and confers no rights. Use of included code samples are subject to the terms specified at http://www.microsoft.com/info/cpyright.htm Thanks very much for you help. I'm still having problems. I performed steps 1 through 4 described in the article you provided, i.e., dealing with /NOENTRY, msvcrt.lib, nochkclr.obj, and __DllMainCRTStartup@12. The following link errors now occur. Linking... LINK : error LNK2020: unresolved token (0A00002A) std._Lockit.__dtor LINK : error LNK2020: unresolved token (0A00002B) _DebugHeapTag LINK : error LNK2020: unresolved token (0A00004D) std.ios_base.__dtor LINK : error LNK2020: unresolved token (0A000055) std._Mutex.__dtor LINK : error LNK2020: unresolved token (0A000058) ?_Id_cnt@id@locale@std@@0HA LINK : error LNK2020: unresolved token (0A00005A) std._Locinfo.__dtor LINK : error LNK2020: unresolved token (0A00005B) ?id@?$ctype@D@std@@2V0locale@2@A LINK : error LNK2020: unresolved token (0A00005C) ?id@?$ctype@_W@std@@2V0locale@2@A LINK : error LNK2020: unresolved token (0A00005D) _BADOFF LINK : error LNK2020: unresolved token (0A00005E) _Fpz LINK : fatal error LNK1120: 10 unresolved externals The link options are now: /OUT:"C:\project.dll" /INCREMENTAL /NOLOGO /DLL /NODEFAULTLIB /INCLUDE:"__DllMainCRTStartup@12" /DEBUG /ASSEMBLYDEBUG /PDB:"C:\project.pdb" /NOENTRY /FIXED:No mscoree.lib msvcrt.lib. kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib "\Program Files\Microsoft Visual Studio .NET 2003\Sdk\v1.1\Lib\mscoree.lib" I should have provided an overall description of the project. Here it is. I have a native DLL class library written in C++ that I wish to make available to .NET users. I'm trying to write a version of the DLL just for those users. Following the documentation's suggestion, I wrote a "Managed Extensions wrapper class". Data marshalling is being done manually. Thanks again. > I should have provided an overall description of the project. Here it is. I > have a native DLL class library written in C++ that I wish to make available > to .NET users. I'm trying to write a version of the DLL just for those > users. Following the documentation's suggestion, I wrote a "Managed > Extensions wrapper class". Data marshalling is being done manually. I will investigate your new problems more thoroughly later, but first let me say that mixed-mode DLLs such as the one you're writing are notoriously problematic, due mainly to the Mixed DLL Loading Problem, which you can learn about here: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dv_vstechart/ht ml/vcconMixedDLLLoadingProblem.asp You may be able to save a great deal of trouble by using some other technique for communicating with your unmanaged code, such as writing a wrapper in a purely-managed DLL and using PInvoke from it to invoke your unmanaged DLL's functionality. You can also use IPC or even just have your clients use PInvoke on your unmanaged DLL. If you must use mixed-mode, try and arrange that your unmanaged program doesn't use any global or static data of any kind; if they do this will put the burden of manual initialization on each of your clients when loading your DLL. SignatureDerrick Coetzee, Microsoft Speech Server developer This posting is provided "AS IS" with no warranties, and confers no rights. Use of included code samples are subject to the terms specified at http://www.microsoft.com/info/cpyright.htm I forgot to mention that another change I made was to set the /NODEFAULTLIB linker option. After removing this option it now compiles successfully. Thanks a million! > I forgot to mention that another change I made was to set the /NODEFAULTLIB > linker option. After removing this option it now compiles successfully. > Thanks a million! Oops, missed this mail. I'm glad your program is now compiling! Be careful, though, to make sure you're addressing the Mixed DLL Loading Problem by either not using static or global data or by ensuring that it's initialized correctly, as the remainder of the previously linked article describes. I hope you encounter no more problems; please write back if you do. Good luck! SignatureDerrick Coetzee, Microsoft Speech Server developer This posting is provided "AS IS" with no warranties, and confers no rights. Ciao Ian Lazarus :-) and Friends Well It's Pradeep, I am also getting the same sequence of errors when I am building my project ... It is by the way compiling without any problem. After following some of the suggestions that I could perform .. Now I am getting following : ------ Build started: Project: example, Configuration: Debug Win32 ------ Linking... LINK : error LNK2020: unresolved token (0A000013) std._Lockit.__dtor LINK : error LNK2020: unresolved token (0A000014) _DebugHeapTag LINK : error LNK2020: unresolved token (0A000031) legorobot.__dtor LINK : error LNK2020: unresolved token (0A000054) ?_Id_cnt@id@locale@std@@0HA LINK : error LNK2020: unresolved token (0A000056) std._Locinfo.__dtor LINK : error LNK2020: unresolved token (0A000057) ?id@?$ctype@D@std@@2V0locale@2@A LINK : error LNK2020: unresolved token (0A000058) cin LINK : error LNK2020: unresolved token (0A000059) cout LINK : fatal error LNK1120: 8 unresolved externals Waiting for Someones encouraging response. -best regards VinDeep Ciao Ian :-) At present my Linker -> Command Line Option looks like this /OUT:"E:\btp_project\example\Debug\example.exe" /INCREMENTAL /NOLOGO /NODEFAULTLIB /DEBUG /ASSEMBLYDEBUG /PDB:"E:\btp_project\example\Debug/example.pdb" /FIXED:No LIBCMTD.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib And I have selected Ignore All Default Libraries as (Yes/NODEFAULTLIB) And in Linker Input I have written Additional Dependencies -> LIBCMTD.lib Waiting ..for someones response -best regards VinDeep Hi, I have developed a project in VC++ in which I am accessing a VB DLL. I have created that dll through following command. wsdl [url]http://10.2.1.44/WebService1/Service1.asmx[/url] /l:vb /out:service1.vb vbc /t:library /r:System.dll,System.web.services.dll,System.xml.dll Service1.vb Now I am calling a method called HelloWorld from my main module in VC++ as follows :: int _tmain() { Service1 *ob = new Service1(); System::Console::WriteLine("LastName:",ob->HelloWorld()); return 0; } Well I am able to build the project without any problem ... but the String that is supposed to be returned ... nothing appears in console. What to do now .. Since till now I was getting some errors but now its a normal execution so .. no idea which side I am doing wrong .... best regards VinDeep Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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