mingw连接那些事

In MinGW you don’t put the full name of the libraries, the linker will add the extension and the lib prefix. So when you say -llibcurl the linker will look for liblibcurl.a. Just use -lcurl and it will work.

由上可知，有以下两种方式：

1. g++ my.cpp -l opencv_core249
2. g++ my.cpp -l opencv_core249.dll

其实，这两种方法均可以，最好就用第一种了