Need Help on Pack n Unpack

[tulipneo]

Hi List,
Can some one help me with pack and unpack of structs.I get some problem at runtime.

(a, b,errorCode, latitude, longitude, c, d, e) = unpack(">hBiiiiih",result)
The bove statement in the code gives bellow error
"unpack Requires a string argument of length 25"




from httplib import HTTP
from struct import *
import location
import urllib2
import sysinfo


latitude = 0
longitude = 0

def doLookup(cellId, lac, host = "www.google.com", port = 80):

from string import replace
#from struct import unpack
page = "/glm/mmap"
http = HTTP(host, port)
result = None
errorCode = 0
content_type, body = encode_request(cellId, lac)
http.putrequest('POST', page)
http.putheader('Content-Type', content_type)
http.putheader('Content-Length', str(len(body)))
http.endheaders()
http.send(body)
errcode, errmsg, headers = http.getreply()
result = http.file.read()


# could need some modification to get the answer: here I just need
# to get the 5 first characters
if (errcode == 200):
(a, b,errorCode, latitude, longitude, c, d, e) = unpack(">hBiiiiih",result)
latitude = latitude / 1000000.0
longitude = longitude / 1000000.0
return latitude, longitude

def encode_request(cellId, lac):
#from struct import pack
content_type = 'application/binary'
body = pack('>hqh2sh13sh5sh3sBiiihiiiiii', 21, 0, 2, 'in', 13, "Nokia N95 8Gb", 5,"1.3.1", 3, "Web", 27, 0, 0, 3, 0, cellId, lac, 0, 0, 0, 0)
return content_type, body

(mcc, mnc, lac, cellId) = location.gsm_location()
print'IMEI :',sysinfo.imei()
print "MCC :" + str(mcc)
print "MNC :" + str(mnc)
print "LAC :" + str(lac)
print "CID :" + str(cellId)
print 'Battery Level : ',sysinfo.battery()
print 'Signal Strength :',sysinfo.signal_bars()
(latitude, longitude) = doLookup(cellId, lac, "www.google.com", 80)
print latitude
print longitude

[marcelobarrosalmeida]

Tulipneo

Can some one help me with pack and unpack of structs.I get some problem at runtime.

(a, b,errorCode, latitude, longitude, c, d, e) = unpack(">hBiiiiih",result)
The bove statement in the code gives bellow error
"unpack Requires a string argument of length 25"

You need to check your result:

result = http.file.read()
print len(result)

Your specification is waiting for 25 bytes (hBiiiiih = short(2)+char(1)+int(4)*5+short(2) = 25)
but result seems to be smaller.

[tulipneo]

Hi
I did try to debug the app and found that i dont get correct result from google.
When i again started to debug i found that (mcc, mnc, lac, cellId) = location.gsm_location() does not work properly.
I get
cellId = 118041508 lac = 18007 mnc = 76 mcc = 404
I should get a 5 didgit cellid but unfortunately i get 9 digit number.
so when i try to unpack soem thing that google does not return i get error.
I tried the same with my friend it worked fine.
I just can not figure out where i m wrong.
Can any oen suggest where i m wrong.

Br
Tulip

[marcelobarrosalmeida]

cellId = 118041508 lac = 18007 mnc = 76 mcc = 404

Is that the value for result variable ? I don't think so, right ? Could you put the exact answer here ? It will be easier to help you to decode it.