出错在这一句语句：
findContours(openimage, temptours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_NONE);
网络上找原因，很多，一遍遍检查，最后按照这个
Under Property > C++ > code generation > Runtime libarary:
If the MSVC Runtime library is set to Multi-threaded Debug DLL (/MDd), then this is no problem (it works fine).
If the MSVC Runtime library is set to Multi-threaded Debug (/MTd), then it will throw this error, which can be fixed with the following instructions.
因为是在mfc下，又出现这个错误：
#error : Building MFC application with /MD[d] (CRT dll version) requires MFC shared dll version. P
如下解决：
将类封装成DLL时，因为类中使用了CDC类，所以需要# include “stdafx.h”.
编译时出现错误：Building MFC application with /MD[d] (CRT dll version)requires MFC shared dll version
该错误解决方法如下：
对着你的项目点击右键，依次选择：属性->配置属性->常规，然后右边有个“项目默认值”(Project Defaults)，下面有个"MFC的使用"(Use of MFC)，选择“在共享 DLL 中使用 MFC”(Use MFC in a Shared DLL)，就OK了～～～