OpenCV错误：LNK2019

Question

I'm using OpenCV 2.4.6 and Visual Studio 2008 with Windows8.1 x86. When I debug my program it signal me 9 errors:

1>FYD_control.obj : error LNK2019: unresolved external symbol "int __stdcall cv::waitKey(int)" (?waitKey@cv@@YGHH@Z) referenced in function _main
1>FYD_control.obj : error LNK2019: unresolved external symbol "void __stdcall cv::imshow(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class cv::_InputArray const &)" (?imshow@cv@@YGXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@ABV_InputArray@1@@Z) referenced in function _main
1>FYD_control.obj : error LNK2019: unresolved external symbol "double __stdcall cv::threshold(class cv::_InputArray const &,class cv::_OutputArray const &,double,double,int)" (?threshold@cv@@YGNABV_InputArray@1@ABV_OutputArray@1@NNH@Z) referenced in function _main
1>FYD_control.obj : error LNK2019: unresolved external symbol "void __stdcall cv::cvtColor(class cv::_InputArray const &,class cv::_OutputArray const &,int,int)" (?cvtColor@cv@@YGXABV_InputArray@1@ABV_OutputArray@1@HH@Z) referenced in function _main
1>FYD_control.obj : error LNK2019: unresolved external symbol "void __stdcall cv::medianBlur(class cv::_InputArray const &,class cv::_OutputArray const &,int)" (?medianBlur@cv@@YGXABV_InputArray@1@ABV_OutputArray@1@H@Z) referenced in function _main
1>FYD_control.obj : error LNK2019: unresolved external symbol "void __stdcall cv::fastFree(void *)" (?fastFree@cv@@YGXPAX@Z) referenced in function "public: __thiscall cv::Mat::~Mat(void)" (??1Mat@cv@@QAE@XZ)
1>FYD_control.obj : error LNK2019: unresolved external symbol "int __stdcall cv::_interlockedExchangeAdd(int *,int)" (?_interlockedExchangeAdd@cv@@YGHPAHH@Z) referenced in function "public: void __thiscall cv::Mat::release(void)" (?release@Mat@cv@@QAEXXZ)
1>FYD_control.obj : error LNK2019: unresolved external symbol "void __stdcall cv::error(class cv::Exception const &)" (?error@cv@@YGXABVException@1@@Z) referenced in function "public: int & __thiscall cv::Mat::at<int>(int,int)" (??$at@H@Mat@cv@@QAEAAHHH@Z)
1>C:\Users\___________________________\Debug\FYD2_Control.exe : fatal error LNK1120: 8 unresolved externals
1>Build log was saved at "file://c:\Users\_________________\Debug\BuildLog.htm"
1>FYD2_Control - 9 error(s), 0 warning(s)

I've analized everything and I've noticed that while in this errors I have

(?waitKey@cv@@YGHH@Z)
(?imshow@cv@@YGXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@ABV_InputArray@1@@Z)
(?threshold@cv@@YGNABV_InputArray@1@ABV_OutputArray@1@NNH@Z)
(?cvtColor@cv@@YGXABV_InputArray@1@ABV_OutputArray@1@HH@Z)
(?medianBlur@cv@@YGXABV_InputArray@1@ABV_OutputArray@1@H@Z)
(?fastFree@cv@@YGXPAX@Z)
(?_interlockedExchangeAdd@cv@@YGHPAHH@Z)
(?error@cv@@YGXABVException@1@@Z)

if I analize the .lib there is the same, but with A instead the first G

(?waitKey@cv@@YAHH@Z)
(?imshow@cv@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@ABV_InputArray@1@@Z)
(?threshold@cv@@YANABV_InputArray@1@ABV_OutputArray@1@NNH@Z)
(?cvtColor@cv@@YAXABV_InputArray@1@ABV_OutputArray@1@HH@Z)
(?medianBlur@cv@@YAXABV_InputArray@1@ABV_OutputArray@1@H@Z)
(?fastFree@cv@@YAXPAX@Z)
(?_interlockedExchangeAdd@cv@@YAHPAHH@Z)
(?error@cv@@YAXABVException@1@@Z)

Substituting the A with G in the .lib I solve this problem, but later it gives me an other error

The procedure entry point ?fastFree@cv@@YGXPAX@Z could not be
located in the dynamic link library

How can I solve this?

Sorry for my english and thank's to anyone will answer.

Answer 1

you have problem with linking. replacing A with G in your library wont help. Make sure that you have added all libraries in additional dependencies. Below are the most necessary lib files make sure you have included it.

highgui210d.lib 
cxcore210d.lib 
cv210d.lib

Once you have done this if u still get error then go to lib folder of opencv (C:\\opencv\\build\\x86\\vc12\\lib) and add all the lib files to additional dependencies (right click on your project select properties->configuration properties->linker->input then on right pane locate additional dependencies then add all lib file names) of your project.