: error: undefined reference to `cv::VideoCapture::open(std::__cxx11::basic_string

使用QT+OPENCV播放视频，本想先实现一下别人的代码、结果一堆类似这样的错误，: error: undefined reference to `cv::VideoCapture::open(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'，

整理两天各种试，最后还是问了专业同事，听取一下意见，如果.h的opencv的头文件已经添加，.pro环境已经配置，还是出现类似的问题，那可能就是你的opencv库版本不一致，我用的QT是mingGW编译器，但是一般的opencv都是用的vs，对应minGW要单独编译opencv库，或者利用别人已经编译好的，我用的是http://download.csdn.net/download/chongzi865458/9792650，放在指定文件夹，对应改写.pro文件，

INCLUDEPATH +=  D:/opencv3.2_mingw5.3.0/include\
                D:/opencv3.2_mingw5.3.0/include/opencv\
                D:/opencv3.2_mingw5.3.0/include/opencv2

LIBS += D:/opencv3.2_mingw5.3.0/x86/mingw/lib/libopencv_core320.dll.a\
        D:/opencv3.2_mingw5.3.0/x86/mingw/lib/libopencv_highgui320.dll.a\
        D:/opencv3.2_mingw5.3.0/x86/mingw/lib/libopencv_ml320.dll.a\
        D:/opencv3.2_mingw5.3.0/x86/mingw/lib/libopencv_imgproc320.dll.a\
        D:/opencv3.2_mingw5.3.0/x86/mingw/lib/libopencv_imgcodecs320.dll.a\
        D:/opencv3.2_mingw5.3.0/x86/mingw/lib/libopencv_stitching320.dll.a\
        D:/opencv3.2_mingw5.3.0/x86/mingw/lib/libopencv_calib3d320.dll.a\
        D:/opencv3.2_mingw5.3.0/x86/mingw/lib/libopencv_features2d320.dll.a\
        D:/opencv3.2_mingw5.3.0/x86/mingw/lib/libopencv_flann320.dll.a\
        D:/opencv3.2_mingw5.3.0/x86/mingw/lib/libopencv_video320.dll.a\
        D:/opencv3.2_mingw5.3.0/x86/mingw/lib/libopencv_objdetect320.dll.a\
        D:/opencv3.2_mingw5.3.0/x86/mingw/lib/libopencv_videoio320.dll.a\
        D:/opencv3.2_mingw5.3.0/x86/mingw/lib/libopencv_photo320.dll.a\
        D:/opencv3.2_mingw5.3.0/x86/mingw/lib/libopencv_shape320.dll.a\
        D:/opencv3.2_mingw5.3.0/x86/mingw/lib/libopencv_superres320.dll.a\
        D:/opencv3.2_mingw5.3.0/x86/mingw/lib/libopencv_videostab320.dll.az

最后错误明显减少。剩下的错误全部是关于VideoCapture这个类的，后来在头文件添加

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>

其实我也不知道是哪个管用了，最后构建没问题了、之前的错误不见啦

: error: undefined reference to `cv::VideoCapture::open(std::__cxx11::basic_string

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