Socket Programming -- Sending image and received notice.

[salem alqahtani]

Hi there,

I am trying to do socket programming between client and server.
Client Side will send an image written in python and server side will received this image and store it. Then send ACK for the client.

I run in one error but because I am not programmer, I doubt my code structure. Also, I am using opencv on both sides.

This is my server code c++

#include <iostream>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>
#include <string>
#include <arpa/inet.h>
#include <string.h>
#include <stdio.h>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

using namespace std;
using namespace cv;

#define SERVER_PORT htons(50007)

int main() {

char buffer[1024];
int n;

int serverSock=socket(AF_INET, SOCK_STREAM, 0);

sockaddr_in serverAddr;
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = SERVER_PORT;
serverAddr.sin_addr.s_addr = INADDR_ANY;

/* bind (this socket, local address, address length)
bind server socket (serverSock) to server address (serverAddr).
Necessary so that server can use a specific port */
bind(serverSock, (struct sockaddr*)&serverAddr, sizeof(struct sockaddr));


// wait for a client
/* listen (this socket, request queue length) */
listen(serverSock,1);

sockaddr_in clientAddr;
socklen_t sin_size=sizeof(struct sockaddr_in);

int clientSock=accept(serverSock,(struct sockaddr*)&clientAddr, &sin_size);

while (1 == 1) {
bzero(buffer, 1024);

//char *buff = (char*)malloc(sizeof(char) * (240*360));
FILE *output;
output = fopen("test.jpg", "wb");
unsigned int readBytes = 0;
while(true)
{
int ret = recv(clientSock, buffer+readBytes, (240*360)-readBytes, 0);
if (ret <= 0)
{
break;
}
readBytes += ret;
}
fwrite(buffer, sizeof(char), readBytes, output);
fclose( output );

//Mat img_2 = imread( "test.jpg");

//receive a message from a client
n = read(clientSock, buffer, 500);
cout << "Confirmation code " << n << endl;
cout << "Server received: " << buffer << endl;

strcpy(buffer, "test");
n = write(clientSock, buffer, strlen(buffer));
cout << "Confirmation code " << n << endl;
}
return 0;
close(serverSock);
}

This is my client code python

import socket
import sys,os
import cv2
import numpy as np
import time

HOST, PORT = "localhost", 50007

client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

client_socket.connect((HOST, PORT))


fpath ='/Users/salemalqahtani/Desktop/NetworkingPart/sss.png'
pic = open(fpath, 'rb')
chunk = pic.read(1024)
client_socket.send(str.encode("STORE " + filePath))
t = time()
while chunk:
print("Sending Picture")
client_socket.send(chunk)
chunk = pic.read(1024)
pic.close()
print("Done sending")
print("Elapsed time = " + str(time() - t) + 's')
client_socket.close()
return "Done sending"

Please help me out.

[VictorN]

I run in one error but because I am not programmer, I doubt my code structure. Also, I am using opencv on both sides.

And what is that error?

[salem alqahtani]

This is the error in the python side

client_socket.send(chunk)
^
IndentationError: unindent does not match any outer indentation level

[salem alqahtani]

This is the error in the python side

client_socket.send(chunk)
^
IndentationError: unindent does not match any outer indentation level

Now I solved this issue but When I run the code on both client and server nothing happened and it said
client_socket.connect((HOST, PORT))
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/socket.py", line 228, in meth
return getattr(self._sock,name)(*args)
socket.error: [Errno 60] Operation timed out

[Richard.J]

I assume your server is not listening on port 50007, since you #define'd SERVER_PORT htons(50007).
You can verify this by using TcpView (or netstat) and check what port your server is listening on. Try omitting the 'htons' and see if this changes the behavior.

[ahoodin]

Hmmm well if you have never done socket programming before, I suggest starting simple. Don't try to run before you crawl.

Here is a good book on the subject:
http://www.amazon.com/Pocket-Socket-.../dp/1558606866

FYI You could FTP files from your client program to your server. This solution will probably be more robust if your trying to use it in a real business solution.