python调用海康人脸相机登录等接口(开发环境Linux)

python调用海康SDK存在几个问题，一是海康官方没有python技术支持，二是海康SDK涉及到的参数传递特

别多，因此不建议直接用python调用海康SDK,最好是直接修改海康的C++demo,然后编译成可执行程序或者

动态库供python调用，下面的登录接口是python直接调用海康的SDK库进行登录的

海康的库主要放在lib下，在使用海康的库函数的时候，因为不知道该函数是在哪个库里面，所以我直接采用了

遍历库的办法去执行程序

import os
import ctypes
#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_uint16),
        ("bySupport3", ctypes.c_byte),
        ("byMultiStreamProto", ctypes.c_byte),
        ("byStartDChan", ctypes.c_byte),
        ("byStartDTalkChan", ctypes.c_byte),
        ("byHighDChanNum", ctypes.c_byte),
        ("bySupport4", ctypes.c_byte),
        ("byLanguageType", ctypes.c_byte),
        ("byVoiceInChanNum", ctypes.c_byte),
        ("byStartVoiceInChanNo", ctypes.c_byte),
        ("byRes3", ctypes.c_byte * 2),
        ("byMirrorChanNum", ctypes.c_byte),
        ("wStartMirrorChanNo", ctypes.c_uint16),
        ("byRes2", ctypes.c_byte * 2)]



#用户注册设备
def NET_DVR_Login_V30(sDVRIP = "192.168.1.63",wDVRPort = 8000,sUserName = "admin",sPassword = "guoji123"):
    init_res = callCpp("NET_DVR_Init")#SDK初始化
    if init_res:
        print("SDK初始化成功")
    else:
        error_info = callCpp("NET_DVR_GetLastError")
        print("SDK初始化错误：" + str(error_info))
        return False

    set_overtime = callCpp("NET_DVR_SetConnectTime",5000,4)#设置超时
    if set_overtime:
        print("设置超时时间成功")
    else:
        error_info = callCpp("NET_DVR_GetLastError")
        print("设置超时错误信息：" + str(error_info))
        return False

    #用户注册设备
    #c++传递进去的是byte型数据，需要转成byte型传进去，否则会乱码
    sDVRIP = bytes(sDVRIP,"ascii")
    sUserName = bytes(sUserName,"ascii")
    sPassword = bytes(sPassword,"ascii")
    DeviceInfo = LPNET_DVR_DEVICEINFO_V30()
    DeviceInfoRef = ctypes.byref(DeviceInfo)
    lUserID = callCpp("NET_DVR_Login_V30",sDVRIP,wDVRPort,sUserName,sPassword,DeviceInfoRef)
    print("登录结果："+str(lUserID))
    if lUserID == -1:
        error_info = callCpp("NET_DVR_GetLastError")
        print("登录错误信息：" + str(error_info))
        return error_info
    else:
        return lUserID

NET_DVR_Login_V30()