C++ 由于未解析的外部变量，OpenCV 无法编译 -- LNK2019

OpenCV won't compile due to unresolved externals -- LNK2019

提问by loganfarr

I am brand new to OpenCV and have been trying to set it up in Visual Studios 2010 Ultimate. I have followed the documentation exactly, and linked the files as it said. Here are the additional libraries that I am using:

我是 OpenCV 的新手，一直在尝试在 Visual Studios 2010 Ultimate 中进行设置。我完全遵循了文档，并按照它所说的链接了文件。以下是我正在使用的其他库：

opencv_core231d.lib
opencv_imgproc231d.lib
opencv_highgui231d.lib
opencv_ml231d.lib
opencv_video231d.lib
opencv_features2d231d.lib
opencv_calib3d231d.lib
opencv_objdetect231d.lib
opencv_contrib231d.lib
opencv_legacy231d.lib
opencv_flann231d.lib

And all of their Release counterparts. However, when I try to debug & compile the sample code given to me, I get the following errors. (I read somewhere that you have to compile and publish the project in order for it to work properly? Is that true as well?)

以及他们所有的 Release 对应项。但是，当我尝试调试和编译给我的示例代码时，出现以下错误。（我在某处读到您必须编译和发布项目才能使其正常工作？也是这样吗？）

1>------ Build started: Project: openCVTest, Configuration: Debug Win32 ------
1>Build started 5/6/2012 10:39:03 AM.
1>InitializeBuildStatus:
1>  Touching "Debug\openCVTest.unsuccessfulbuild".
1>ClCompile:
1>  All outputs are up-to-date.
1>ManifestResourceCompile:
1>  All outputs are up-to-date.
1>openCVTest.obj : error LNK2019: unresolved external symbol _cvWaitKey referenced in function _main
1>openCVTest.obj : error LNK2019: unresolved external symbol "void __cdecl cv::imshow(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class cv::_InputArray const &)" (?imshow@cv@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@ABV_InputArray@1@@Z) referenced in function _main
1>openCVTest.obj : error LNK2019: unresolved external symbol "public: __thiscall cv::_InputArray::_InputArray(class cv::Mat const &)" (??0_InputArray@cv@@QAE@ABVMat@1@@Z) referenced in function _main
1>openCVTest.obj : error LNK2019: unresolved external symbol _cvMoveWindow referenced in function _main
1>openCVTest.obj : error LNK2019: unresolved external symbol "void __cdecl cv::namedWindow(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,int)" (?namedWindow@cv@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@H@Z) referenced in function _main
1>openCVTest.obj : error LNK2019: unresolved external symbol "public: virtual double __thiscall cv::VideoCapture::get(int)" (?get@VideoCapture@cv@@UAENH@Z) referenced in function _main
1>openCVTest.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall cv::VideoCapture::~VideoCapture(void)" (??1VideoCapture@cv@@UAE@XZ) referenced in function _main
1>openCVTest.obj : error LNK2019: unresolved external symbol "public: virtual bool __thiscall cv::VideoCapture::isOpened(void)const " (?isOpened@VideoCapture@cv@@UBE_NXZ) referenced in function _main
1>openCVTest.obj : error LNK2019: unresolved external symbol "public: __thiscall cv::VideoCapture::VideoCapture(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (??0VideoCapture@cv@@QAE@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) referenced in function _main
1>openCVTest.obj : error LNK2019: unresolved external symbol "void __cdecl cv::fastFree(void *)" (?fastFree@cv@@YAXPAX@Z) referenced in function "public: __thiscall cv::Mat::~Mat(void)" (??1Mat@cv@@QAE@XZ)
1>openCVTest.obj : error LNK2019: unresolved external symbol "public: void __thiscall cv::Mat::deallocate(void)" (?deallocate@Mat@cv@@QAEXXZ) referenced in function "public: void __thiscall cv::Mat::release(void)" (?release@Mat@cv@@QAEXXZ)
1>openCVTest.obj : error LNK2019: unresolved external symbol "class cv::Scalar_<double> __cdecl cv::sum(class cv::_InputArray const &)" (?sum@cv@@YA?AV?$Scalar_@N@1@ABV_InputArray@1@@Z) referenced in function "double __cdecl getPSNR(class cv::Mat const &,class cv::Mat const &)" (?getPSNR@@YANABVMat@cv@@0@Z)
1>openCVTest.obj : error LNK2019: unresolved external symbol "public: class cv::MatExpr __thiscall cv::Mat::mul(class cv::_InputArray const &,double)const " (?mul@Mat@cv@@QBE?AVMatExpr@2@ABV_InputArray@2@N@Z) referenced in function "double __cdecl getPSNR(class cv::Mat const &,class cv::Mat const &)" (?getPSNR@@YANABVMat@cv@@0@Z)
1>openCVTest.obj : error LNK2019: unresolved external symbol "public: void __thiscall cv::Mat::convertTo(class cv::_OutputArray const &,int,double,double)const " (?convertTo@Mat@cv@@QBEXABV_OutputArray@2@HNN@Z) referenced in function "double __cdecl getPSNR(class cv::Mat const &,class cv::Mat const &)" (?getPSNR@@YANABVMat@cv@@0@Z)
1>openCVTest.obj : error LNK2019: unresolved external symbol "void __cdecl cv::absdiff(class cv::_InputArray const &,class cv::_InputArray const &,class cv::_OutputArray const &)" (?absdiff@cv@@YAXABV_InputArray@1@0ABV_OutputArray@1@@Z) referenced in function "double __cdecl getPSNR(class cv::Mat const &,class cv::Mat const &)" (?getPSNR@@YANABVMat@cv@@0@Z)
1>openCVTest.obj : error LNK2019: unresolved external symbol "public: __thiscall cv::_OutputArray::_OutputArray(class cv::Mat &)" (??0_OutputArray@cv@@QAE@AAVMat@1@@Z) referenced in function "double __cdecl getPSNR(class cv::Mat const &,class cv::Mat const &)" (?getPSNR@@YANABVMat@cv@@0@Z)
1>openCVTest.obj : error LNK2019: unresolved external symbol "class cv::Scalar_<double> __cdecl cv::mean(class cv::_InputArray const &,class cv::_InputArray const &)" (?mean@cv@@YA?AV?$Scalar_@N@1@ABV_InputArray@1@0@Z) referenced in function "class cv::Scalar_<double> __cdecl getMSSIM(class cv::Mat const &,class cv::Mat const &)" (?getMSSIM@@YA?AV?$Scalar_@N@cv@@ABVMat@2@0@Z)
1>openCVTest.obj : error LNK2019: unresolved external symbol "class cv::_OutputArray const & __cdecl cv::noArray(void)" (?noArray@cv@@YAABV_OutputArray@1@XZ) referenced in function "class cv::Scalar_<double> __cdecl getMSSIM(class cv::Mat const &,class cv::Mat const &)" (?getMSSIM@@YA?AV?$Scalar_@N@cv@@ABVMat@2@0@Z)
1>openCVTest.obj : error LNK2019: unresolved external symbol "void __cdecl cv::divide(class cv::_InputArray const &,class cv::_InputArray const &,class cv::_OutputArray const &,double,int)" (?divide@cv@@YAXABV_InputArray@1@0ABV_OutputArray@1@NH@Z) referenced in function "class cv::Scalar_<double> __cdecl getMSSIM(class cv::Mat const &,class cv::Mat const &)" (?getMSSIM@@YA?AV?$Scalar_@N@cv@@ABVMat@2@0@Z)
1>openCVTest.obj : error LNK2019: unresolved external symbol "class cv::MatExpr __cdecl cv::operator+(class cv::Mat const &,class cv::Mat const &)" (??Hcv@@YA?AVMatExpr@0@ABVMat@0@0@Z) referenced in function "class cv::Scalar_<double> __cdecl getMSSIM(class cv::Mat const &,class cv::Mat const &)" (?getMSSIM@@YA?AV?$Scalar_@N@cv@@ABVMat@2@0@Z)
1>openCVTest.obj : error LNK2019: unresolved external symbol "class cv::MatExpr __cdecl cv::operator+(class cv::MatExpr const &,class cv::Scalar_<double> const &)" (??Hcv@@YA?AVMatExpr@0@ABV10@ABV?$Scalar_@N@0@@Z) referenced in function "class cv::Scalar_<double> __cdecl getMSSIM(class cv::Mat const &,class cv::Mat const &)" (?getMSSIM@@YA?AV?$Scalar_@N@cv@@ABVMat@2@0@Z)
1>openCVTest.obj : error LNK2019: unresolved external symbol "class cv::MatExpr __cdecl cv::operator*(double,class cv::Mat const &)" (??Dcv@@YA?AVMatExpr@0@NABVMat@0@@Z) referenced in function "class cv::Scalar_<double> __cdecl getMSSIM(class cv::Mat const &,class cv::Mat const &)" (?getMSSIM@@YA?AV?$Scalar_@N@cv@@ABVMat@2@0@Z)
1>openCVTest.obj : error LNK2019: unresolved external symbol "void __cdecl cv::GaussianBlur(class cv::_InputArray const &,class cv::_OutputArray const &,class cv::Size_<int>,double,double,int)" (?GaussianBlur@cv@@YAXABV_InputArray@1@ABV_OutputArray@1@V?$Size_@H@1@NNH@Z) referenced in function "class cv::Scalar_<double> __cdecl getMSSIM(class cv::Mat const &,class cv::Mat const &)" (?getMSSIM@@YA?AV?$Scalar_@N@cv@@ABVMat@2@0@Z)
1>openCVTest.obj : error LNK2019: unresolved external symbol "public: void __thiscall cv::Mat::copySize(class cv::Mat const &)" (?copySize@Mat@cv@@QAEXABV12@@Z) referenced in function "public: __thiscall cv::Mat::Mat(class cv::Mat const &)" (??0Mat@cv@@QAE@ABV01@@Z)
1>openCVTest.obj : error LNK2019: unresolved external symbol "void __cdecl cv::subtract(class cv::_InputArray const &,class cv::_InputArray const &,class cv::_OutputArray const &,class cv::_InputArray const &,int)" (?subtract@cv@@YAXABV_InputArray@1@0ABV_OutputArray@1@0H@Z) referenced in function "class cv::Mat & __cdecl cv::operator-=(class cv::Mat const &,class cv::Mat const &)" (??Zcv@@YAAAVMat@0@ABV10@0@Z)
1>C:\Users\Logan\documents\visual studio 2010\Projects\openCVTest\Debug\openCVTest.exe : fatal error LNK1120: 25 unresolved externals
1>
1>Build FAILED.
1>
1>Time Elapsed 00:00:00.40
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

I went through all my directories and made sure that the libraries, did in fact, exist in my OpenCV files, and my download didn't corrupt or anything. Any help would be appreciated!

我浏览了所有目录并确保这些库确实存在于我的 OpenCV 文件中，并且我的下载没有损坏或任何东西。任何帮助，将不胜感激！

-Logantf17

-Logantf17

采纳答案by guinny

shambool in another threadjust pointed that you should maybe read this.

另一个线程中的shambool只是指出你应该阅读这个。

回答by Jeremy Whitcher

I ran into the same problem and found that I was targeting a 32-bit platform. The answer was to change my project to target x64. The instructions are located at: http://msdn.microsoft.com/en-us/library/vstudio/ms185328.aspx.

我遇到了同样的问题，发现我的目标是 32 位平台。答案是将我的项目更改为面向 x64。说明位于：http: //msdn.microsoft.com/en-us/library/vstudio/ms185328.aspx。

I also found the reference listed above by chaiy was very useful. Here it is again: http://docs.opencv.org/trunk/doc/tutorials/introduction/windows_visual_studio_Opencv/windows_visual_studio_Opencv.html#windows-visual-studio-how-to

我还发现 chaiy 上面列出的参考资料非常有用。又来了：http: //docs.opencv.org/trunk/doc/tutorials/introduction/windows_visual_studio_Opencv/windows_visual_studio_Opencv.html#windows-visual-studio-how-to