Python调用海康sdk操作热成像设备获取对应点温度， 海康官方提供有Java版的sdk，遗憾的是里面提供的api比较旧了新版的api需要根据c++版的开发文档自己写对应的Python接口和类。这对于不熟悉c++的开发人员比较吃力。下面的代码示例了通过海康的SDK获取热成像画面上某一点的具体温度。hCNetSDK = CDLL('./libhcnetsdk.so')是海康sdk的目录，可以是相对路径也可以是绝对路径。

1.dll动态库python函数封装

from ctypes import c_int32, c_char_p, c_void_p, c_float, c_size_t, c_ubyte, c_long, cdll, POINTER, CDLL, c_bool, c_long, c_short
from hk_class import *
import sys

if 'linux' == sys.platform:
    hCNetSDK = CDLL('./libhcnetsdk.so')
else:
    hCNetSDK = CDLL('./HCNetSDK.dll')


SERIALNO_LEN = 48  # 序列号长度
NAME_LEN = 32  # 用户名长度

# //boolean NET_DVR_Init();
NET_DVR_Init = hCNetSDK.NET_DVR_Init
NET_DVR_Init.restype = c_bool
NET_DVR_Init.argtypes = ()

# boolean NET_DVR_Cleanup();
NET_DVR_Cleanup = hCNetSDK.NET_DVR_Cleanup
NET_DVR_Cleanup.restype = c_bool
NET_DVR_Cleanup.argtypes = ()

# NativeLong NET_DVR_Login_V30(String sDVRIP, short wDVRPort, String sUserName, String sPassword, NET_DVR_DEVICEINFO_V30 lpDeviceInfo);
NET_DVR_Login_V30 = hCNetSDK.NET_DVR_Login_V30
NET_DVR_Login_V30.restype = c_long
NET_DVR_Login_V30.argtypes = (c_char_p, c_short, c_char_p, c_char_p, POINTER(NET_DVR_DEVICEINFO_V30))

# boolean NET_DVR_Logout_V30(NativeLong lUserID);
NET_DVR_Logout_V30 = hCNetSDK.NET_DVR_Logout_V30
NET_DVR_Logout_V30.restype = c_bool
NET_DVR_Logout_V30.argtypes = (c_long,)

# boolean NET_DVR_SetSTDConfig(NativeLong lUserID, int dwCommand, NET_DVR_STD_CONFIG lpInConfigParam);
NET_DVR_SetSTDConfig = hCNetSDK.NET_DVR_SetSTDConfig
NET_DVR_SetSTDConfig.restype = c_bool
NET_DVR_SetSTDConfig.argtypes = (c_long, c_int32, NET_DVR_STD_CONFIG)

# boolean NET_DVR_GetSTDConfig(NativeLong lUserID, int dwCommand, NET_DVR_STD_CONFIG lpOutConfigParam);
NET_DVR_GetSTDConfig = hCNetSDK.NET_DVR_GetSTDConfig
NET_DVR_GetSTDConfig.restype = c_bool
NET_DVR_GetSTDConfig.argtypes = (c_long, c_int32, NET_DVR_STD_CONFIG)

# boolean NET_DVR_CaptureJPEGPicture_WithAppendData(NativeLong lUserID, int lChannel, NET_DVR_JPEGPICTURE_WITH_APPENDDATA lpJpegWithAppend);
NET_DVR_CaptureJPEGPicture_WithAppendData = hCNetSDK.NET_DVR_CaptureJPEGPicture_WithAppendData
NET_DVR_CaptureJPEGPicture_WithAppendData.restype = c_bool
NET_DVR_CaptureJPEGPicture_WithAppendData.argtypes = (c_long, c_int32, POINTER(NET_DVR_JPEGPICTURE_WITH_APPENDDATA))

# int NET_DVR_GetLastError();
NET_DVR_GetLastError = hCNetSDK.NET_DVR_GetLastError
NET_DVR_GetLastError.restype = c_int32
NET_DVR_GetLastError.argtypes = ()

# 启用日志文件写入接口
# boolean NET_DVR_SetLogToFile(int bLogEnable, String strLogDir, boolean bAutoDel);
NET_DVR_SetLogToFile = hCNetSDK.NET_DVR_SetLogToFile
NET_DVR_SetLogToFile.restype = c_bool
NET_DVR_SetLogToFile.argtypes = (c_int32, c_char_p, c_bool)


# 单帧数据捕获并保存成JPEG存放在指定的内存空间中。

# BOOL NET_DVR_CaptureJPEGPicture_NEW(
#   LONG                 lUserID,
#   LONG                 lChannel,
#   LPNET_DVR_JPEGPARA   lpJpegPara,
#   char                 *sJpegPicBuffer,
#   DWORD                dwPicSize,
#   LPDWORD              lpSizeReturned
# );
NET_DVR_CaptureJPEGPicture_new = hCNetSDK.NET_DVR_CaptureJPEGPicture_NEW
NET_DVR_CaptureJPEGPicture_new.restype = c_bool
NET_DVR_CaptureJPEGPicture_new.argtypes = (c_long, c_long, POINTER(NET_DVR_JPEGPARA), c_char_p, c_ulong, POINTER(c_ulong))

# BOOL NET_DVR_CaptureJPEGPicture_NEW(
#   LONG                 lUserID,
#   LONG                 lChannel,
#   LPNET_DVR_JPEGPARA   lpJpegPara,
#   char                 *sJpegPicBuffer,
#   DWORD                dwPicSize,
#   LPDWORD              lpSizeReturned
# );
NET_DVR_CaptureJPEGPicture = hCNetSDK.NET_DVR_CaptureJPEGPicture
NET_DVR_CaptureJPEGPicture.restype = c_bool
NET_DVR_CaptureJPEGPicture.argtypes = (c_long, c_long, POINTER(NET_DVR_JPEGPARA), c_char_p)

2.结构体python类封装

from ctypes import *

SERIALNO_LEN = 48  # 序列号长度
NAME_LEN = 32  # 用户名长度py

class NET_DVR_DEVICEINFO_V30(Structure):
    _fields_ = [('sSerialNumber', c_ubyte * SERIALNO_LEN), ('byAlarmInPortNum', c_byte), ('byAlarmOutPortNum', c_byte), ('byDiskNum', c_byte),
                ('byDVRType', c_byte), ('byChanNum', c_byte), ('byStartChan', c_byte), ('byAudioChanNum', c_byte), ('byIPChanNum', c_byte), ('byRes1', c_ubyte * 24)]

class NET_VCA_POINT(Structure):
    _fields_ = [('fX', c_float), ('fY', c_float)]

class NET_VCA_POLYGON(Structure):
    _fields_ = [('dwPointNum', c_ulong), ('struPos',NET_VCA_POINT * 10)] 

class NET_DVR_THERMOMETRY_PRESETINFO_PARAM(Structure):
    _fields_ = [('byEnabled', c_byte), ('byRuleID', c_short), ('wDistance', c_short), ('fEmissivity', c_float), ('byDistanceUnit', c_byte), ('byRes', c_ubyte * 2), ('byReflectiveEnabled', c_byte),
                ('fReflectiveTemperature', c_float), ('szRuleName', c_ubyte * NAME_LEN), ('byRes1', c_ubyte * 63), ('byRuleCalibType', c_byte), ('struPoint', NET_VCA_POINT), ('struRegion', NET_VCA_POLYGON)]

class NET_DVR_THERMOMETRY_PRESETINFO(Structure):
    _fields_ = [('dwSize', c_ulong), ('wPresetNo', c_short), ('byRes', c_ubyte * 2),
                ('struPresetInfo', NET_DVR_THERMOMETRY_PRESETINFO_PARAM * 40)]

class NET_DVR_THERMOMETRY_COND(Structure):
    _fields_ = [('dwSize', c_ulong), ('dwChannel', c_ulong),
                ('wPresetNo', c_short), ('byRes', c_ubyte * 62)]

class BYTE_ARRAY(Structure):
    _fields_ = [('byValue', c_byte * 2097152)]

class NET_DVR_STD_CONFIG(Structure):
    _fields_ = [('lpCondBuffer', POINTER(NET_DVR_THERMOMETRY_COND)), ('dwCondSize', c_ulong), ('lpInBuffer', POINTER(NET_DVR_THERMOMETRY_PRESETINFO)), ('dwInSize', c_ulong), ('lpOutBuffer', POINTER(NET_DVR_THERMOMETRY_PRESETINFO)), ('dwOutSize', c_ulong),
                ('lpStatusBuffer', POINTER(BYTE_ARRAY)), ('dwStatusSize', c_ulong), ('lpXmlBuffer', c_void_p), ('dwXmlSize', c_ulong), ('byDataType', c_bool), ('byRes', c_ubyte * 23)]

class NET_VCA_RECT(Structure):
    _fields_ = [('fX', c_char),('fY', c_char),('fWidth', c_char),('fHeight', c_char)]

class NET_DVR_JPEGPICTURE_WITH_APPENDDATA(Structure):
    _fields_ = [('dwSize', c_int32), ('dwChannel', c_int32), ('dwJpegPicLen', c_int32), ('pJpegPicBuff', POINTER(BYTE_ARRAY)), ('dwJpegPicWidth', c_int32),
                ('dwJpegPicHeight', c_int32), ('dwP2PDataLen', c_int32), ('pP2PDataBuff', POINTER(BYTE_ARRAY)), ('byIsFreezedata', c_byte), ('byRes', c_byte * 255)]

# JPEG图像信息结构体。

# struct{
#   WORD     wPicSize;
#   WORD     wPicQuality;
# }NET_DVR_JPEGPARA,*LPNET_DVR_JPEGPARA;

class NET_DVR_JPEGPARA(Structure):
    _fields_ = [('wPicSize', c_ulong),('wPicQuality', c_ulong)]

3.sdk自封装

import hk_dll as hk_dll
import hk_class as hk_class
from ctypes import *
import struct
# from numba import njit

# 设备信息
m_strDeviceInfo = None

SERIALNO_LEN = 48  # 序列号长度
NAME_LEN = 32  # 用户名长度py
point_bytes = (c_byte * 4)()

#用户登录信息

m_strDeviceInfo = None

#测温信息

m_strJpegWithAppenData = None

# 初始化


def init():
    return hk_dll.NET_DVR_Init()

# 登录


def login(ip, port, username, password):
    # 注册
    m_strDeviceInfo = hk_class.NET_DVR_DEVICEINFO_V30()
    m_strDeviceInfo.sSerialNumber = (c_ubyte * SERIALNO_LEN)()
    m_strDeviceInfo.byRes1 = (c_ubyte * 24)()

    lUserID = hk_dll.NET_DVR_Login_V30(bytes(ip), port, bytes(username), bytes(password), byref(m_strDeviceInfo))

    # 打开SDK写日志的功能
    hk_dll.NET_DVR_SetLogToFile(3, b'./sdklog', False)

    return lUserID

# 退出登录


def logout(lUserID):
    hk_dll.NET_DVR_Logout_V30(lUserID)

# 释放sdk


def cleanup():
    hk_dll.NET_DVR_Cleanup()

# 获取抓拍图片最高温度


def get_temperature_all(lUserID):

    ret, m_strJpegWithAppenData = get_temperature0(lUserID)
    max_temperature = -50
    min_temperature = 120

    byValue = m_strJpegWithAppenData.pP2PDataBuff.contents.byValue

    if ret:
        for x in range(m_strJpegWithAppenData.dwJpegPicWidth):
            for y in range(m_strJpegWithAppenData.dwJpegPicHeight):

                temperature = struct.unpack('<f', struct.pack('4b', *get_bytes(byValue , (m_strJpegWithAppenData.dwJpegPicWidth * y + x) * 4, 4)))[0]

                max_temperature = temperature if temperature > max_temperature else max_temperature
                min_temperature = temperature if temperature < min_temperature else min_temperature

        return True, max_temperature, min_temperature

    return False, max_temperature, min_temperature

# 获取给定点列表最高温度


def get_temperature_max(points, sourceWidth, sourceHeight, lUserID):

    ret, m_strJpegWithAppenData = get_temperature0(lUserID)

    if(len(points) < 2):
        return False, -2

    if ret:
        x1, y1 = point2point(points[0][0], points[0][1], sourceWidth, sourceHeight,
                             m_strJpegWithAppenData.dwJpegPicWidth, m_strJpegWithAppenData.dwJpegPicHeight)

        x2, y2 = point2point(points[1][0], points[1][1], sourceWidth, sourceHeight,
                             m_strJpegWithAppenData.dwJpegPicWidth, m_strJpegWithAppenData.dwJpegPicHeight)

        if x1 > x2 or y1 > y2:
            return False, -3

        byValue = m_strJpegWithAppenData.pP2PDataBuff.contents.byValue

        max_temperature = -50.0
        for x in range(x1, x2 + 1):
            for y in range(y1, y2 + 1):
                # 160 * 120
                temperature = struct.unpack('<f', struct.pack('4b', *get_bytes(byValue,  (m_strJpegWithAppenData.dwJpegPicWidth * y + x) * 4, 4)))[0]
                max_temperature = temperature if temperature > max_temperature else max_temperature

        return True, max_temperature

    return False, -1

# 获取某点的温度


def get_temperature(x, y, sourceWidth, sourceHeight, lUserID):

    ret, m_strJpegWithAppenData = get_temperature0(lUserID)

    if ret:
        # m_strJpegWithAppenData.pP2PDataBuff.contents.byValue
        x, y = point2point(x, y, sourceWidth, sourceHeight, m_strJpegWithAppenData.dwJpegPicWidth, m_strJpegWithAppenData.dwJpegPicHeight)
        byValue = m_strJpegWithAppenData.pP2PDataBuff.contents.byValue

        return True, struct.unpack('<f', struct.pack('4b', *get_bytes(byValue, (m_strJpegWithAppenData.dwJpegPicWidth * y + x) * 4, 4)))[0]

    return False, 0.0

# 截取指定下标的和长度的返回数据


def get_bytes(src_bytes, offset, length):
    global point_bytes

    for i in range(length):
        point_bytes[i] = src_bytes[offset + i]

    # del src_bytes

    return point_bytes


# 获取温度

def get_temperature0(lUserID):
    bRet = False
    global m_strJpegWithAppenData

    if m_strJpegWithAppenData is None:
        m_strJpegWithAppenData = hk_class.NET_DVR_JPEGPICTURE_WITH_APPENDDATA()
        m_strJpegWithAppenData.byRes = (c_byte * 255)()
        m_strJpegWithAppenData.dwChannel = 1
        m_strJpegWithAppenData.pJpegPicBuff = pointer(
            hk_class.BYTE_ARRAY((c_byte * 2097152)()))
        m_strJpegWithAppenData.pP2PDataBuff = pointer(
            hk_class.BYTE_ARRAY((c_byte * 2097152)()))
        m_strJpegWithAppenData.dwSize = sizeof(m_strJpegWithAppenData)

    bRet = hk_dll.NET_DVR_CaptureJPEGPicture_WithAppendData(lUserID, 2, byref(m_strJpegWithAppenData))

    if bRet:
        # 测温数据
        print(m_strJpegWithAppenData.dwP2PDataLen)
        if m_strJpegWithAppenData.dwP2PDataLen > 0:
            return True, m_strJpegWithAppenData

    return False, None

# 坐标转换
# @njit


def point2point(x, y, sourceWidth, sourceHeight, targetWidth, targetHeight):
    x = x * targetWidth / sourceWidth
    y = y * targetHeight / sourceHeight

    x = x if x <= targetWidth else targetWidth
    x = 0 if x < 0 else x

    y = y if y <= targetHeight else targetHeight
    y = 0 if y < 0 else y

    return int(x), int(y)

#抓拍图片
# lUserID 登录用户id
# lChannel 渠道号
# dir 文件保存路径
def captureJPEGPicture(lUserID, lChannel, dir):
    jpegpara= hk_class.NET_DVR_JPEGPARA()
    jpegpara.wPicSize = 0xff
    jpegpara.wPicQuality = 2

    p = c_char_p()
    s = byref(c_ulong())

    # return hk_dll.NET_DVR_CaptureJPEGPicture(lUserID, lChannel, byref(jpegpara), p, 2048, s)
    return hk_dll.NET_DVR_CaptureJPEGPicture(lUserID, lChannel, byref(jpegpara), dir)

def getLastError():
    return hk_dll.NET_DVR_GetLastError()

4.测试调用

import hk_sdk as hk_sdk
import hk_class as hkclass
import time


def test():
    result = hk_sdk.init()
    if not result:
        print('初始化失败')
        return False
    print('初始化成功')
    lUserIDs = []

    lUserID = hk_sdk.login(b"192.168.8.16", 8000, b'admin', b'a1234567')
    if lUserID != -1:
        print('lUserID ', lUserID)
        lUserIDs.append(lUserID)

    time.sleep(5)

    lUserID = hk_sdk.login(b"192.168.8.15", 8000, b'admin', b'a1234567')
    if lUserID != -1:
        print('lUserID ', lUserID)
        lUserIDs.append(lUserID)

    for i in range(10):
        temperature_list = [[0, 0], [255, 255]]

        # result, max_temperature, min_temperature = hk_sdk.get_temperature_all();

        # if not result:
        #     print("获取温度失败!")
        #     return False

        # print("max温度是" , max_temperature,"min温度是", min_temperature)
        userid = lUserIDs[int(i % 2)]
        result, temperature = hk_sdk.get_temperature_max(temperature_list, 1280, 720, userid)

        # result, temperature, m = hk_sdk.get_temperature_all();

        if result:
            print("获取的温度是", temperature, i)
        else:
            print("获取温度失败 ", userid)

        time.sleep(1)

    # 退出登录
    hk_sdk.logout(lUserIDs[0])

    # 释放
    hk_sdk.cleanup()


if __name__ == "__main__":
    test()

好了代码主要就这么多，喜欢的伙伴可以点赞留言加关注哦。