Debugging program Problems

Many problems have occurred recently during program debugging.

1: error LNK2001: unresolved external symbol "void _ cdecl ErrDisplay (class CString &)"(? ErrDisplay @ YAXAAVCString @ Z) and so on. The compilation is successful and the function name is not found during connection, the possible problem is that a library file is written in c language or other languages, and the current project is a c ++ compiler.

2: another problem is that a class is defined, but the member functions of the class are accidentally commented out, resulting in a connection error.

3: another problem is that LNK4098: defaultlib "LIBCMT" conflicts with use of other libs; this is caused by inconsistent settings of each database, generally, the settings are consistent in project-setting-c ++-code.

4: Another one is error LNK2001: unresolved external symbol _ endthreadex. Set the thread to multiple threads.

5: mkl_c.lib: warning LNK4003: invalid library format; library ignored, error LNK2001: unresolved external symbol "void _ cdecl dgemv (char const *, int const *, int const *, double const *, double const *, int const *, double const *, int const *, double const *, double *, int const *)"(? Dgemv @ yaxpbdpbh1pbn212pan1 @ Z), started to think that it is caused by the first sentence mkl_c.lib being ignored. In fact, this is not the reason, because dgemv is compiled by c, the c ++ compiler is used here. The following is the first question.

6: error LNK2001: unresolved external symbol "void * _ cdecl operator new (unsigned int )"(??2 at YAPAXI@ Z) the error is a system error. solution:

1. Add the following two libraries to Configuration Properties> Linker> Input> Igonre Specific Library:
Nafxcwd. lib Libcmtd. lib

 

2. Configuration Properties-> Linker-> Command Line-> Addtional Option: append the two lib

Nafxcw. lib Libcmt. lib
It took me a lot of time to wait for errors like this.

 

7: error LNK2019: the external symbol "void _ cdecl ErrDisp (class ATL: CStringT <char, class StrTraitMFC_DLL <char, class ATL :: chTraitsCRT <char >> &)"(? ErrDisp @ YAXAAV? $ CStringT @ DV? $ StrTraitMFC_DLL @ DV? $ ChTraitsCRT @ D @ ATL @ Z), which is referenced in function _ main.

This problem is very strange, mainly because the CString class is used in the static library function, and the above problem occurs during the call. I checked a lot of information online and did not use it, after reading Microsoft's technical support, you can add the CString import template, and some others can add the cstring. h or atlstr. h is enough, but I tried it and still couldn't solve the problem. Finally, I converted all the cstrings into char *, in fact, the solution to this problem is to change the attribute-> Configuration Attribute-> General-> the use of MFC to "use the standard Windows library", and then recompile it. Supplement: I didn't see this problem during vc6 compilation. This problem occurs during vs2005 compilation. So I thought it was because of the parameter setting problem, so I tried a lot, finally, the problem is solved.