Python ftplib损坏文件? [英] Python ftplib Corrupting Files?

问题描述

我正在使用ftplib在Python中下载文件，直到最近一切似乎都工作正常.我正在这样下载文件:

I'm downloading files in Python using ftplib and up until recently everything seemed to be working fine. I am downloading files as such:

ftpSession = ftplib.FTP(host,username,password)
ftpSession.cwd('rlmfiles')
ftpFileList = filter(lambda x: 'PEDI' in x, ftpSession.nlst())
ftpFileList.sort() 
for f in ftpFileList:
    tempFile = open(os.path.join(localDirectory,f),'wb')
    ftpSession.retrbinary('RETR '+f,tempFile.write)
    tempFile.close()
ftpSession.quit()
sys.exit(0)

直到最近，它仍可以按预期下载我需要的文件.但是，现在，我正在下载的我的文件"已损坏，仅包含一长串垃圾ASCII.我知道不是将文件发布到FTP上，因为我也有一个Perl脚本可以从同一FTP成功完成此操作.

Up until recently it was downloading the files I needed just fine, as expected. Now, however, My files I'm downloading are corrupted and just contain long strings of garbage ASCII. I know that it is not the files posted onto the FTP I'm pulling them from because I also have a Perl script that does this successfully from the same FTP.

如果有任何其他信息，这是调试器在下载文件时在命令提示符中显示的内容:

If it is any additional info, here's what the debugger puts out in the command prompt when downloading a file:

有人使用Python的ftplib中的 retrbinary()遇到文件损坏的问题吗?

Has anyone encountered any issues with corrupted file contents using retrbinary() in Python's ftplib?

我真的很困/沮丧，并且在这里没有遇到任何与可能的腐败有关的事情.任何帮助表示赞赏.

I'm really stuck/frustrated and haven't come across anything related to possible corruption here. Any help is appreciated.

推荐答案

昨天我在尝试下载文本文件时遇到了这个问题.不知道那是不是在做什么，但是由于您说它里面有ASCII垃圾，我假设您在文本编辑器中打开了它，因为它应该是文本.

I just ran into this issue yesterday when I was attempting to download text files. Not sure if that is what you were doing, but since you say it has ASCII garbage in it, I assume you opened it in a text editor because it was supposed to be text.

在这种情况下，问题在于该文件是文本文件，您正尝试以二进制模式下载它.

If this is the case, the problem is that the file is a text file and you are trying to download it in binary mode.

您要做的是以ASCII传输模式检索文件.

What you want to do instead is retrieve the file in ASCII transfer mode.

tempFile = open(os.path.join(localDirectory,f),'w')  # Changed 'wb' to 'w'
ftpSession.retrlines('RETR '+f,tempFile.write)       # Changed retrbinary to retrlines

不幸的是，这会将所有换行符从文件中删除.uck！

Unfortunately, this strips all the new-line characters out of the file. Yuck!

因此，您需要再次添加删除的换行符:

So then you need to add the stripped out new-line characters again:

tempFile = open(os.path.join(localDirectory,f),'w')
textLines = []
ftpSession.retrlines('RETR '+f,textLines.append)
tempFile.write('\n'.join(textLines))

这应该可以，但是看起来不尽如人意.因此，只需进行一些清理工作即可:

This should work, but it doesn't look as nice as it could. So a little cleanup effort would get us:

temporaryFile   = open(os.path.join(localDirectory, currentFile), 'w')
textLines       = []
retrieveCommand = 'RETR '

ftpSession.retrlines(retrieveCommand + currentFile, textLines.append)
temporaryFile.write('\n'.join(textLines))

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