I am trying to build a simple gui including a qr-code reader to send data to a remote server in python on Ubuntu for a school-project. I have set up a simple server to receive messages from the scanner via tcp/ip:
import socketfrom Crypto.Cipher import AESdef main(): # Server mit gegebener Adresse starten server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server.bind(("192.168.1.40", 9999)) server.listen() while True: client, address = server.accept() msg = client.recv(1024).decode('ASCII') print(msg) if __name__ == '__main__': main()If I run a simple test client all messages are received:
import socketclient = socket.socket()try: client.connect(("192.168.1.40",9999)) for i in range(1,10): client.send("\nHallo Server, ich bin dein Client und will was\n".encode('ASCII'))except: print("Server nicht verfügbar\n\n")and I get 9 messages printed row by row on the server.
The actual gui is
import PySimpleGUI as sgfrom pyzbar import pyzbarimport cv2import osimport socketimport mathfrom time import time, sleepfrom Crypto.Cipher import AESH1 = 0def read_qr(): vid = cv2.VideoCapture(0) qr = False while(not qr): ret, frame = vid.read() qr = pyzbar.decode(frame) duration = .1 freq = 3000 os.system('play -nq -t alsa synth {} sine {}'.format(duration,freq)) qr = qr[0].data.decode().split(':::') vid.release() cv2.destroyAllWindows() return qr def si_msg(body): global H1 H1 += 1 H2 = socket.gethostname().split('-')[2] H3 = 0 H5, H4 = math.modf(time()) H6 = 2 H7 = len(body.encode('ASCII')) si_msg = " ".join([str(H1), H2, str(H3), str(int(H4)), str(int(H5*10**8)), str(H6), str(H7), body]) return si_msgdef main(): sg.theme('PythonPlus') status = 'Verbindung getrennt' socket.setdefaulttimeout(2.5) client = socket.socket(socket.AF_INET, socket.SOCK_STREAM) layout = [ [sg.Text('Server-Adresse:'),sg.Input(key = 'k_server', default_text='192.168.1.40:9999')], [sg.Button('Server bestätigen')], [sg.Text('Status:'), sg.Text(status, key = 'k_status')], [sg.Exit()]] window = sg.Window('Virtueller Login', layout) while True: event, values = window.read() if event == sg.WIN_CLOSED or event == 'Exit': break elif event == 'Server bestätigen': status = 'Verbindung zum Server wird hergestellt' window['k_status'].update(status) server = values['k_server'].split(':') try: client.connect((server[0],int(server[1]))) status = 'Verbindung hergestellt: ausgeloggt' window['k_status'].update(status) except: status = 'Verbindungsversuch fehlgeschlagen' window['k_status'].update(status) sg.popup('FEHLER: Server nicht gefunden. Bitte prüfen Sie die Adresse oder wenden Sie sich an den Administrator') continue window.start_thread(lambda: read_qr(), 'Code gefunden') if event == 'Code gefunden': qr = values[event][0] msg = si_msg(qr) print(msg) client.send(msg.encode('ASCII')) sleep(2) client.close() window.close()if __name__ == '__main__': main()Running this main enables me to scan a qr-code/ barcode, which is successfully wrapped in the header (I have to make this ugly thing) and printed for each scan, iterating the scan-counter H1 with each scan. I am not getting any errors on client or server, but the server only receives the first scan.
To make sure it has nothing to do with the multithreading handled by pysimplegui I have omitted the lines
window.start_thread(lambda: read_qr(), 'Code gefunden')if event == 'Code gefunden': qr = values[event][0] msg = si_msg(qr) print(msg) client.send(msg.encode('ASCII')) sleep(2)and replaced them with a direct scan command (freezing the gui):
qr = read_qr()[0]msg = si_msg(qr)print(msg)client.send(msg.encode('ASCII'))This let's me enable the connection, scan the code, send the message and then the loop seems to stop working and I can not scan anymore. I can press the connect-button of the gui a second time, thus "reconnecting" to the server (which was never disconnected?) scan again, but it wont send a message to the server and won't establish the connection a third time.
Alternatively, simply adding a second message manually does also not get send, this does not work either:
qr = read_qr()[0]msg = si_msg(qr)print(msg)client.send(msg.encode('ASCII'))sleep(0.5)msg = si_msg(qr)print(msg)client.send(msg.encode('ASCII'))The counter iterates and is printed, but no second message is send, the connection seems lost, i can reconnect, scan again (without sending any of those messages) and that's it, again no third chance.
As I don't get any errors I am somewhat lost on this. I don't think it has anything to do with pysimplegui, as the consecutive manual messages don't get send either, but I have no Idea and would be happy for any help...
