如何使用HttpWebRequest的下载文件 [英] How to use HttpWebRequest to download file

问题描述

试图下载在code文件。

Trying to download file in code.

当前code：

  Dim uri As New UriBuilder
    uri.UserName = "xxx"
    uri.Password = "xxx"
    uri.Host = "xxx"
    uri.Path = "xxx.aspx?q=65"

   Dim request As HttpWebRequest = DirectCast(WebRequest.Create(uri.Uri), HttpWebRequest)

    request.AllowAutoRedirect = True

    request = DirectCast(WebRequest.Create(DownloadUrlIn), HttpWebRequest)
    request.Timeout = 10000
    'request.AllowWriteStreamBuffering = True

    Dim response As HttpWebResponse = Nothing
    response = DirectCast(request.GetResponse(), HttpWebResponse)
    Dim s As Stream = response.GetResponseStream()

    'Write to disk
    Dim fs As New FileStream("c:\xxx.pdf", FileMode.Create)

    Dim read As Byte() = New Byte(255) {}
    Dim count As Integer = s.Read(read, 0, read.Length)
    While count > 0
        fs.Write(read, 0, count)
        count = s.Read(read, 0, read.Length)
    End While

    'Close everything
    fs.Close()
    s.Close()
    response.Close()

运行此code和检查response.ResponseUri表明IM被重定向到登录页面，而不是PDF文件。

Running this code and checking the response.ResponseUri indicates im being redirected back to the login page and not to the pdf file.

出于某种原因，它不是授权访问什么可能我会丢失作为即时通讯发送URI中的用户名和密码？感谢您的帮助。

For some reason its not authorising access what could I be missing as Im sending the user name and password in the uri? Thanks for your help

推荐答案

您并不需要所有的code的从网上下载文件
只需使用 Web客户端类及其 DownloadFile 方法

You don't need all of that code to download a file from the net just use the WebClient class and its DownloadFile method

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