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TypeError: str does not support buffer interface [duplicate]
(1 answer)
Closed 6 years ago.
import socket
serverName = "hostname"
serverPort = 12000
clientSocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
message = input('input lowercase sentence:')
clientSocket.sendto(message, (serverName, serverPort))
modifiedMessage, serverAddress = clientSocket.recvfrom(2048)
print (modifiedMessage)
clientSocket.close()
gives this error
Traceback (most recent call last):
File "C:/Python34/server1.py", line 11, in <module>
clientSocket.sendto(message, (serverName, serverPort))
TypeError: 'str' does not support the buffer interface
What do I do?
I've encode this code
import socket
serverName = "hostname"
serverPort = 12000
clientSocket = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
message = input('input lowercase sentence:').encode('ascii')
clientSocket.sendto(message,(serverName, serverPort))
modifiedMessage, serverAddress = clientSocket.recvfrom(2048)
print (modifiedMessage.decode('ascii'))
clientSocket.close()
But it still error
Traceback (most recent call last):
File "J:\Sistem Jaringan\Task I\client.py", line 11, in <module>
clientSocket.sendto(message,(serverName, serverPort))
socket.gaierror: [Errno 11004] getaddrinfo failed
How can i fix it?
Sockets sent bytes to the other end of the connection. Encode strings to bytes before trying to send. In the sendto method, change message to message.encode(). Add argument encoding='xyz' if you do not want the default utf-8 encoding. The modifiedMessage you receive will also be bytes, and you may want to decode it to a string.
Related
I am trying to get the expected value of a NumPy array but I am running into a problem when I pass my array into the function here is an example of what is happening:
a = np.ones(10)
stats.rv_continuous.expect(args=a)
I get this error:
Traceback (most recent call last):
File "<pyshell#3>", line 1, in <module>
stats.rv_continuous.expect(args=a)
TypeError: expect() missing 1 required positional argument: 'self'
If I try stats.rv_continuous.expect(a) , I get this error:
'numpy.ndarray' object has no attribute '_argcheck'
Can someone tell me how to get scipy.stats to work with an array?
update:
following bob's comment I changed the code to:
st=stats.rv_continuous()
ev = st.expect(args=signal_array)
print(ev)
where signal_array is a numpy array. However I now get this error:
Traceback (most recent call last):
File "C:\Users\...\OneDrive\Área de Trabalho\TickingClock\Main.py", line 35, in <module>
ev = st.expect(args=signal_array)
File "C:\Users\...\AppData\Local\Programs\Python\Python39\lib\site-packages\scipy\stats\_distn_infrastructure.py", line 2738, in expect
vals = integrate.quad(fun, lb, ub, **kwds)[0] / invfac
File "C:\Users\...\AppData\Local\Programs\Python\Python39\lib\site-packages\scipy\integrate\quadpack.py", line 351, in quad
retval = _quad(func, a, b, args, full_output, epsabs, epsrel, limit,
File "C:\Users\...\AppData\Local\Programs\Python\Python39\lib\site-packages\scipy\integrate\quadpack.py", line 465, in _quad
return _quadpack._qagie(func,bound,infbounds,args,full_output,epsabs,epsrel,limit)
File "C:\Users\...\AppData\Local\Programs\Python\Python39\lib\site-packages\scipy\stats\_distn_infrastructure.py", line 2722, in fun
return x * self.pdf(x, *args, **lockwds)
File "C:\Users\...\AppData\Local\Programs\Python\Python39\lib\site-packages\scipy\stats\_distn_infrastructure.py", line 1866, in pdf
args, loc, scale = self._parse_args(*args, **kwds)
TypeError: _parse_args() got multiple values for argument 'loc'
I am very new to socket and communication using MQTT. Already spent hours but dont know what is wrong. Kindly help me to fix this error.
I am using the below code,
import socket
import json
from random import randint
from inference import Network
import paho.mqtt.client as mqtt
HOSTNAME = socket.gethostname()
IPADDRESS = socket.gethostbyname(HOSTNAME)
MQTT_HOST = IPADDRESS
MQTT_PORT = 1883 ### TODO: Set the Port for MQTT
MQTT_KEEPALIVE_INTERVAL = 60
client = mqtt.Client()
client.connect(MQTT_HOST,MQTT_PORT,MQTT_KEEPALIVE_INTERVAL)
And the error and traceback is shown below,
(venv) root#119d16139409:/home/workspace# python app.py | ffmpeg -v warning -f rawvideo -pixel_format bgr24 -video_size 1280x720 -framerate 24 -i - http://0.0.0.0:3004/fac.ffm
Traceback (most recent call last):
File "app.py", line 145, in <module>
main()
File "app.py", line 141, in main
infer_on_video(args, model)
File "app.py", line 74, in infer_on_video
client.connect(MQTT_HOST,MQTT_PORT,MQTT_KEEPALIVE_INTERVAL)
File "/opt/intel/openvino_2019.3.376/deployment_tools/model_optimizer/venv/lib/python3.5/site-packages/paho/mqtt/client.py", line 937, in connect
return self.reconnect()
File "/opt/intel/openvino_2019.3.376/deployment_tools/model_optimizer/venv/lib/python3.5/site-packages/paho/mqtt/client.py", line 1071, in reconnect
sock = self._create_socket_connection()
File "/opt/intel/openvino_2019.3.376/deployment_tools/model_optimizer/venv/lib/python3.5/site-packages/paho/mqtt/client.py", line 3522, in _create_socket_connection
return socket.create_connection(addr, source_address=source, timeout=self._keepalive)
File "/usr/lib/python3.5/socket.py", line 711, in create_connection
raise err
File "/usr/lib/python3.5/socket.py", line 702, in create_connection
sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused
I am trying to send video from raspberry pi to my laptop via laptop
and save them as pictures so i found the below code online
but I get the following errors when I run them
so i run this client code on the pi using Thonny ide that comes preloaded
, I apologize for the way code is formatted below and would be very grateful if anybody can help me sort this out
Server on the laptop is run using python 3.6 idle
import sys
import numpy as np
import cv2
import socket
class VideoStreamingTest(object):
def __init__(self):
self.server_socket = socket.socket()
self.server_socket.bind(('0.0.0.0', 9006))
self.server_socket.listen(0)
self.connection, self.client_address = self.server_socket.accept()
self.connection = self.connection.makefile('rb')
self.streaming()
def streaming(self):
try:
print("Connection from: ", self.client_address)
print("Streaming...")
print("Press 'q' to exit")
stream_bytes = ' '
while True:
stream_bytes += self.connection.read(1024)
first = stream_bytes.find('\xff\xd8')
last = stream_bytes.find('\xff\xd9')
if first != -1 and last != -1:
jpg = stream_bytes[first:last + 2]
stream_bytes = stream_bytes[last + 2:]
#image = cv2.imdecode(np.fromstring(jpg, dtype=np.uint8), cv2.CV_LOAD_IMAGE_GRAYSCALE)
image = cv2.imdecode(np.fromstring(jpg, dtype=np.uint8), cv2.CV_LOAD_IMAGE_UNCHANGED)
cv2.imshow('image', image)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
finally:
self.connection.close()
self.server_socket.close()
if __name__ == '__main__':
VideoStreamingTest()
I get the following error
Connection from: ('192.168.43.3', 47518)
Streaming...
Press 'q' to exit
Traceback (most recent call last):
File "C:\Users\John Doe\d-ff\Desktop\AutoRCCar-master
3\test\stream_server_test.py", line 46, in <module>
VideoStreamingTest()
File "C:\Users\John Doe\d-ff\Desktop\AutoRCCar-master
3\test\stream_server_test.py", line 16, in __init__
self.streaming()
File "C:\Users\John Doe\d-ff\Desktop\AutoRCCar-master
3\test\stream_server_test.py", line 28, in streaming
stream_bytes += self.connection.read(1024)
TypeError: must be str, not bytes
Client side on the pi
import io
import socket
import struct
import time
import picamera
# create socket and bind host
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect(('ToM', 9006))
connection = client_socket.makefile('wb')
try:
with picamera.PiCamera() as camera:
camera.resolution = (320, 240) # pi camera resolution
camera.framerate = 5 # 10 frames/sec
time.sleep(2) # give 2 secs for camera to initilize
start = time.time()
stream = io.BytesIO()
# send jpeg format video stream
for foo in camera.capture_continuous(stream, 'jpeg', use_video_port = True):
connection.write(struct.pack('<L', stream.tell()))
connection.flush()
stream.seek(0)
connection.write(stream.read())
if time.time() - start > 600:
break
stream.seek(0)
stream.truncate()
connection.write(struct.pack('<L', 0))
finally:
connection.close()
client_socket.close()
I get the following error
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/pi/Desktop/stream_client.py", line 40, in <module>
connection.close()
File "/usr/lib/python3.5/socket.py", line 594, in write
return self._sock.send(b)
BrokenPipeError: [Errno 32] Broken pipe
I first thought it might be because of the limited bandwidth since i was running vnc viewer (remote desktop) via wifi on the pi but I don't think it is
I also had same problem. After some searching I found solution.
In python 3 we have to specify whether string is regular string or binary.Thats why we use b'string' instead of just 'string'
Change
stream_bytes = ' '
to
stream_bytes = b' '
Also change
first = stream_bytes.find('\xff\xd8')
last = stream_bytes.find('\xff\xd9')
to
first = stream_bytes.find(b'\xff\xd8')
last = stream_bytes.find(b'\xff\xd9')
Note that you are using cv2.CV_LOAD_IMAGE_UNCHANGED which is not available in opencv3.0
Use cv2.IMREAD_COLOR to show image in color.
Edit these changes and your stream should run smoothly.
connection.write(struct.pack('<L', 0))
Check out by inserting the above within try
I have the below code that i am trying the run using python3.2 interpreter.
import socket #for sockets
import sys #for exit
#from UserString import MutableString
#create an INET, STREAMing socket
try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
except socket.error:
print ('Failed to create socket')
sys.exit()
print ('Socket Created')
host = 'www.google.com';
port = 80;
try:
remote_ip = socket.gethostbyname( host )
except socket.gaierror:
#could not resolve
print ('Hostname could not be resolved. Exiting')
sys.exit()
#Connect to remote server
s.connect((remote_ip , port))
print ('Socket Connected to ' + host + ' on ip ' + remote_ip)
#Send some data to remote server
message = "GET / HTTP/1.0\r\n\r\n"
try :
#Set the whole string
s.sendall(message.encode())
except socket.error:
#Send failed
print ('Send failed')
sys.exit()
print ('Message send successfully')
#Now receive data
messageParts = []
remaining = 4096
chunk = s.recv(remaining)
messageParts.append(chunk)
while (len(chunk) > 0):
chunk = s.recv(remaining)
messageParts.append(chunk.decode())
finalMessage = b"".join(messageParts)
print('Printing the html contents ...')
print(finalMessage)
Upon running the above code, with python version 3.2, i get the below error:
Socket Created
Socket Connected to www.google.com on ip 74.125.201.147
Message send successfully
Traceback (most recent call last):
File "TestMainServerV2.py", line 73, in <module>
finalMessage = b"".join(messageParts)
TypeError: sequence item 1: expected bytes, str found
Could anybody let me know what is the issue?
Thanks!
messageParts.append(chunk.decode())
is appending strs to messageParts.
chunk = s.recv(remaining)
messageParts.append(chunk)
is appending bytes to messageParts. (Everything that comes through a socket is bytes so chunk is a bytes object.)
Especially in Python3, one should never mix strs and bytes.
b"".join(messageParts)
raises a TypeError since b"".join expects only bytes.
You can avoid the problem by not decoding chunk. Use
messageParts.append(chunk)
instead of
messageParts.append(chunk.decode())
EDIT: I solved this question myself, look at the first answer if you have a similar issue
I am new to sockets and made a client-server test modifying one example, it sends and receives data ok but when closing the server get caught in a loop receiving blank messages and I can't find out why even though I use shutdown(socket.SHUT_RDWR) to close the connection immediately according to the documentation.
I had to use two cmd of windows for each one (server and client) because when running first the server in idle and then the client I got in client_example ConnectionRefusedError: [WinError 10061] No connection could be made because the target machine actively refused it here is the code. Anyways, here it is the sequence I tried:
(in the client console):
c:\python33\python client_example.py
SEND( TYPE q or Q to Quit):Hi
SEND( TYPE q or Q to Quit):q
(in the server console):
c:\python33\python server_example3.py
TCPServer Waiting for client on port 7000
I got a connection from ('127.0.0.1', 49263)
RECEIVED: b'Hi'
RECEIVED: b''
RECEIVED: b''
RECEIVED: b''
RECEIVED: b''
RECEIVED: b''
.... <---After I did CTRL+C
Traceback (most recent call last):
File "server_example.py", line 19, in <module>
print("RECEIVED:",data)
File "c:\python33\lib\encodings\cp850.py", line 19, in encode
return codecs.charmap_encode(input,self.errors,encoding_map)[0]
KeyboardInterrupt
Here is the code of the server and client:
server_example.py:
#TCP server example
import socket
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.bind(("", 7000))
server_socket.listen(5)
print("TCPServer Waiting for client on port 7000")
while 1:
client_socket, address = server_socket.accept()
print("I got a connection from ", address)
while 1:
data = client_socket.recv(32)
if (data == 'q' or data == 'Q'):
client_socket.shutdown(socket.SHUT_RDWR)
client_socket.close()
break;
else:
print("RECEIVED:",data)
client_example.py:
# TCP client example
import socket
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect(("localhost", 7000))
while 1:
data = input( "SEND( TYPE q or Q to Quit):" )
if (data != 'Q' and data != 'q'):
my_bytes = bytearray()
for c in data:
my_bytes.append(ord(c))
client_socket.send(my_bytes)
else:
client_socket.shutdown(socket.SHUT_RDWR)
client_socket.close()
break;
Well, I feel dumb that I solved this thing after 11 minutes of posting the question when I was unable to solve it for 2 hours...
The problem was that I was comparing data with the string 'q' which was correct in python 2 but in python 3 what is being sent are bytes, b'q' <> 'q' ...
Here is the corrected code:
server_example.py
#TCP server example
import socket
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.bind(("", 7000))
server_socket.listen(5)
print("TCPServer Waiting for client on port 7000")
while 1:
client_socket, address = server_socket.accept()
print("I got a connection from ", address)
while 1:
data = client_socket.recv(32)
print("RECEIVED:",data)
if (data == b'q' or data == b'Q'):
## client_socket.shutdown(socket.SHUT_RDWR)
client_socket.close()
break;
break;
client_example.py
# TCP client example
import socket
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect(("localhost", 7000))
while 1:
data = input( "SEND( TYPE q or Q to Quit):" )
if (data != 'Q' and data != 'q'):
my_bytes = bytearray()
for c in data:
my_bytes.append(ord(c))
client_socket.send(my_bytes)
else:
my_bytes = bytearray()
my_bytes.append(ord(data))
client_socket.send(my_bytes)
## client_socket.shutdown(socket.SHUT_RDWR)
client_socket.close()
break;
You're assuming you're going to get the Q. You should also engage in the same processing when you get EOS from read, whatever form that takes in Python.
#EJP : By EOS you mean end of stream? If so you are right, this example was a very simple one to get started in which I overlooked details like these.
Anyway I found that using this check in the server it is solved:
data = input( "SEND( TYPE q or Q to Quit):" )
if (data == b''):
break;