QT 百度地图接入

参考资料：

https://www.cnblogs.com/sigma0/p/7220334.html

https://blog.csdn.net/caoshangpa/article/details/51015483

http://www.cnblogs.com/i-gps/archive/2012/06/09/2543332.html

http://blog.sina.com.cn/s/blog_7d0e2a110102v1o1.html

http://lbsyun.baidu.com