问题：
CMake Error at CMakeLists.txt:3 (find_package):
By not providing "FindOpenCV.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "OpenCV", but
CMake did not find one.
Could not find a package configuration file provided by "OpenCV" with any
of the following names:
OpenCVConfig.cmake
opencv-config.cmake
Add the installation prefix of "OpenCV" to CMAKE_PREFIX_PATH or set
"OpenCV_DIR" to a directory containing one of the above files. If "OpenCV"
provides a separate development package or SDK, be sure it has been
installed.
解决方法一（源自https://www.cnblogs.com/LiuSY/p/5808210.html）：
打开你的CMakeLists.txt，添加set(OpenCV_DIR D:/Opencv2.4/opencv/build) 注意这是你的OpenCVConfig.cmake的路径（注意路径中的斜杠方向）
再编译就可以啦
解决方法二：
楼主用了方法一并未实现该有的效果，可能哪里操作出错了，但是发现更简单的方法。
点击下图的红圈OpenCV_DIR处，或出现后方的...按钮，点击该按钮，选择文件夹路径，该文件夹路径就是你的OpenCVConfig.cmake的路径，例如：D:/socure/OpenCV/opencv-3.3.1-mybuild。
然后点击configure，gererate，出现
好的，恭喜你解决问题了
