Hi,

I have a small python program with e-mail capabilities that I have pieced together from code snippets found on the internet.

The program uses the smtplib module to successfully send an e-mail with an attachment.

I want to give users an indication of the percentage of the e-mail that has already been sent so as to avoid frustration when dealing with large attachments or a slow smtp server. But the smtplib module doesn't seem to provide access to the number of bytes that have already been sent.

Can anyone help, or provide a working example of sending an e-mail attachment using basic python sockets whilst having access to the number of bytes that have already been sent through the socket?

Many thanks.

William Connery


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#!/usr/bin/python

import wx
import smtplib
from email import Encoders
from email.MIMEMultipart import MIMEMultipart
from email.Utils import COMMASPACE, formatdate
from email.MIMEBase import MIMEBase
from email.MIMEText import MIMEText
import os

# set a few variables to make testing less tedious

# you need to set your smtp server domain name
smtp_server = 'smtp.your_isp_domain.com'

toemail = 'toemail@somedomain.org'
fromemail = 'fromemail@anotherdomain.org'
subject = 'Testing python smtplib module'
emailmsg = 'How do I determine the number of bytes that have been ' +\
'forwarded whilst the e-mail is being sent?\n\nSending large (or many) ' +\
'attachments may take some time, and I\'d like to use a gauge ' +\
'control to give users an indication of the percentage of ' +\
'the e-mail that has already been sent.\n\nThe smtplib module relies ' +\
'on sockets, but I don\'t know how to use python sockets to ' +\
'send an e-mail with attachments and concurrently monitor the ' +\
'number of bytes that have already been sent.\n\nHelp !'

# attachment file
attachment = 'C:\\Documents and Settings\\-\\Desktop\\test.zip'
#attachment = '/home/user1/Desktop/test.zip'


# variable to hold bytes that have been sent
bytes_sent = 0




class MainFrame(wx.Frame):
def __init__(self, *args, **kwargs):
wx.Frame.__init__(self, *args, **kwargs)
self.SetSize(wx.Size(750,550))
self.SetTitle('Monitoring the number of bytes sent during ' +\
'a python e-mail send - How ?')

panel = wx.Panel(self)

vertsizer = wx.BoxSizer(wx.VERTICAL)

flexsizer = wx.FlexGridSizer(rows=8, cols=2, hgap=10, vgap=10)
flexsizer.AddGrowableCol(1)
flexsizer.AddGrowableRow(4)

tolabel = wx.StaticText(panel, -1, "To E-mail Address:")
flexsizer.Add(tolabel,0,wx.ALIGN_RIGHT|wx.ALIGN_CENTER_VERTICAL)
self.toemailaddress = wx.TextCtrl(panel)
flexsizer.Add(self.toemailaddress,0,wx.EXPAND)

fromlabel = wx.StaticText(panel, -1, "From E-mail Address:")
flexsizer.Add(fromlabel,0,wx.ALIGN_RIGHT|wx.ALIGN_CENTER_VERTICAL)
self.fromemailaddress = wx.TextCtrl(panel)
flexsizer.Add(self.fromemailaddress,0,wx.EXPAND)

attachmentbutton = wx.Button(panel, 1001, "File Attachment")
attachmentbutton.Bind(wx.EVT_BUTTON, self.SelectAttachmentFile)
flexsizer.Add(attachmentbutton,0,wx.ALIGN_RIGHT|wx.ALIGN_CENTER_VERTICAL)
self.attachmenteditbox = wx.TextCtrl(panel, style = wx.TE_CENTRE)
self.attachmenteditbox.Disable()
flexsizer.Add(self.attachmenteditbox,0,wx.EXPAND)

subjectlabel = wx.StaticText(panel, -1, "Subject:")
flexsizer.Add(subjectlabel,0,wx.ALIGN_RIGHT|wx.ALIGN_CENTER_VERTICAL)
self.subject = wx.TextCtrl(panel)
flexsizer.Add(self.subject,0,wx.EXPAND)

messagelabel = wx.StaticText(panel, -1, "E-mail Message:")
flexsizer.Add(messagelabel,0,wx.ALIGN_RIGHT)
self.emailmessage = wx.TextCtrl(panel, style = wx.TE_MULTILINE)
flexsizer.Add(self.emailmessage,1,wx.EXPAND)

flexsizer.AddSpacer(wx.Size(1,1))

self.gauge = wx.Gauge(panel)
self.gauge.SetRange(100)
self.gauge.SetValue(30)
sendbutton = wx.Button(panel, 1001, "Send E-mail")
sendbutton.Bind(wx.EVT_BUTTON, self.SendTheEmail)
hsizer = wx.BoxSizer(wx.HORIZONTAL)
hsizer.Add(self.gauge,1,wx.RIGHT,15)
hsizer.Add(sendbutton,0,wx.ALIGN_CENTER_VERTICAL)
flexsizer.Add(hsizer,0,wx.EXPAND)

byteslabel1 = wx.StaticText(panel, -1, "Bytes to Send:")
self.bytestosend = wx.StaticText(panel, -1, "0")
flexsizer.Add(byteslabel1,0,wx.ALIGN_RIGHT)
flexsizer.Add(self.bytestosend,0,wx.EXPAND)

byteslabel2 = wx.StaticText(panel, -1, "Bytes Sent:")
self.bytessent = wx.StaticText(panel, -1, "0")
flexsizer.Add(byteslabel2,0,wx.ALIGN_RIGHT)
flexsizer.Add(self.bytessent,0,wx.EXPAND)


vertsizer.Add(flexsizer,1, wx.EXPAND|wx.ALL,30)

# place values into appropriate text fields
# (these values can be initialized at the top of this script)

self.toemailaddress.SetValue(toemail)
self.fromemailaddress.SetValue(fromemail)
self.subject.SetValue(subject)
self.emailmessage.SetValue(emailmsg)

if os.path.exists(os.path.abspath(attachment)):
self.attachmenteditbox.SetValue(\
os.path.split(os.path.abspath(attachment))[1])

panel.SetSizer(vertsizer)

self.bytestosend.SetLabel(str(self.GetMimeSize()))



# select an attachment file for the e-mail
def SelectAttachmentFile(self, event):

filedlgbox = wx.FileDialog(self,\
message="Select an Attachment File", \
defaultDir=os.getcwd(), \
defaultFile='', \
wildcard="Any File (*.*)|*.*", \
style=wx.OPEN | wx.CHANGE_DIR | wx.HIDE_READONLY)

if filedlgbox.ShowModal() == wx.ID_OK:
global attachment
attachment = filedlgbox.GetFilenames()[0].strip()
self.attachmenteditbox.SetValue(os.path.split(attachment)[1])

filedlgbox.Destroy()

self.bytestosend.SetLabel(str(self.GetMimeSize()))

event.Skip()



def GetMimeSize(self):

# get size of current e-mail mime object

tempmime = MIMEMultipart()
tempmime['To'] = self.toemailaddress.GetValue().strip()
tempmime['From'] = self.fromemailaddress.GetValue().strip()
tempmime['Subject'] = self.subject.GetValue().strip()

# add the e-mail message to the mime object
tempmime.attach(MIMEText(self.emailmessage.GetValue()))

# add an attachment file to the mime object if selected
if attachment.strip() != '':
thisfile = os.path.abspath(attachment)
if os.path.exists(thisfile):
attachmentmime = MIMEBase('application', "octet-stream")
attachmentmime.set_payload( open(thisfile,"rb").read())
Encoders.encode_base64(attachmentmime)
attachmentmime.add_header('Content-Disposition',\
'attachment; filename="%s"' % os.path.basename(thisfile))
tempmime.attach(attachmentmime)

mimesize = len(tempmime.as_string())

tempmime = None

return mimesize


# send the e-mail using python's smtplib module
def SendTheEmail(self, event):

# how can I determine the number of bytes that have
# been forwarded whilst the e-mail is being sent ?
global bytes_sent
bytes_sent = 0

# set gauge value to zero - max value = 100 (%)
self.gauge.SetValue(0)

self.bytestosend.SetLabel(str(self.GetMimeSize()))
self.bytessent.SetLabel('0')

# create a multi-part mime object for the
# e-mail message and file attachment

thismime = MIMEMultipart()
thismime['To'] = self.toemailaddress.GetValue().strip()
thismime['From'] = self.fromemailaddress.GetValue().strip()
thismime['Subject'] = self.subject.GetValue().strip()

# add the e-mail message to the mime object
thismime.attach(MIMEText(self.emailmessage.GetValue()))

# add an attachment file to the mime object if selected
if attachment.strip() != '':
thisfile = os.path.abspath(attachment)
if os.path.exists(thisfile):
attachmentmime = MIMEBase('application', "octet-stream")
attachmentmime.set_payload( open(thisfile,"rb").read())
Encoders.encode_base64(attachmentmime)
attachmentmime.add_header('Content-Disposition',\
'attachment; filename="%s"' % os.path.basename(thisfile))
thismime.attach(attachmentmime)
else:
dlg = wx.MessageDialog(self,\
message='Attachment file ' + thisfile + ' is missing.',\
caption='Attachment Missing',style=wx.OK|\
wx.ICON_INFORMATION)
dlg.ShowModal()
dlg.Destroy()

# send the e-mail
smtpobj = smtplib.SMTP(smtp_server)
smtpobj.sendmail(self.fromemailaddress.GetValue().strip(), \
self.toemailaddress.GetValue().strip(), \
thismime.as_string())

smtpobj.close()


event.Skip()



if __name__ == '__main__':
app = wx.App()
theframe = MainFrame(None)
theframe.Show()
app.MainLoop()



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