python 调用海康SDK，登录，设置回调，布防，撤防，注销以及释放SDK

import os
import ctypes
import datetime
import time
#获取所有的库文件到一个列表
path = "/home/caobin/chike/chike/CH_HCNetSDK_V5.2.7.4_build20170606_Linux64/lib/"
so_list = []
def add_so(path,so_list):
    files = os.listdir(path)
    for file in files:
        if not os.path.isdir(path+file):
            if file.endswith(".so"): so_list.append(path+file)
        else:
            add_so(path+file+"/",so_list)
add_so(path,so_list)

for lib in so_list:
    print(lib)

lUserID = 0
m_lAlarmHandle = 0
def callCpp(func_name,*args):
    for so_lib in so_list:
        # print(so_lib)
        try:
            lib = ctypes.cdll.LoadLibrary(so_lib)
            try:
                value = eval("lib.%s"%func_name)(*args)
                print("调用的库："+so_lib)
                print("执行成功,返回值："+str(value))
                return value
            except:
                continue
        except:
            print("库文件载入失败："+so_lib)
            continue
    print("没有找到接口！")
    return False

#定义结构体
class LPNET_DVR_DEVICEINFO_V30(ctypes.Structure):
    _fields_ = [
        ("sSerialNumber", ctypes.c_byte * 48),
        ("byAlarmInPortNum", ctypes.c_byte),
        ("byAlarmOutPortNum", ctypes.c_byte),
        ("byDiskNum", ctypes.c_byte),
        ("byDVRType", ctypes.c_byte),
        ("byChanNum", ctypes.c_byte),
        ("byStartChan", ctypes.c_byte),
        ("byAudioChanNum", ctypes.c_byte),
        ("byIPChanNum", ctypes.c_byte),
        ("byZeroChanNum", ctypes.c_byte),
        ("byMainProto", ctypes.c_byte),
        ("bySubProto", ctypes.c_byte),
        ("bySupport", ctypes.c_byte),
        ("bySupport1", ctypes.c_byte),
        ("bySupport2", ctypes.c_byte),
        ("wDevType", ctypes.c_u