未解决的外部符号编译错误

Question

I frequently have this problem when I try a new library. This time I work with PointGrey Camera and try to use its API libraries (some dll, lib, header files). Mostly, problems were fixed by configuring the SDK (I'm using VS2008) Tools/Options/VC++ Directories/include files(/library files)(/executable files),
I also tried with project configuration: + project properties/linker/input/additional dependencies + project properties/linker/General/Additional Library Directories

This time, with all this, I still have the error.

Is there a general method to deal with this problem?

do I need to understand this diagnosis from VS2008?

Error   1   error LNK2019: unresolved external symbol __imp__flycaptureGetPacketInfo referenced in function "enum FlyCaptureError __cdecl initializeStandardEventSizes(void *,struct FlyCaptureImageEvent * const)" (?initializeStandardEventSizes@@YA?AW4FlyCaptureError@@PAXQAUFlyCaptureImageEvent@@@Z)  main_2.obj  test

does using analysis tool such as Dependencies Walker ensure to solve these problems well??

Answer 1

This message says that you used a symbol (a function or a variable) in your code. This symbol was probably declared somewhere (most likely in a header file you included in your code) otherwise there would have been a compilation error. When the linker searched for the symbol (in both your object files and the lib files you instructed it to look in) it couldn't find it.

That usually happens because you forgot to let the linker know about a lib you want it to search in.

Most libraries come with a set of instruction that is supposed to help you set up everything correctly and avoid running into these problems.

Answer 2

This problem has been solved lately. I installed the incompatible library of PointGrey. That's why it didn't work. But this says something between "incompatible library" and "unresolved exertal symbol error"