Python 邮件：编码附件被截断
我正在使用以下函数在 python 脚本中发送带有两个附件的电子邮件：
import smtplib
from email.MIMEMultipart import MIMEMultipart
from email.MIMEBase import MIMEBase
from email.MIMEText import MIMEText
from email.Utils import COMMASPACE, formatdate
from email import Encoders
...
def sendMail(sender_name, to, subject, text, files=None,server="localhost"):
assert type(to)==list
if files:
assert type(files)==list
print "Files: ",files
fro = sender_name
msg = MIMEMultipart()
msg['From'] = fro
msg['To'] = COMMASPACE.join(to)
msg['Date'] = formatdate(localtime=True)
msg['Subject'] = subject
msg.attach( MIMEText(text) )
if files:
for file in files:
# ************** File attaching - Start **************
part = MIMEBase('application', "octet-stream")
part.set_payload( open(file,"rb").read() )
Encoders.encode_base64(part)
part.add_header('Content-Disposition', 'attachment; filename="%s"' % os.path.basename(file))
msg.attach(part)
# ************** File attaching - End **************
server.set_debuglevel(1)
server.ehlo()
server.starttls()
server.ehlo()
server.sendmail(fro, to, msg.as_string())
server.quit()
我收到邮件，附件在那里，但由于某种原因，它们被截断了一点。我的猜测是我在编码过程中遗漏了一些东西。
例如：
附件 1：原始文件字节数为 1433902，而新字节数为 1433600
附件 2：原始文件字节数为 2384703，而新字节数为 2383872
有什么想法吗？
I'm using the following function to send an email message with two attachments in my python script:
import smtplib
from email.MIMEMultipart import MIMEMultipart
from email.MIMEBase import MIMEBase
from email.MIMEText import MIMEText
from email.Utils import COMMASPACE, formatdate
from email import Encoders
...
def sendMail(sender_name, to, subject, text, files=None,server="localhost"):
assert type(to)==list
if files:
assert type(files)==list
print "Files: ",files
fro = sender_name
msg = MIMEMultipart()
msg['From'] = fro
msg['To'] = COMMASPACE.join(to)
msg['Date'] = formatdate(localtime=True)
msg['Subject'] = subject
msg.attach( MIMEText(text) )
if files:
for file in files:
# ************** File attaching - Start **************
part = MIMEBase('application', "octet-stream")
part.set_payload( open(file,"rb").read() )
Encoders.encode_base64(part)
part.add_header('Content-Disposition', 'attachment; filename="%s"' % os.path.basename(file))
msg.attach(part)
# ************** File attaching - End **************
server.set_debuglevel(1)
server.ehlo()
server.starttls()
server.ehlo()
server.sendmail(fro, to, msg.as_string())
server.quit()
I get the mail, and the attachments are there, but for some reason, they are truncated a bit. My guess is I'm missing something in the encoding process.
For example:
Attachment 1: Original file byte count is 1433902, while the new byte count is 1433600
Attachment 2: Original file byte count is 2384703, while the new byte count is 2383872
Any ideas?
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发现问题了。结果我尝试在写入过程的缓冲区完全刷新之前发送文件。
因此，这是一个同步问题，而不是编码问题。
对此深表歉意，并感谢各位的帮助！
Found the problem. Turns out I tried sending the files before the buffer of the writing process was fully flushed.
So, it was a synchronization issue and not an encoding issue.
Sorry about that, and thanks for the help guys!
它可能与您当前的
base64.MAXBINSIZE有关吗？Encoders.encode_base64在内部使用base64.encodestring。base64.MAXBINSIZE的默认值为 57，可以随时尝试将其设置得更大：base64.MAXBINSIZE = 65536Could it be related to your current
base64.MAXBINSIZE?Encoders.encode_base64usesbase64.encodestringinternally. The default value forbase64.MAXBINSIZEis 57, can always try setting it larger:base64.MAXBINSIZE = 65536如果文件已写入，请务必 .close() 文件并为有效负载重新 open()/.read() 文件。
我的问题源于时间安排，这为我解决了问题。
If the file is already written--be sure to .close() the file and re-open()/.read() it for the payload.
My issues stemmed from timing and this solved the issue for me.