有做过佳能相机开发的吗？相机忙怎么处理？我调试时致使相机处于忙的状态，必须断电才能恢复，怎么才能用代码恢复相机呢
http://download.csdn.net/download/fool_2003/5284534
http://www.pudn.com/downloads652/sourcecode/app/detail2652513.html