HttpWebRequest POST和Cookie [英] HttpWebRequest POST and Cookies

问题描述

 
 
 code>函数GetPage（ByVal Url As String）As String 
 Dim CookieJar As New Net.CookieContainer 
 Dim enc As Encoding = Encoding.GetEncoding（1252）
 Dim Data As Byte ）= Nothing 
 
 Dim PostData As String =
如果InStr（Url，？）< 0 Then 
 PostData = Url.Substring（InStr（Url，？））
 Url = Replace（Url，PostData，）
 Url = Url.TrimEnd ）
 
 Data = enc.GetBytes（PostData）
结束如果
 
 Dim req As System.Net.HttpWebRequest = CType（Net.WebRequest.Create（Url） ，Net.HttpWebRequest）
 req.AllowAutoRedirect = False 
 req.ContentType =application / x-www-form-urlencoded
 req.Method =POST
如果不是数据没有然后
如果Data.Length> 0 then 
 req.ContentLength = Data.Length 
 Dim newStream As Stream = req.GetRequestStream（）
 newStream.Write（Data，0，Data.Length）
 newStream.Flush （）
 newStream.Close（）
如果
结束如果
 $ b结束如果
 
 req.CookieContainer = CookieJar 
 Dim Response As Net.HttpWebResponse = CType 。
 Dim Html As String = ResponseStream.ReadToEnd（）返回一个响应消息，返回一个响应消息，并返回一个响应消息。 ）
 
 Response.Close（）
 ResponseStream.Close（）
 
返回Html 
结束函数
  
 
 
 
我应该怎么办？
解决方案
在向 .GetRequestStream（） 
 $ c 
 $ b写入任何数据之前设置 .CookieContainer  
查看以下示例：
  CookieContainer cookies = new CookieContainer（）; 
 HttpWebRequest postRequest =（HttpWebRequest）WebRequest.Create（site）; 
 postRequest.CookieContainer = cookies; // note this 
 postRequest.Method =POST; 
 postRequest.ContentType =application / x-www-form-urlencoded; 
 using（Stream stream = postRequest.GetRequestStream（））
 {
 stream.Write（buffer，0，buffer.Length）; 
} 
  
 
Hi am trying to make an application that post data to a joomla login page but the only thing i get back is cookies is not enabled.
Function GetPage(ByVal Url As String) As String
    Dim CookieJar As New Net.CookieContainer
    Dim enc As Encoding = Encoding.GetEncoding(1252)
    Dim Data As Byte() = Nothing

    Dim PostData As String = ""
    If InStr(Url, "?") <> 0 Then
        PostData = Url.Substring(InStr(Url, "?"))
        Url = Replace(Url, PostData, "")
        Url = Url.TrimEnd("?"c)

        Data = enc.GetBytes(PostData)
    End If

    Dim req As System.Net.HttpWebRequest = CType(Net.WebRequest.Create(Url), Net.HttpWebRequest)
    req.AllowAutoRedirect = False
    req.ContentType = "application/x-www-form-urlencoded"
    req.Method = "POST"
    If Not Data Is Nothing Then
        If Data.Length > 0 Then
            req.ContentLength = Data.Length
            Dim newStream As Stream = req.GetRequestStream()
            newStream.Write(Data, 0, Data.Length)
            newStream.Flush()
            newStream.Close()
        End If
    End If

    req.CookieContainer = CookieJar
    Dim Response As Net.HttpWebResponse = CType(req.GetResponse(), Net.HttpWebResponse)

    Dim ResponseStream As IO.StreamReader = New IO.StreamReader(Response.GetResponseStream(), enc)
    Dim Html As String = ResponseStream.ReadToEnd()

    Response.Close()
    ResponseStream.Close()

    Return Html
End Function
How should i do?
解决方案
Try to set .CookieContainer before writing any data to .GetRequestStream()

Look this sample:
CookieContainer cookies = new CookieContainer();
HttpWebRequest postRequest = (HttpWebRequest)WebRequest.Create(site);
postRequest.CookieContainer = cookies; // note this
postRequest.Method = "POST";
postRequest.ContentType = "application/x-www-form-urlencoded";
using (Stream stream = postRequest.GetRequestStream())
{
    stream.Write(buffer, 0, buffer.Length);
}


                        
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