I'm making socket communication using Raspberry Pi and Python, but there's a blockage.

You want to create a socket communication that sends a picture to the server as soon as you take a picture with a button in Raspberry.

I'm still a beginner, so I wrote the following code with the information I got from searching here and there.

Photography and camera shutdown work, but the transfer is blocked immediately after taking the picture.

So I keep changing the call position of the transfer function, but it hasn't been solved, so I'm asking you a question

The code below is the client code, and it says that the picture needed for the transfer at runtime is not stored in the directory, but I don't know how to change the order.

I would appreciate it if you could point out other problems in the code.

# TCP client
#-*-coding: utf-8-*-

#-*-coding: euc-kr-*-


import socket
import sys
import os
import time
import picamera
import RPi.GPIO as GPIO
import datetime



GPIO.setmode(GPIO.BCM)
GPIO.setup(21, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(20, GPIO.IN, pull_up_down=GPIO.PUD_UP)

def fileName():
    dte = time.localtime()
    Year = dte.tm_year
    Mon = dte.tm_mon
    Day = dte.tm_mday
    WDay = dte.tm_wday
    Hour = dte.tm_hour
    Min = dte.tm_min
    Sec = dte.tm_sec
    imgFileName = str(Year) + '_' + str(Mon) + '_' + str(Day) + '_' + str(Hour) + '_' + str(Min) + '_' + str(
        Sec) + '.jpg';
    return imgFileName

print("Start Camera App")

# # Server File Path
src = "C:\\Users\\HJ_2\\Desktop\\programming\\save\\";


def transfer(filename):
    capture_file_name = "/home/pi/Desktop/picture/" + str(saveFileName) + ".jpg"

    # # 3 Send File

    # # Import img  (path/name)
    file = open(capture_file_name, "rb")
    img_size = os.path.getsize(capture_file_name)
    img = file.read(img_size)  # saved image
    file.close()

    # # connect server
    client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    client_socket.connect(("192.168.0.6", 5001))

    # # image tramsfer
    client_socket.sendall(img)

    # # Terminate connection with server
    client_socket.close()
    print("Finish SendAll")

with picamera.PiCamera() as camera:
    camera.resolution = (640,480)
    camera.rotation = 0
    camera.framerate = 24
    camera.start_preview(fullscreen=False, window=(150,50,640,480))
    frame = 1
    while True:
        GPIO.wait_for_edge(21, GPIO.FALLING)
        saveFileName = fileName()
        camera.capture('/home/pi/Desktop/picture/' + saveFileName + '_%03d.jpg' %frame)
        fileName_list = [saveFileName]
        if saveFileName in fileName_list:
            transfer(saveFileName)
            time.sleep(3)
        frame += 1

while GPIO.input(20):
    camera.annotate_text = ''

print("App Stop")

camera.stop_preview()
camera.close()
GPIO.cleanup()

When executing the code above, the message below appears.

Traceback (most recent call last):
File "last_2.py", line 76, in <module>
transfer(saveFileName)
File "last_2.py", line 48, in transfer
 file = open(capture_file_name, "rb")
IOError: [Errno 2] No such file or directory: '/home/pi/Desktop/picture/2019_10_29_17_6_44.jpg.jpg

python raspberry-pi

2022-09-22 19:25

1 Answers

Read the error message carefully.

No such file or directory: '/home/pi/Desktop/picture/2019_10_29_17_6_44.jpg.jpg

It says there are no files or directories named above.

This file name is

def transfer(filename):
    capture_file_name = "/home/pi/Desktop/picture/" + str(saveFileName) + ".jpg"

    # # 3 Send File

    # # Import img  (path/name)
    file = open(capture_file_name, "rb")

This is the capture_file_name of the above code. This file name is different from the saved file name.

The code for saving is

camera.capture('/home/pi/Desktop/picture/' + saveFileName + '_%03d.jpg' %frame)

There seems to be a difference.

There seems to be a lot of other problems, but if I just tell you what you see at the top,

#-*-coding: utf-8-*-

#-*-coding: euc-kr-*-

The above means that the source file is a file encoded with utf-8 character set encoding. The second is that the source file is encoded in euc-kr. Neither of them is valid. In Python 3 version, you don't need to lose it, just save the sauce to utf-8. During the text transmission process, I think I saw the wrong blog post somewhere and put it in because of the encoding problem, but it doesn't matter. When transmitting, the character must be specified with the desired encoding and explicitly encoded with s.code('utf-8') to obtain a binary before being thrown.

2022-09-22 19:25

If you have any answers or tips

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