如何处理ASP.net的隐式隐藏值?(VIEWSTATE) [英] HowTo deal with cryptic hidden values for ASP.net? (VIEWSTATE)

查看：54 发布时间：2021/4/10 19:44:07 asp.net python parsing viewstate

本文介绍了如何处理ASP.net的隐式隐藏值?(__VIEWSTATE)的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我试图弄清楚如何处理神秘的"__VIEWSTATE"消息.&当您尝试使用Python请求(发布)页面时，请选择Cie.这是我脚本中很多问题的主要根源……当我寻找答案/解决方案时，我意识到您没有那么多解决方案(几乎为0！).

I was trying to figure out how to deal with the cryptic "__VIEWSTATE" & Cie when you are trying to request (POST) a page with Python. It is the main source of a lot of problems in my scripts ... and I realize, when I was looking for answers / solutions, that you don't have that much of solutions (almost 0 !).

在本主题中:无法使用Python urllib2加载ASP.NET页面您可以看到，每次加载页面时，我都在通过对大陆字段的值进行解析来为我提供解决方案……这是可行的，但实际上这很愚蠢:-)

In this topic: Unable to load ASP.NET page using Python urllib2 You can see that I am giving my solution with consist in parsing the value of the cryptic fields every time you load the page ... That works, but that's quite stupid actually :-)

    for result in the_page.findAll('input', attrs={'name' : '__VIEWSTATE'}):
        view_state =  result['value']

    for result_1 in the_page.findAll('input', attrs={'name' : '__EVENTVALIDATION'}):
        event_validation =  result_1['value']

    for result_2 in the_page.findAll('input', attrs={'name' : '__PREVIOUSPAGE'}):
        previous_page =  result_2['value']

    for result in the_page.findAll('input', attrs={'name' : '__EVENTTARGET'}):
        event_target =  result['value']

之后:

    url = 'http://bandscore.ielts.org/search.aspx'
    values = {
                            '__EVENTTARGET' : 'gdvSearchResults',
                            '__EVENTARGUMENT' : page,
                        '__VIEWSTATE' : view_state,
                        '__PREVIOUSPAGE' : previous_page,
                        '__EVENTVALIDATION' : event_validation,
                        'DropDownList1'  : Country,
                        #'txtSearchInstitution'  : '',
                        #'hdnSearchText'  : '',
                        #'rdoFilter': '%25',
    }
    user_agent = 'Mozilla/5 (Solaris 10) Gecko'
    headers = { 'User-Agent' : user_agent }
    data = urllib.urlencode(values)
    req = urllib2.Request(url, data, headers)
    response = urllib2.urlopen(req)
    thePage = response.read()
    the_page = soup(thePage)

因此，这里还有一些链接有很好的解释/一些正在提出解决方案:

So here few more links with good explanations / some are proposing solutions:

__VIEWSTATE拥有什么?

> http://aspalliance.com/articleViewer.aspx?aId=135&pId =

http://msdn.microsoft.com/en-us/library/system.web.ui.losformatter.aspx

http://weblogs.asp.net/infinitiesloop/archive/2006/08/03/Truly-Understanding-Viewstate.aspx

http://msdn.microsoft.com/en-us/library/ms972976.aspx

机械化没有看到一些隐藏的表单输入吗?

无法使用Python urllib2加载ASP.NET页面

我意识到很多人都在试图找到一种解决此问题的好方法，所以让我们一起努力寻找一个好的解决方案；-)

I realize that a lot of people are trying to find a good way to deal with that, so let's try to find a good solution, all together ;-)

EDIT1 :发现也很有趣， http://code.google.com/p/peekviewstate/source/browse/trunk/src/peekviewstate_example.py