Question: (Closed) WindowsError: [Error 2] The system cannot find the file specified - python 2.7
gravatar for ezis98
5.6 years ago by
ezis980 wrote:


Im working on a server-client assignment in python.

The client can send 5 types of requests to the server:

  1. get the server's IP
  2. get contents of a directory on the server
  3. run cmd command on the server and get the output
  4. open a calculator on the server
  5. disconnect

my server manages to respond to all request, except for type-3 requests.

This is the error I get when i try to run a cmd command on the server code (line 32 on server):

"WindowsError: [Error 2] The system cannot find the file specified"

server code:

__author__ = 'eyal'

from struct import pack, unpack, calcsize
import socket
from os import listdir
from subprocess import check_output, call

def server():
    ser_soc = socket.socket()
    ser_soc.bind(("", 8080))
    while True:
        accept_flag = raw_input("Would you like to wait for a client? (y/n) ")
        if accept_flag == "y":
            client_soc, client_address = ser_soc.accept()
            while True:
                client_structs = client_soc.recv(1024)
                msg_type, data_len = unpack(">BH", client_structs[:calcsize(">BH")])
                if data_len > 0:
                    msg_data = unpack(str(data_len) + "s", client_structs[calcsize(">BH"):])
                if msg_type == 1:
                    ip = socket.gethostbyname(socket.gethostname())
                    to_send = pack(">BH" + str(len(ip)) + "s", msg_type, len(ip), ip)
                elif msg_type == 2:
                    content = listdir(msg_data[0])
                    content_str = "\r\n".join(content)
                    to_send = pack(">BH" + str(len(content_str)) + "s", msg_type,
                                   len(content_str), content_str)
                elif msg_type == 3:
                    command = str(msg_data).split()
                    output = check_output(command) #line32
                    to_send = pack(">BH" + str(len(output)) + "s", msg_type, len(output), output)
                elif msg_type == 4:
                    to_send = pack(">BH" + str(len("The calculator is open.")) + "s", msg_type,
                                   len("The calculator is open."), "The calculator is open.")
                elif msg_type == 5:
                    print "The client has disconnected."
                    to_send = pack(">BH" + str(len("invalid message type, try again")) + "s",
                                   msg_type, len("invalid message type, try again"),
                                   "invalid message type, try again")
                if msg_type != 5:

def main():

if __name__ == "__main__":


client code:

__author__ = 'eyal'

from struct import pack, unpack, calcsize
import socket

def client():
    my_soc = socket.socket()
    my_soc.connect(("", 8080))
    while True:
        send_flag = raw_input("Would you like to send the server a request? (y/n) ")
        if send_flag == "y":
            msg_code = input("What type of request would you like to send?\n"
                             "1. Get the server's IP address.\n"
                             "2. Get content of a directory on the server.\n"
                             "3. Run a cmd command on the server and get the output.\n"
                             "4. Open a calculator on the server.\n"
                             "5. Disconnect from the server.\n"
                             "Your choice: ")
            if msg_code == 1 or msg_code == 4 or msg_code == 5:
                to_send = pack(">BH", msg_code, 0)
            elif msg_code == 2:
                path = raw_input("Enter path of wanted directory to get content of: ")
                to_send = pack(">BH" + str(len(path)) + "s", msg_code, len(path), path)
            elif msg_code == 3:
                command = raw_input("Enter the wanted cmd command, including arguments: ")
                to_send = pack(">BH" + str(len(command)) + "s", msg_code, len(command), command)
                print "Invalid message code, try again\n"

            if 1 <= msg_code <= 5:
            if 1 <= msg_code < 5:
                data = my_soc.recv(1024)
                msg_code, msg_len = unpack(">BH", data[:calcsize(">BH")])
                msg_data = unpack(str(msg_len) + "s", data[calcsize(">BH"):])
                print "The server's response to your type-" + str(msg_code) + " request:"
                print msg_data[0]
            if msg_code == 5:
                print "You have disconnected from the server."

def main():

if __name__ == "__main__":

EDIT: Added position marker at line 32

python • 8.3k views
ADD COMMENTlink modified 5.6 years ago by RamRS30k • written 5.6 years ago by ezis980

Hello ezis98!

We believe that this post does not fit the main topic of this site.

Not a bioinformatics question. Please ask stackoverflow.

For this reason we have closed your question. This allows us to keep the site focused on the topics that the community can help with.

If you disagree please tell us why in a reply below, we'll be happy to talk about it.


ADD REPLYlink written 5.6 years ago by RamRS30k
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