Doubt in including libraries in VS08

[kunigami]

Hi all,

I'm with a little doubt concerning linking libraries, I'm using Visual Studio 2008.

I've implemented a library in a project A: an 'example.h' and an 'example.cpp' file. In the .h file I provide the interface and in the .cpp I actually implement them.

Then I have another project B and want to use the library from the project A wihtout copying the hole code into this project B. So I use "include" with the full path to the header file in project A. But then it won't compile since it will not find the implementation of this interface.

The error I get is:
error LNK2028: unresolved token

It's cleary a wrong way to link things together. Can anyone help me to do it right?
Thanks in advance,

[helios]

You should put all your includes in one place, then add that directory to the list of include directories (tools->options->projects and solutions->VC++ directories->show directories for: include files).
To fix the linker errors, you need to add the .cpp to the project.

[z05DSL3A]

From the MSDN docs^[1], it looks like you are trying to import native code into a pure managed (.net) project.

[1] http://msdn.microsoft.com/en-us/library/ms235590(VS.80).aspx

[kunigami]

Hi,
@helios: Thanks, I think I did the same thing you described, but only for the current project. I went to: Project Properties > Configuration Properties > C/C++ > General > Additional Include Directories.

@Gray Wolf: I'm using only native code.

But I don't know exactly why, I only managed to compile everything putting all the code in header files. I only use .cpp code when using the main() procedure.

[z05DSL3A]

Can you post the full output message or the bulid log (better)?

[kunigami]

Here is the output error when I try to compile splitting into header and source files.

	

Compiling...
Facility_Location.cpp
c:\documents and settings\guilherme\meus documentos\visual studio 2008\projects\facility_location\facility_location\Facility_Location_Algorithm1.h(95) : warning C4018: '<' : signed/unsigned mismatch
c:\documents and settings\guilherme\meus documentos\visual studio 2008\projects\facility_location\facility_location\Facility_Location_Gen.h(40) : warning C4244: 'argument' : conversion from 'time_t' to 'unsigned int', possible loss of data
c:\documents and settings\guilherme\meus documentos\visual studio 2008\projects\facility_location\facility_location\Facility_Location_Gen.h(69) : warning C4018: '<' : signed/unsigned mismatch
.\Facility_Location.cpp(38) : warning C4018: '<' : signed/unsigned mismatch
.\Facility_Location.cpp(43) : warning C4018: '<' : signed/unsigned mismatch
Linking...
Facility_Location.obj : error LNK2028: unresolved token (0A0003E4) "public: void __thiscall Simplex::optimal_solution(class std::vector > &,class std::vector > &)" (?optimal_solution@Simplex@@$$FQAEXAAV?$vector@HV?$allocator@H@std@@@std@@AAV?$vector@NV?$allocator@N@std@@@3@@Z) referenced in function "double __cdecl solve1(class std::vector >,class Matrix)" (?solve1@@$$FYANV?$vector@NV?$allocator@N@std@@@std@@V?$Matrix@N@@@Z)
Facility_Location.obj : error LNK2028: unresolved token (0A0003E5) "public: double __thiscall Simplex::optimal_value(void)" (?optimal_value@Simplex@@$$FQAENXZ) referenced in function "double __cdecl solve1(class std::vector >,class Matrix)" (?solve1@@$$FYANV?$vector@NV?$allocator@N@std@@@std@@V?$Matrix@N@@@Z)
Facility_Location.obj : error LNK2028: unresolved token (0A0003E7) "public: int __thiscall Simplex::solve(void)" (?solve@Simplex@@$$FQAEHXZ) referenced in function "double __cdecl solve1(class std::vector >,class Matrix)" (?solve1@@$$FYANV?$vector@NV?$allocator@N@std@@@std@@V?$Matrix@N@@@Z)
Facility_Location.obj : error LNK2028: unresolved token (0A0003E8) "public: bool __thiscall Simplex::add_restriction(class std::vector > &,double,char)" (?add_restriction@Simplex@@$$FQAE_NAAV?$vector@NV?$allocator@N@std@@@std@@ND@Z) referenced in function "double __cdecl solve1(class std::vector >,class Matrix)" (?solve1@@$$FYANV?$vector@NV?$allocator@N@std@@@std@@V?$Matrix@N@@@Z)
Facility_Location.obj : error LNK2028: unresolved token (0A0003E9) "public: bool __thiscall Simplex::add_obj_func(class std::vector >)" (?add_obj_func@Simplex@@$$FQAE_NV?$vector@NV?$allocator@N@std@@@std@@@Z) referenced in function "double __cdecl solve1(class std::vector >,class Matrix)" (?solve1@@$$FYANV?$vector@NV?$allocator@N@std@@@std@@V?$Matrix@N@@@Z)
Facility_Location.obj : error LNK2028: unresolved token (0A0003EA) "public: __thiscall Simplex::Simplex(void)" (??0Simplex@@$$FQAE@XZ) referenced in function "double __cdecl solve1(class std::vector >,class Matrix)" (?solve1@@$$FYANV?$vector@NV?$allocator@N@std@@@std@@V?$Matrix@N@@@Z)
Facility_Location.obj : error LNK2019: unresolved external symbol "public: void __thiscall Simplex::optimal_solution(class std::vector > &,class std::vector > &)" (?optimal_solution@Simplex@@$$FQAEXAAV?$vector@HV?$allocator@H@std@@@std@@AAV?$vector@NV?$allocator@N@std@@@3@@Z) referenced in function "double __cdecl solve1(class std::vector >,class Matrix)" (?solve1@@$$FYANV?$vector@NV?$allocator@N@std@@@std@@V?$Matrix@N@@@Z)
Facility_Location.obj : error LNK2019: unresolved external symbol "public: double __thiscall Simplex::optimal_value(void)" (?optimal_value@Simplex@@$$FQAENXZ) referenced in function "double __cdecl solve1(class std::vector >,class Matrix)" (?solve1@@$$FYANV?$vector@NV?$allocator@N@std@@@std@@V?$Matrix@N@@@Z)
Facility_Location.obj : error LNK2019: unresolved external symbol "public: int __thiscall Simplex::solve(void)" (?solve@Simplex@@$$FQAEHXZ) referenced in function "double __cdecl solve1(class std::vector >,class Matrix)" (?solve1@@$$FYANV?$vector@NV?$allocator@N@std@@@std@@V?$Matrix@N@@@Z)
Facility_Location.obj : error LNK2019: unresolved external symbol "public: bool __thiscall Simplex::add_restriction(class std::vector > &,double,char)" (?add_restriction@Simplex@@$$FQAE_NAAV?$vector@NV?$allocator@N@std@@@std@@ND@Z) referenced in function "double __cdecl solve1(class std::vector >,class Matrix)" (?solve1@@$$FYANV?$vector@NV?$allocator@N@std@@@std@@V?$Matrix@N@@@Z)
Facility_Location.obj : error LNK2019: unresolved external symbol "public: bool __thiscall Simplex::add_obj_func(class std::vector >)" (?add_obj_func@Simplex@@$$FQAE_NV?$vector@NV?$allocator@N@std@@@std@@@Z) referenced in function "double __cdecl solve1(class std::vector >,class Matrix)" (?solve1@@$$FYANV?$vector@NV?$allocator@N@std@@@std@@V?$Matrix@N@@@Z)
Facility_Location.obj : error LNK2019: unresolved external symbol "public: __thiscall Simplex::Simplex(void)" (??0Simplex@@$$FQAE@XZ) referenced in function "double __cdecl solve1(class std::vector >,class Matrix)" (?solve1@@$$FYANV?$vector@NV?$allocator@N@std@@@std@@V?$Matrix@N@@@Z)
C:\Documents and Settings\Guilherme\Meus documentos\Visual Studio 2008\Projects\Facility_Location\Debug\Facility_Location.exe : fatal error LNK1120: 12 unresolved externals

[z05DSL3A]

I have been playing around with a few ideas, but have not been able to recreate an error LNK2028.

You may have to post your code, and give a description of what you have done, but is not happy about the Simplex class.