[Dharmit]

Hi,

I am trying to run the program on page 276 on the android emulator. I am getting an error saying "<ulropen error [Error 111] Connection Refused>". I googled the error. As per the explanation on this link it happens if server is not running.

I am attaching the screenshot of the emulator and the command prompt. Can someone help out??

Dharmit

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[paulbarry]

Please see http://forums.oreill...hings-go-wrong/ for a discussion of common issues with this chapter's material. Can you check that your Android code is trying to contact the IP address of your computer and not 127.0.0.1 (which is one of the IP addresses of the Android emulator). Cheers. --Paul.

[Dharmit]

paulbarry, on 26 July 2011 - 12:19 AM, said:

Please see http://forums.oreill...hings-go-wrong/ for a discussion of common issues with this chapter's material. Can you check that your Android code is trying to contact the IP address of your computer and not 127.0.0.1 (which is one of the IP addresses of the Android emulator). Cheers. --Paul.

I changed the ip address to that of the computer I am coding upon. On the emulator's browser, the ip address i.e. 192.168.1.8:8080 opens up the Coach Kelly homepage.

From the link that you gave me, I changed the

from urllib2 import urlopen

to

from urllib import urlopen

Now I get a new kind of error which I am attaching with the post.

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[paulbarry]

You are almost there... in the bottom left-hand corner of your graphic, you have a typo in your code. It should read "DialogShow()". --Paul.

[Dharmit]

paulbarry, on 26 July 2011 - 03:41 AM, said:

You are almost there... in the bottom left-hand corner of your graphic, you have a typo in your code. It should read "DialogShow()". --Paul.

That was a dumb typo on my part. I corrected it. Later I tried to execute the script. But now I have an error saying, "No JSON object decoded". I googled it but couldn't find something that would help me. On stackoverflow one person with similar problem had forgot to do

urlopen.read()

which I guess is not an issue with the code in the book as we are doing

page.read().decode("utf-8")

I have attached the screenshot in such a way that you can also take a look at the entire code.

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[paulbarry]

This can sometimes occur when the server doesn't have any data to send which will result in the JSON decoder complaining. It might be an idea to add some strategically placed print statements to see what's going on (both within your server code and within this code). --Paul.

[Dharmit]

paulbarry, on 27 July 2011 - 07:55 AM, said:

This can sometimes occur when the server doesn't have any data to send which will result in the JSON decoder complaining. It might be an idea to add some strategically placed print statements to see what's going on (both within your server code and within this code). --Paul.

Paul, I fail to understand what I should do in order to proceed further. I am stuck on this page since quite a few days. All I could think of after reading your reply was

def send_to_server(url, post_data = None):
    if post_data:
        page = urlopen(url, urlencode(post_data))
        print ("If")
    else:
        page = urlopen(url)
        print ("Else")
    return (page.read().decode("utf-8"))

I have added print statements here. As expected it prints "Else" and then the same error message. In the generate_names.py I couldn't understand where to add the print statement. I added a print statement and now my generate_names.py file looks like

import json
import athletemodel
import yate

print "Hello"
names = athletemodel.get_names_from_store()

print(yate.start_response('application/json'))
print(json.dumps(sorted(names)))

But Hello doesn't get printed on the screen. I am not sure if I did the right thing but somehow I feel it's not gonna be right.

[paulbarry]

In the server code, add:

import sys

to the top of the file, then add:

print('The data was: ' + names, file=sys.stderr)

before the 2 print calls at the bottom of the code. Remove your call to print 'Hello' (which is not valid Python 3 code anyway).

What this will do is spit up a message on the web server's console screen (not the web browser window) and display the result of the server attempting to create the data to send to the phone. If there's no data displayed in the console window, then that's your problem - the data files are missing. If the data is there, then there's some other problem. Note that the code on the phone should be *exactly* as displayed in the book (no matter what other Google searches may tell you).

Try that and see what happens.

--Paul.

[Dharmit]

paulbarry, on 28 July 2011 - 04:53 AM, said:

In the server code, add:

import sys

to the top of the file, then add:

print('The data was: ' + names, file=sys.stderr)

before the 2 print calls at the bottom of the code. Remove your call to print 'Hello' (which is not valid Python 3 code anyway).

What this will do is spit up a message on the web server's console screen (not the web browser window) and display the result of the server attempting to create the data to send to the phone. If there's no data displayed in the console window, then that's your problem - the data files are missing. If the data is there, then there's some other problem. Note that the code on the phone should be *exactly* as displayed in the book (no matter what other Google searches may tell you).

Try that and see what happens.

--Paul.

If I keep the code exactly as it is in the book, it would be

from urllib2 import urlopen

It gives me 404 Error page. And if I keep

from urllib import urlopen

it gives me Json object could not be decoded error.

The error I get on the console is attached with the post. It's again a 404 error. Opening 192.168.1.9:8080 on my desktop on which server is running lists C: of the machine. Why does it do so? The command that I run is

C:\Python32\python.exe E:\hfpython\my_hfp_code\chapter8\webapp\simple_httpd.py

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[paulbarry]

OK, I think I see an issue. The command-line you are using is this one:

C:\Python32\python.exe E:\hfpython\my_hfp_code\chapter8\webapp\simple_httpd.py

which runs the simple_httpd.py script in "E:\hfpython\my_hfp_code\chapter8\webapp\", right? In order for the web server to find the CGI script and its data, it needs to run relative to the folder that contains the simple_httpd.py code. So, at your command-prompt, do this:

cd E:\hfpython\my_hfp_code\chapter8\webapp\

then issue this command:

C:\Python32\python.exe simple_httpd.py

Now when the web server runs, it'll find the data as well as the CGI script in the same folder as the simple_httpd.py program.

Try that and let's see what happens...

--Paul.

[Dharmit]

paulbarry, on 29 July 2011 - 12:10 AM, said:

OK, I think I see an issue. The command-line you are using is this one:

C:\Python32\python.exe E:\hfpython\my_hfp_code\chapter8\webapp\simple_httpd.py

which runs the simple_httpd.py script in "E:\hfpython\my_hfp_code\chapter8\webapp\", right? In order for the web server to find the CGI script and its data, it needs to run relative to the folder that contains the simple_httpd.py code. So, at your command-prompt, do this:

cd E:\hfpython\my_hfp_code\chapter8\webapp\

then issue this command:

C:\Python32\python.exe simple_httpd.py

Now when the web server runs, it'll find the data as well as the CGI script in the same folder as the simple_httpd.py program.

Try that and let's see what happens...

--Paul.

Phew.. That finally worked. I had actually forgot what the desired output was. Past few days were like shuttling between "404" and "json object not decoded".

Just one point that I observed. Using urllib or urllib2 doesn't make difference in this application. So why do two separate modules exist?

Thanks ,
Dharmit

[paulbarry]

To be honest, I don't know... I'm just glad it is working! :-)

[Dharmit]

Paul,

Starting a new topic for the same program didn't seem worth so I am continuing here.

After tapping on the user ans clicking Select button, I get No Json object decoded error once again. I think that it's not able to sort the list of times. But I don't understand why.

I am attaching screenshot of prompt, emulator and generate.py files with the post.

Dharmit

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[paulbarry]

The error message you are seeing refers to a problem with AtheleteList.py. Make sure you are following the instructions at the bottom of page 286. --Paul.

[chrisvetek]

can you help me with this issue? i am stuck on the lib2 vs lib issue, i can't figure it out. i have no problem staying up late to figure it out, so just tell me if you think there's already enough info here. i will keep re-reading it to figure it out.

[chrisvetek]

chrisvetek, on 31 January 2012 - 08:03 PM, said:

can you help me with this issue? i am stuck on the lib2 vs lib issue, i can't figure it out. i have no problem staying up late to figure it out, so just tell me if you think there's already enough info here. i will keep re-reading it to figure it out.

update, 1 am.
I GOT IT. Sorry to bother you, I feel like dancing now.