CODEWITHSUNDEEP
pythonsockets
Xinus
Xinus

Reputation: 30533

Error trying to pass (large) image over socket in python

I am trying to pass an image over python socket for smaller images it works fine but for larger images it gives error as

socket.error: [Errno 10040] A message sent on a datagram socket was larger than the internal message buffer or some other network limit, or the buffer used to receive a datagram into was smaller than the datagram itself

I am using 

socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

Thanks for any clue .

I tried using SOCK_STREAM, it does not work .. It just says me starting ... and hangs out . with no output .. Its not coming out of send function

import thread
import socket
import ImageGrab

class p2p:
    def __init__(self):
        socket.setdefaulttimeout(50)
        #send port
        self.send_port = 3000
        #receive port
        self.recv_port=2000

        #OUR IP HERE
        self.peerid = '127.0.0.1:'
        #DESTINATION 
        self.recv_peers = '127.0.0.1'

        #declaring sender socket
        self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM )
        self.socket.bind(('127.0.0.1', self.send_port))
        self.socket.settimeout(50)

        #receiver socket
        self.serverSocket=socket.socket(socket.AF_INET, socket.SOCK_STREAM )
        self.serverSocket.bind(('127.0.0.1', self.recv_port))
        self.serverSocket.settimeout(50)

        #starting thread for reception
        thread.start_new_thread(self.receiveData, ())

        #grabbing screenshot
        image = ImageGrab.grab()
        image.save("c:\\test.jpg")
        f = open("c:\\ test.jpg", "rb")
        data = f.read()
        #sending
        self.sendData(data)
        print 'sent...'
        f.close()

        while 1: pass

    def receiveData(self):
        f = open("c:\\received.png","wb")
        while 1:
            data,address = self.serverSocket.recvfrom(1024)
            if not data: break
            f.write(data)
        try:
            f.close()
        except:
            print 'could not save'
        print "received"
    def sendData(self,data):
        self.socket.sendto(data, (self.recv_peers,self.recv_port))
if __name__=='__main__':
    print 'Started......'    
    p2p()

Upvotes: 1

Views: 9843

Answers (3)

Eric Shen
Eric Shen

Reputation: 1

data,address = self.serverSocket.recvfrom(1024)  <<<  increase this

Upvotes: 0

sth
sth

Reputation: 229633

Your image is too big to be sent in one UDP packet. You need to split the image data into several packets that are sent individually.

If you don't have a special reason to use UDP you could also use TCP by specifying socket.SOCK_STREAM instead of socket.SOCK_DGRAM. There you don't have to worry about packet sizes and ordering.

Upvotes: 5

Mark Rushakoff
Mark Rushakoff

Reputation: 258228

The message you are sending is being truncated.

Since you haven't shown the actual code that sends, I'm guessing you are trying to write the entire image to the socket. You'll have to break the image into several, smaller chunks.

Upvotes: 2

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