How do I use windows application to read a cookie entry created by a specific web application

Posted on 2009-04-22
Medium Priority
Last Modified: 2013-12-08
I want to know how to use windows application to read a cookie entry created by a specific web application

The code below is from a web application. It creates the cookie entry if it does not already exist.

        If Not Page.IsPostBack Then

            Dim myCookie As HttpCookie = New HttpCookie("MyCode")
            If (Request.Cookies("MyCode") IsNot Nothing AndAlso Request.Cookies("MyCode").Value > 0) Then
                Dim mCode As String = ""
                urlStr = Request.Cookies("MyCode").Value
                Response.Cookies("MyCode").Expires = Now.AddDays(-2)
                myCookie.Value = "Test01"
                myCookie.Expires = Now.AddDays(365)
            End If
        End If

I want a windows application that will only read the entry for a decision to be taken.

Question by:Woroworo
LVL 18

Expert Comment

by:Gary Davis
ID: 24210796
The web app creates the cookie on the client's browser. The windows app will have to run on the client's PC to get to the cookie. It can not run on the web server. Is that what you want to do?
Each browser may implement its cookie storage differently so the windows app will have to be tailored to the browser being used (IE, Firefox, etc). There are cookie apps that are able do that for various browsers. For some examples, see:
Gary Davis

Author Comment

ID: 24214606
>>The web app creates the cookie on the client's browser. The windows app will have to run on the client's PC to >>get to the cookie. It can not run on the web server. Is that what you want to do?

Yes. I want the windows app to to run on the client's PC.


Author Comment

ID: 24214734
I want the windows app to be an independent program running on the client's PC. This is because the output of the reading will determine the decision to be taken within that same windows app.

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Expert Comment

ID: 24554403
Make a simple windows application which reads the cookies directory and searches for the cookie.

LVL 96

Accepted Solution

Bob Learned earned 2000 total points
ID: 24558698
You can use a function from the wininet.dll library.  You are going to need to use the URL that is associated with the cookie to retrieve the values.

' Source:
' http://www.rendelmann.info/blog/CommentView.aspx?guid=bd99bcd5-7088-4d46-801e-c0fe622dc2e5
Imports System
Imports System.Text
Imports System.Runtime.InteropServices
Imports System.Net
Public Class InternetCookies
  <DllImport("wininet.dll", CharSet:=CharSet.Auto, SetLastError:=True)> _
  Private Shared Function InternetGetCookie(ByVal lpszUrlName As String, ByVal lpszCookieName As String, ByVal lpszCookieData As StringBuilder, <MarshalAs(UnmanagedType.U4)> _
    ByRef lpdwSize As Int32) As Boolean
  End Function
  Private Shared Function RetrieveIECookiesForUrl(ByVal url As String) As String
    Dim cookieHeader As New StringBuilder(New String(" "c, 256), 256)
    Dim datasize As Integer = cookieHeader.Length
    If Not (InternetGetCookie(url, Nothing, cookieHeader, datasize)) Then
      If datasize < 0 Then
        Return String.Empty
      End If
      cookieHeader = New StringBuilder(datasize)
      InternetGetCookie(url, Nothing, cookieHeader, datasize)
    End If
    Return cookieHeader.ToString()
  End Function
  Public Shared Function GetCookieContainer(ByVal url As String) As CookieContainer
    Dim container As New CookieContainer()
    Dim uri As New Uri(url)
    ' CookieContainer.SetCookies expects a string with cookie key+value pairs separated
    ' by commas, and not semi-colons.
    Dim cookieHeaders As String = RetrieveIECookiesForUrl(uri.AbsoluteUri).Replace(";", ",")
    If cookieHeaders.Length > 0 Then
      container.SetCookies(uri, cookieHeaders)
    End If
    Return container
  End Function
End Class

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Author Closing Comment

ID: 31573525
Thanks so much. It really solved my problem. God bless you.

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