When you use MFC in a static library to cause library conflicts, find one or more symbols with multiple definitions.

It is okay to use MFC in the shared library for the project. The following problem occurs when you use MFC in a static library.

1> msvcrtd. lib (ti_inst.obj): error LNK2005: "private: _ thiscall type_info: type_info (class type_info const &)"(?? 0type_info @ AAE @ ABV0 @ Z) has been defined in libcmtd. lib (typinfo. obj)

1> msvcrtd. lib (ti_inst.obj): error LNK2005: "private: class type_info & _ thiscall type_info: operator = (class type_info const &)"(?? 4type_info @ AAEAAV0 @ ABV0 @ Z) has been defined in libcmtd. lib (typinfo. obj)
1> msvcrtd. lib (MSVCR100D. dll): error LNK2005: _ wcsrchr has been defined in libcmtd. lib (wcsrchr. obj)
1> libcmtd. lib (crt0init. obj): warning LNK4098: the default library "msvcrtd. lib" conflicts with other libraries. Use/NODEFAULTLIB: library

1> G: \ MFCProjiect \ VideoLog \ Debug \ VideoLog.exe: fatal error LNK1169: locate one or more symbols with multiple definitions

I checked it online and said that a default library should be ignored.

After libcmtd. lib is ignored

1> Strmbasd. lib (mtype. obj): warning LNK4075: Ignore "/EDITANDCONTINUE" (due to the "/OPT: ICF" Specification)
1> uafxcw. lib (appcore. obj): error LNK2001: an external symbol that cannot be parsed ___ wargv
1> uafxcw. lib (appcore. obj): error LNK2001: external symbol that cannot be parsed ___ argc
1> G: \ MFCProjiect \ VideoLog \ Release \ VideoLog.exe: fatal error LNK1120: 2 external commands that cannot be parsed
1>
1> generation failed.

After msvcrtd. lib is ignored

1> Strmbasd. lib (mtype. obj): warning LNK4075: Ignore "/EDITANDCONTINUE" (due to the "/OPT: ICF" Specification)
1> Strmbasd. lib (wxdebug. obj): error LNK2001: external symbol that cannot be parsed _ imp ___ vsnwprintf
1> Strmbasd. lib (wxdebug. obj): error LNK2001: external symbol that cannot be parsed _ imp ___ vsnprintf
1> G: \ MFCProjiect \ VideoLog \ Release \ VideoLog.exe: fatal error LNK1120: 2 external commands that cannot be parsed
1>
1> generation failed.

Solution:

Define _ afxdll, project-> seting-> C/C ++-> Preprocessor-> DEFINE _ afxdll in Preprocessor. If the error message "Fatal error c1189: # error: please use the/MD switch for _ afxdll builds" appears, modify the following code: c/C ++-> code generation-> multithread DLL (Implementation/MD option)

Solve the problem and close the work.

Or use MFC in the shared library.