通过MV_CC_EnumDevices(tlayerType, device_list)搜索存在的设备。

获取设备信息cast(device_list.pDeviceInfo[int(show_device_num)], POINTER(MV_CC_DEVICE_INFO)).contents

创建句柄cam = MvCamera()

获得设备的句柄cam.MV_CC_CreateHandle(device_info)

打开设备cam.MV_CC_OpenDevice(MV_ACCESS_Exclusive, 0)

获得设备的参数存在MVCC_INTVALUE()这个结构里面，cam.MV_CC_GetIntValue(“PayloadSize”, camera_int_param) # 数据包大小

获取图片的存储大小，还有长度

image_data_size = (c_ubyte * camera_int_param.nCurValue)()
image_data_length = camera_int_param.nCurValue

开始抓流

grab_ret = cam.MV_CC_StartGrabbing()

图片信息存在下面的结构中

frame_info = MV_FRAME_OUT_INFO_EX()
memset(byref(frame_info), 0, sizeof(frame_info))

获取流

cam.MV_CC_GetOneFrameTimeout(image_data_size, image_data_length, frame_info, 1000)

将图片格式转一转

nRGBSize = frame_info.nWidth * frame_info.nHeight
convert_param = MV_CC_PIXEL_CONVERT_PARAM()
memset(byref(convert_param), 0, sizeof(convert_param))
convert_param.nWidth = frame_info.nWidth
convert_param.nHeight = frame_info.nHeight
convert_param.pSrcData = image_data_size
convert_param.nSrcDataLen = frame_info.nFrameLen
convert_param.enSrcPixelType = frame_info.enPixelType
convert_param.enDstPixelType = frame_info.enPixelType
convert_param.pDstBuffer = (c_ubyte * nRGBSize)()
convert_param.nDstBufferSize = nRGBSize
ret = cam.MV_CC_ConvertPixelType(convert_param)

img_buff = (c_ubyte * convert_param.nDstLen)()
cdll.msvcrt.memcpy(byref(img_buff), convert_param.pDstBuffer, convert_param.nDstLen)
img = np.array(img_buff, dtype=np.int8)
Img = img.reshape(1024, 1280)
Img = cv.flip(Img, -1)
Img = cv.flip(Img, -1)