onvif协议中设备发现的相关源代码，使用gsoap库-onvif device discovery protocol related to the source code, using gsoap library

onvif 协议说明，现在的网络摄像头，网络硬盘录像机通用的传输协议。-Onvif protocol specification, now network cameras, network hard disk video recorder general transport protocol.