[Python知识库]ptthon调用海康sdk 数据类型

c++的 unsigned char指针，python格式为：POINTER(c_char)

ok的项目：百度网盘里，HikSDKyv12View

fRealDataCallBack_V30 = REALDATACALLBACK(_fRealDataCallBack_V30)

DECCALLBACK = CFUNCTYPE(None, c_long, POINTER(c_char), FRAME_INFO, c_long, c_long)


def _fDecCallBack(nPort, pBuf, nSize, pFrameInfo, nReserved1, nReserved2):
    print(nPort, nSize, pFrameInfo.nWidth)


fDecCallBack = DECCALLBACK(_fDecCallBack)


DISPLAYCALLBACK = CFUNCTYPE(None, c_long, POINTER(c_char), c_long, c_long, c_long, c_long, c_long, c_long)


def _fDisplayCallBack(nPort, pBuf, nSize, nWidth, nHeight, nStamp, nType, nReserved):
    print(nPort, nSize, nWidth, nHeight, nStamp, nType)
    bbb=string_at(pBuf,nSize)
    height=1080
    width=1920
    nparr = np.fromstring(bbb, np.uint8)
    img = nparr.reshape(height* 3 // 2, width)
    img2=cv2.cvtColor(img,cv2.COLOR_YUV2BGR_YV12)
    # yu12 = cv2.cvtColor(img2, cv2.COLOR_BGR2YUV_YV12)
    # print("time",time.time()-start)
    cv2.imshow("sadf",img2)
    cv2.waitKey(1)

fDisplayCallBack = DISPLAYCALLBACK(_fDisplayCallBack)