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.NET Forum / Languages / VB.NET / November 2006how to make cookies into an array?
Hi, I need several cookies depending of an variable (x), so i defined a HttpCookie() as an array. My problems: 1)I get the error: Object reference not set to an instance of an object. 2)My second question is: how to request those cookies, because there is no name? Thanks André I did: x=5 Dim cok(x) As New HttpCookie 'can't give a name to the cookie .... for k=1 to x cok(k).Value = "cookie" & k Response.Cookies.Add(cok(k)) next ----------------------------------- recovering the cookies? for i=1 to x cok(i) = Request.Cookies("??") next If you are using VB2005, you can switch to one of the Generic collections that includes a key so that you can look up the cookie by name. Dim allCookies As Generic.Dictionary(Of String, HttpCookie) Add new cookies to the dictionary this way: allCookies.Add(cookieName, theCookieItself) Access the cookie this way: theRetrievedCookie = allCookies(cookieName) ----- Tim Patrick - www.timaki.com Start-to-Finish Visual Basic 2005 > Hi, > [quoted text clipped - 21 lines] > cok(i) = Request.Cookies("??") > nex Hi, thanks for replying ... I tried this (it must be a loop because i never don't know in advance how many cookies i need) But i get the error: "value of type string cannot be converted to system.web.httpcookie" How can i give the value of the cookie? Thanks Dim allCookies As Generic.Dictionary(Of String, HttpCookie) Dim i As Integer Dim cc(5) As String For i = 1 To 5 allCookies.Add(cc(i), "test" & i) Next > If you are using VB2005, you can switch to one of the Generic collections > that includes a key so that you can look up the cookie by name. [quoted text clipped - 38 lines] >> cok(i) = Request.Cookies("??") >> next But you are trying to convert "test1" to a cookie. That is a string, not a cookie. You must specifically create an instance of HttpCookie, fill in its constructor or fields as needed, and then store it. I haven't used that object myself, but the code would be something like this. Dim allCookies As Generic.Dictionary(Of String, HttpCookie) Dim oneCookie As HttpCookie Dim i As Integer For counter = 1 To 5 oneCookie = New HttpCookie ' !!! Fill in all of oneCookie's fields here, then... allCookies.Add("test" & counter, oneCookie) Next counter ----- Tim Patrick - www.timaki.com Start-to-Finish Visual Basic 2005 > Hi, > [quoted text clipped - 56 lines] >>> cok(i) = Request.Cookies("??") >>> nex Ok, thanks > But you are trying to convert "test1" to a cookie. That is a string, not a > cookie. You must specifically create an instance of HttpCookie, fill in [quoted text clipped - 75 lines] >>>> cok(i) = Request.Cookies("??") >>>> next Tim, don't become angry (i'm learning), but it still doesn't work ... If i do what you wrote here, i get an error with the line: oneCookie = New HttpCookie the error is: "overload resolution failed because no accessible 'new' accepts this number of arguments" so i tried this (and the error is gone): oneCookie = New HttpCookie("ok") the whole code is: Dim allCookies As New Generic.Dictionary(Of String, HttpCookie) Dim i As Integer Dim oneCookie As HttpCookie For i = 1 To 5 oneCookie = New HttpCookie("ok") oneCookie.Value = i allCookies.Add("test" & i, oneCookie) Next But now, how can i retrieve the cookies? I did: Dim allCookies As New Generic.Dictionary(Of String, HttpCookie) Dim i As Integer Dim cc(5) As String Dim retCookie As HttpCookie For i = 1 To 5 retCookie = allCookies("test" & i) cc(i) = retCookie.Value Response.Write(cc(i) & " ") Next And the error is now: "The given key was not present in the dictionary" Can you help me a last time? Thanks > But you are trying to convert "test1" to a cookie. That is a string, not a > cookie. You must specifically create an instance of HttpCookie, fill in [quoted text clipped - 75 lines] >>>> cok(i) = Request.Cookies("??") >>>> next Since I'm not sure of what you are doing, I'm not fully sure of the answer to give you. Cookies are normally only used in the context of a web page, and ASP.NET exposes two collections of cookies, one through the Request object and one through the Response object. I'm not sure why you want to create your own disconnected set of cookies. I would confirm that you have read up on the HttpCookie object and its related HttpCookieCollection object (instead of Generic.Dictionary). HttpCookie has its own name, so it seems a collection-specified name isn't really necessary. Maybe if you could explain your purpose, it would make the problem easier to diagnose. ----- Tim Patrick - www.timaki.com Start-to-Finish Visual Basic 2005 > Tim, don't become angry (i'm learning), but it still doesn't work ... > [quoted text clipped - 109 lines] >>>>> cok(i) = Request.Cookies("??") >>>>> next Tim, it's ok, i think i understand it now ... > Since I'm not sure of what you are doing, I'm not fully sure of the answer > to give you. Cookies are normally only used in the context of a web page, [quoted text clipped - 127 lines] >>>>>> cok(i) = Request.Cookies("??") >>>>>> next Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. 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