check for cookies 1

[lfc77]

I'm trying to do a check to see if the client browser has cookies enabled. But my code below always gives me the value for acceptsCookies = true, whether the machine has cookies enabled or not.

Can anybody help me out with this?


private void Page_Load(object sender, System.EventArgs e)
{
if (!(Page.IsPostBack))
{
//check browser accepts cookies
HttpCookie checkCookies = new HttpCookie("checkCookies");
checkCookies.Values["userName"] = "mike";
Response.Cookies.Add(checkCookies);

bool acceptsCookies = false;

if (Request.Cookies["checkCookies"].Values["userName"] == null)
{
acceptsCookies = false;
}
else
{
acceptsCookies = true;

//Delete test cookie
Response.Cookies["checkCookies"].Expires = DateTime.Now.AddDays(-1);
}

lblInfo.Text = acceptsCookies ? "Accepts cookies" : "Doesn't accept cookies";
}
}



Cheers,

lfc77

 

[yu217171]

You can try using the Request.Cookies["checkCookies"].HasKeys property.

if (Request.Cookies["checkCookies"].HasKeys)
  CookieExists = true;
else
  CookieExists = false;

Keith

 

[cappmgr]

lfc77,
See Checking Whether a Browser Accepts Cookies

http://msdn.microsoft.com/library/d...s/dv_vstechart/html/vbtchASPNETCookies101.asp

Marty

 

[lfc77]

I've already looked at this URL and tried the code with no success. The only thing I can think of is that there are some settings in my web.config that are wrong?

 

[lfc77]

Is it only possible to write cookies to a machine from a live website, or should they be written to your machine even when you are testing on your local machine? I wouldn't have thought you could write them from your local machine (mine doesn't write them), or maybe I am wrong?

 

[cappmgr]

You can write them to your own machine.
In the webconfig under sessionState is the line
cookieless="false"
there?
Marty

 

[lfc77]

Cappmgr,

Are you using the standard web.config file generated by VS.NET? It doesn't write them to my machine at all, and I don't think there is anything wrong with my code (I'm using an example from MSDN.

 

[cappmgr]

I have no access to VS.NET.
The following code will display no cookie for two reasons
if the Cookie Expires is les than or equal to 0 or if cookies are turned off. Maybe it will help. Drop this on your machine and see if it works.

<%@ Page Language="C#" %>
<script runat="server">

    private void Page_Load(object sender, System.EventArgs e)
      {
          //CheckIfBrowserAcceptsCookies();
          if (!Page.IsPostBack)
          {
              lblCookieValue.Text = "Play with cookies";
          }
      }

      void btnSetCookie_Click(object sender, EventArgs e) {
          SetCookie(txtCookieName.Text, txtCookieValue.Text ,Convert.ToInt32(txtCookieExpire.Text));
      }

      public bool SetCookie(string cookiename, string cookievalue ,int iDaysToExpire)
      {
      try
      {
          HttpCookie objCookie = new HttpCookie(cookiename);
          Response.Cookies.Clear();
          Response.Cookies.Add(objCookie);
          objCookie.Values.Add(cookiename,cookievalue);
          DateTime dtExpiry = DateTime.Now.AddDays(iDaysToExpire);
          Response.Cookies[cookiename].Expires =dtExpiry;
      }
          catch( Exception e){
          return false;
      }
          lblCookieValue.Text = "Cookie Changed";
          return true;
      }

      void btnGetCookie_Click(object sender, EventArgs e) {
          lblCookieValue.Text = GetCookie(txtCookieName.Text);
      }

      public string GetCookie(string cookiename){
      string cookyvalue="";
      try{
          cookyvalue= Request.Cookies[cookiename].Value;
      }
          catch(Exception e){
          cookyvalue="";
      }
          if (Request.Cookies[cookiename] != null)
          {
            return cookyvalue;
          }
          else
          {
            return "no cookie ";
          }
      }

      //Not used because it does not care if cookies are turned off  
      public void CheckIfBrowserAcceptsCookies()
      {
          HttpBrowserCapabilities objBrowsCap = new HttpBrowserCapabilities();
          if (Request.Browser.Cookies)
          {
              lblCookieValue.Text = "Your Browser Supports Cookies!";
          }
          else
          {
              lblCookieValue.Text = "Your Browser Does Not Support Cookies!";
          }
      }

</script>
<html>
<head>
</head>
<body>
    <form runat="server">
        <asp:Label id="Label1" runat="server">Cookie Name </asp:Label>
        <asp:TextBox id="txtCookieName" runat="server"></asp:TextBox>
        <br />
        <br />
        <asp:Label id="Label2" runat="server">Cookie Value </asp:Label>
        <asp:TextBox id="txtCookieValue" runat="server"></asp:TextBox>
        <br />
        <br />
        <asp:Label id="Label3" runat="server">Cookie Expires</asp:Label>
        <asp:TextBox id="txtCookieExpire" runat="server"></asp:TextBox>
        <asp:Label id="Label4" runat="server">Less then or equal to 0 will remove the cookie </asp:Label>
        <br />
        <br />
        <asp:Button id="btnSetCookie" onclick="btnSetCookie_Click" runat="server" Text="Set Cookie"></asp:Button>
        <br />
        <br />
        <asp:Button id="btnGetCookie" onclick="btnGetCookie_Click" runat="server" Text="Get Cookie"></asp:Button>
        <br />
        <br />
        <br />
        <asp:Label id="lblCookieValue" runat="server">Label</asp:Label>
    </form>
</body>
</html>

My feeling is this Cookies are written with a Response and you have to hit the client to write a cookie.
Marty

 

[lfc77]

Cappmgr,

Thanks, this seems to work! I've been tearing my hair out trying to get my test for cookies to work!


Cheers,

lfc77