直接加配置好的props文件到新的工程时，会出现imread读出来的Mat为空的情形，搜了一下，发现是opencv的配置问题！！！
是这样的，之前配置时为了省事儿，无论是Debug还是Release中的附加依赖项，都添加了所有的lib，也就是没有分Debug和Release。
但实际上OpenCv是要分的，文件名尾带d的为Debug库函数，不带d的为Release库函数。只需将其中库函数分开添加进附加依赖项即可：
其他版本以此类推。
Debug库：
opencv_calib3d244d.lib
opencv_contrib244d.lib
opencv_core244d.lib
opencv_features2d244d.lib
opencv_flann244d.lib
opencv_gpu244d.lib
opencv_highgui244d.lib
opencv_imgproc244d.lib
opencv_legacy244d.lib
opencv_ml244d.lib
opencv_nonfree244d.lib
opencv_objdetect244d.lib
opencv_photo244d.lib
opencv_stitching244d.lib
opencv_ts244d.lib
opencv_video244d.lib
opencv_videostab244d.lib
Release库：
opencv_calib3d244.lib
opencv_contrib244.lib
opencv_core244.lib
opencv_features2d244.lib
opencv_flann244.lib
opencv_gpu244.lib
opencv_highgui244.lib
opencv_imgproc244.lib
opencv_legacy244.lib
opencv_ml244.lib
opencv_nonfree244.lib
opencv_objdetect244.lib
opencv_photo244.lib
opencv_stitching244.lib
opencv_ts244.lib
opencv_video244.lib
opencv_videostab244.lib
这样修改后，发现还是不行，为什么呢？后来发现还跟平台有关系，不能多添加x86的平台
解决之后发现就可以读图啦~