在python中发送/接收文件UDP [英] sending/receiving file UDP in python
问题描述
我已经制作了这个发送/接收脚本，但是我损坏了文件！ 我不知道为什么会遇到这个问题！
I've made this sending / receiving scripts but i corrupted file ! i have no idea why I'm getting this issue !
sender.py
sender.py
#!/usr/bin/env python
from socket import *
import sys
s = socket(AF_INET,SOCK_DGRAM)
host =sys.argv[1]
port = 9999
buf =1024
addr = (host,port)
file_name=sys.argv[2]
f=open(file_name,"rb")
data = f.read(buf)
s.sendto(file_name,addr)
s.sendto(data,addr)
while (data):
if(s.sendto(data,addr)):
print "sending ..."
data = f.read(buf)
s.close()
f.close()
receiver.py
receiver.py
#!/usr/bin/env python
from socket import *
import sys
import select
host="0.0.0.0"
port = 9999
s = socket(AF_INET,SOCK_DGRAM)
s.bind((host,port))
addr = (host,port)
buf=1024
data,addr = s.recvfrom(buf)
print "Received File:",data.strip()
f = open(data.strip(),'wb')
data,addr = s.recvfrom(buf)
try:
while(data):
f.write(data)
s.settimeout(2)
data,addr = s.recvfrom(buf)
except timeout:
f.close()
s.close()
print "File Downloaded"
这是我修改过的原始接收器(可以100％正常工作)
and this the original receiver that I've modify it (works fine 100%)
#!/usr/bin/env python
from socket import *
import sys
import select
host="0.0.0.0"
port = 9999
s = socket(AF_INET,SOCK_DGRAM)
s.bind((host,port))
addr = (host,port)
buf=1024
f = open("file.pdf",'wb')
data,addr = s.recvfrom(buf)
try:
while(data):
f.write(data)
s.settimeout(2)
data,addr = s.recvfrom(buf)
except timeout:
f.close()
s.close()
print "File Donwloaded"
正如您所注意到的，它在一开始就是文件.
as you notice it's making file at the beginning.
已实现: 客户端=>发送文件(name.ext)=>服务器:保存文件(name.ext)
exacted: client => send file (name.ext) => server:save it (name.ext)
我的输出: pdf损坏的文件，txt损坏的空文件
my output : corrupted file for pdf and empty for txt
推荐答案
这里有两个问题:
您正在使用from socket import *.它本身不是一个错误，但是当您执行except socket.timeout时它会变成一个错误.
You're using a from socket import *. It's not an error on its own, but it becomes one when you do except socket.timeout.
使用UDP，腐败不会令人惊讶.您可能不想在这里使用UDP，应该切换到TCP.
Using UDP, corruption shouldn't be a surprise. You probably don't want to be using UDP here, you should switch to TCP.
这就是为什么UDP在这里不合适的原因:
Here's why UDP is not appropriate here:
- 数据包可能会丢失，但其他数据包仍可以到达目的地.
- 数据包可能重复
- 数据包可能以错误的顺序到达
请注意，切换到TCP会涉及一些代码重构(将SOCK_DGRAM替换为SOCK_STREAM有点复杂)，但是对于您而言，您必须这样做
Note that switching to TCP will involve some refactoring of your code (it's a bit more complicated that just replacing SOCK_DGRAM with SOCK_STREAM), but in your case, you have to do it.
我并不是说UDP不好，但这不适用于您的情况.
I'm not saying UDP is bad, but it's not appropriate in your case.
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