一个ACTIVEX OCX控件开发的好例子，不要错过了，按钮控件实现多线程数据库查询。-ACTIVEX OCX control the development of a good example, do not miss out, the Button control to achieve multi-threaded database query.

控件为MFC下编写的OCX控件实现基本的数字随机验证码，同时附带用MFC编写控件测试程序，包含控件注册和卸载程序，包含全部源码和说明文档。（嘻嘻，自己课程Project亲自做的，欢迎初学者交流，高手莫进）-The control is written under the MFC OCX control for basic digital random verification code that came with MFC write control testing procedures to