使用web浏览器URL没有自动filedownload [英] Automated filedownload using WebBrowser without url

问题描述

我一直使用System.Windows.Forms.WebBrowser写在C＃中的WebCrawler的。我试图下载文件时关闭一个网站，将其保存到本地计算机上。更重要的是，我想这是完全自动化。文件下载可以通过点击一个按钮，调用火花显示你想打开或保存此文件？对话框中选择下载JavaScript函数来启动。我绝对不希望手动点击另存为，并在文件名输入。

I've been working on a WebCrawler written in C# using System.Windows.Forms.WebBrowser. I am trying to download a file off a website and save it on a local machine. More importantly, I would like this to be fully automated. The file download can be started by clicking a button that calls a javascript function that sparks the download displaying a "Do you want to open or save this file?" dialog. I definitely do not want to be manually clicking "Save as", and typing in the file name.

我知道HttpWebRequest和WebClient的的下载功能，但由于在下载开始一个JavaScript，我不知道现在该文件的URL。据透露，javascript的是改变一些值，并提交形式doPostBack功能。

I am aware of HttpWebRequest and WebClient’s download functions, but since the download is started with a javascript, I do now know the URL of the file. Fyi, the javascript is a doPostBack function that changes some values and submits a form.

我试着在另存为对话框，web浏览器，而无需太多的成功它在那里获得自动对焦。我知道有一种方法强制下载保存，而不是要求增加一个头就可以了http请求保存或打开，但我不知道如何指定文件路径下载到。

I’ve tried getting focus on the save as dialog from WebBrowser to automate it from in there without much success. I know there’s a way to force the download to save instead of asking to save or open by adding a header to the http request, but I don’t know how to specify the filepath to download to.

推荐答案

我觉得你应该prevent甚至从显示下载对话框。这里可能是一个办法做到这一点：

I think you should prevent the download dialog from even showing. Here might be a way to do that:

• JavaScript的code使您的WebBrowser控件导航到一个特定的URL（什么会导致出现下载对话框）

• The Javascript code causes your WebBrowser control to navigate to a specific Url (what would cause the download dialog to appear)

要prevent从实际导航到以下链接WebBrowser控件，附加一个事件处理程序的导航事件。

To prevent the WebBrowser control from actually Navigating to this Url, attach a event handler to the Navigating event.

在您的导航事件你要分析，如果这是你想要停止（实际导航行动这一个下载网址，或许检查文件扩展名，必须有一个可识别的格式）。使用WebBrowserNavigatingEventArgs.Url这样做。

In your Navigating event you'd have to analyze if this is the actual Navigation action you'd want to stop (is this one the download url, perhaps check for a file extension, there must be a recognizable format). Use the WebBrowserNavigatingEventArgs.Url to do so.

如果这是正确的网址，通过设置WebBrowserNavigatingEventArgs.Cancel物业停止导航。

If this is the right Url, stop the Navigation by setting the WebBrowserNavigatingEventArgs.Cancel property.

继续下载自己用的HttpWebRequest或WebClient的类

Continue the download yourself with the HttpWebRequest or WebClient classes

看一看这个网页上的事件的详细信息：

<一href=\"http://msdn.microsoft.com/en-us/library/system.windows.forms.webbrowser.navigating.aspx\">http://msdn.microsoft.com/en-us/library/system.windows.forms.webbrowser.navigating.aspx

Have a look at this page for more info on the event:
http://msdn.microsoft.com/en-us/library/system.windows.forms.webbrowser.navigating.aspx

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