Downloading file using IE from python

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无人及你
无人及你 2021-02-04 15:38

I\'m trying to download file with Python using IE:

from win32com.client import DispatchWithEvents

class EventHandler(object):
    def OnDownloadBegin(self):
            


        
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8条回答
  • 2021-02-04 16:04

    I don't know how to say this nicely, but this sounds like about the most foolhardy software idea in recent memory. Python is much more capable of performing AJAX calls than IE is.

    To access the data, yes, you can use urllib and urllib2 . If there is JSON data in the response, there's the json library; likewise for XML and HTML, there's BeautifulSoup.

    For one project, I had to write a Python program that would simulate a browser and sign into any of 20 different social networks (remember Friendster? Orkut? CyberWorld? I do), and upload images and text into the user's account, even grasping CAPTCHAs and complex JavaScript interactions. Pure Python makes it (comparatively) easy; as you've already seen, trying to use IE makes it impossible.

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  • 2021-02-04 16:05

    This is definitely absolutely the last way I would normally do this but today I did have to resort to banging away to get something working. I have IE 10 so @cgohlke's answer won't work (no window text). All attempts to get a proper version of Client Authentication working were failing so had to fall back on this. Maybe it'll help someone else who's equally at the end of their tether.

    import IEC
    import pywinauto
    import win32.com
    
    # Creates a new IE Window
    ie = IEC.IEController(window_num=0)
    
    # Register application as an app for pywinauto
    shell = win32com.client.Dispatch("WScript.Shell")
    pwa_app = pywinauto.application.Application()
    w_handle = pywinauto.findwindows.find_windows(title=u'<Title of the site - find it using SWAPY>', class_name='IEFrame')[0]
    window = pwa_app.window_(handle=w_handle)
    window.SetFocus()
    
    # Click on the download link
    ie.ClickLink(<download link>)
    
    # Get the handle of the Open Save Cancel dialog
    ctrl = window['2']
    
    # You may need to adjust the coords here to make sure you hit the button you want
    ctrl.ClickInput(button='left', coords=(495, 55), double=False, wheel_dist=0)
    

    But man, is it horrible!

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  • 2021-02-04 16:09

    One option could also be to embed your own browser.

    Thats e.g. possible with Qt via PyQt (GPL) or PySide (LGPL). There you could embed the WebKit engine. You could then either display the page in a QWebView and let the user navigate to your download and filter that event or use a simple QWebPage where everything could be automated and nothing has to be shown at all.

    And WebKit should be mighty enough to do anything you want.

    Very basic example:

    import sys
    
    from PySide import QtCore, QtGui, QtWebKit
    
    url = 'http://developer.qt.nokia.com/wiki/PySideDownloads/'
    
    class TestKit(QtCore.QObject):
        def __init__(self, app):
            self.page = QtWebKit.QWebPage()
            self.page.loadFinished.connect(self.finished)
            self.page.mainFrame().load(QtCore.QUrl(url))
            self.app = app
    
        def finished(self, evt):
            # inspect DOM -> navigate to next page or download
            print self.page.currentFrame().documentElement().toInnerXml().encode(
                    'utf-8')
            # when everything is done
            self.app.quit()
    
    
    if __name__ == '__main__':
        app = QtGui.QApplication(sys.argv)
        t = TestKit(app)
        sys.exit(app.exec_())
    
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  • 2021-02-04 16:16

    This works for me as long as the IE dialogs are in the foreground and the downloaded file does not already exist in the "Save As" directory:

    import time
    import threading
    import win32ui, win32gui, win32com, pythoncom, win32con
    from win32com.client import Dispatch
    
    class IeThread(threading.Thread):
        def run(self):
            pythoncom.CoInitialize()
            ie = Dispatch("InternetExplorer.Application")
            ie.Visible = 0
            ie.Navigate('http://website/file.xml')
    
    def PushButton(handle, label):
        if win32gui.GetWindowText(handle) == label:
            win32gui.SendMessage(handle, win32con.BM_CLICK, None, None)
            return True
    
    IeThread().start()
    time.sleep(3)  # wait until IE is started
    wnd = win32ui.GetForegroundWindow()
    if wnd.GetWindowText() == "File Download - Security Warning":
        win32gui.EnumChildWindows(wnd.GetSafeHwnd(), PushButton, "&Save");
        time.sleep(1)
        wnd = win32ui.GetForegroundWindow()
    if wnd.GetWindowText() == "Save As":
        win32gui.EnumChildWindows(wnd.GetSafeHwnd(), PushButton, "&Save");
    
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  • 2021-02-04 16:17

    You don't need to use IE. You could use something like

    import urllib2
    data = urllib2.urlopen("http://website/file.xml").read()
    

    Update: I see you've updated your question. If you need to use a browser, then clearly this answer isn't appropriate for you.

    Further update: When you click the button which is generated by JavaScript, if the URL retrieved is not computed by the JavaScript, and only the button is, then you can perhaps retrieve that URL via urllib2. On the other hand, you might also need to pass a session cookie from your authenticated session.

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  • 2021-02-04 16:21

    If you can't control Internet Explorer using its COM interface, I suggest using the AutoIt COM to control its GUI from Python.

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