Python Using Socket File Transfer

Question

i have a small program for receiving a txt file from an arduino. the problem is sometimes it prints an empty file. i assume because the receiving part of the code is empty at the time. can someone help me make this code not write to the file when "t" is empty so i can prevent it from writing a blank txt file? thanks

with open('sensData.txt','wb') as f:
while True:
 t = conn.recv(20)
 print t
 if not t:
    s.close()
    break
 f.write(t) #Write To File UNLESS BLANK

How would you distinguish between end-of-file and simply a transfer “hiccup” then? You’d probably have to introduce a simple timeout to do that. — ForceBru
– ForceBru, Commented Mar 28, 2018 at 9:28
thats a good point. i dont know what to do at this point. ive only been learing python for 4 days now. what could i do to prevent a write on a corrupted transfer or a blank txt file, which is probably what is happening in the first place — notsolowki
– notsolowki, Commented Mar 28, 2018 at 9:33

toheedNiaz · Accepted Answer · 2018-03-28 09:34:16Z

1

you need to try this :

  with open('sensData.txt','wb') as f:
    while True:
     t = conn.recv(1)
     print t
     if t =='':
        s.close()
        break
     f.write(t)

or you can populate a string and write it at once at the end of the loop

  with open('sensData.txt','wb') as f:
   receivedData = ""
    while True:
     t = conn.recv(1)
     print t
     if t =='':
        s.close()
        break
     receivedData+=t

   f.write(receivedData)

answered Mar 28, 2018 at 9:34

toheedNiaz

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6 Comments

notsolowki Over a year ago

thankyou soo much, this answer my first question. another big problem i have is, i run this program in a batch script loop on windows for the time being which works except sometimes it freezes at calling the script. which probably is a messed up connection/transfer. what can i implement to prevent the scipt freezing at a corrupted connection?

toheedNiaz Over a year ago

I think with these changes you will not face this issue can you please try and share your experience?

notsolowki Over a year ago

yes thankyou im using it now. sometimes i wont have a problem for hours. now time will tell

toheedNiaz Over a year ago

accept the answer if you think the problem is solved

notsolowki Over a year ago

its still writing a blank file, altho t does = the received data? the problem is i cant let it print anything to the file if its blank ever

|

score 0 · Accepted Answer · 2018-05-10 12:16:55Z

0

if t != "":
    f.write(t)

if t is empty, this should work

edited May 10, 2018 at 12:16

answered Mar 28, 2018 at 9:33

user5308730

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