modularization/src/driver/driver_camera_ioctl/pythonusbcam.py

import ctypes
import time
import cv2 as cv
import numpy as np

mylib = ctypes.cdll.LoadLibrary("./libusb_cam_python.so")


char_arr100 = ctypes.c_char*10000000
y = char_arr100()

def showpic():
    str="hello"
    i = 0;
    nlenx = ctypes.c_int*2
    nlen = nlenx()
    mylib.StartCam("/dev/video0",1920,1080,30);
    while i< 10000:
    	nRtn = mylib.GetJPEGDataWithWait("/dev/video0",y,nlen,100);
#    	nRtn = mylib.GetJPEGData("/dev/video0",y,nlen);
        if(nRtn>0):
		xdata = np.frombuffer(y,count = nlen[0])
		matx = cv.imdecode(xdata, cv.IMREAD_COLOR );
		cv.imshow("showing",matx)
		cv.waitKey(1)
		print(time.time(), nRtn)
	else :
		print("no data");
		time.sleep(0.001);
		
    str="exit"
    print(str);


if __name__ == "__main__":
    print ('This is main ,for show pic from c++')
    showpic()