Re: Automating a POST request
From: Nick Malik (nickmalik_at_hotmail.nospam.com)
Date: 09/08/04
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Date: Wed, 08 Sep 2004 14:47:32 GMT
You ask an odd question, "why won't the button click." But that isn't your
problem.
You are composing a complicated POST request. You've taken great pains to
create a string of parameters, then go through and encode the values in the
parameters without encoding the seperators. You then submit this request to
a server. The results aren't what you expect.
It is fairly clear to me that the server doesn't "like" the POST. It is not
accepting the data you are sending, so it is returning the form page rather
than returning the next page you expect.
Two suggestions:
1) The way you are creating your payload string is nuts.
payload = "txtUserID=" + HttpUtility.UrlEncode(text) + "&txtPassword="
+ HttpUtility.UrlEncode(text) + "&btnGo=clicked&";
this will do the same thing. Note: I do not remember, off the top of
my head, if this is going to be considered a valid string by the web server.
2) Look at the cookies. It looks to me like you are trying to get past a
login page. Most sites handle login by sending a cookie on the login form.
The cookie needs to come back on the Post request. If the login is
successful, other cookies will come back on the response page. You have to
append ALL of these cookies to every subsequent request to the web server.
This is how ASP and ASP.NET work as well. If you intend to login to a web
site that uses cookies for session management, and a large number of sites
do this, you will not be successful until you handle the cookies.
Good Luck,
--- Nick
"James Johnson" <jjohnso9@hotmail.com> wrote in message
news:uSprbQRlEHA.3824@TK2MSFTNGP12.phx.gbl...
> Dear C#Dex,
>
> I am trying to automate a POST to a web page that clicks a button. I
> have been able to hit a target web page and run the web page. However,
> the button on the page does not click. I can set the target web page to
> change to a new URL when I hit it, and that works, but I cannot get the
> button to click based on my POST command. Is there some secret to
> clicking the button? I have a button named btnGo and I set the value of
> btnGo=clicked; however, the button is not clicked. I can, for example,
> provide querystring values and the target web page detects these and
> will perform logic (such as navigating to another page) based upon the
> provided query string, but I can't get the button to click using a POST
> command. The relevant code is shown below:
>
> url= "http://localhost/FirstProject/WebForm2.aspx";
> payload = "txtUserID=text&txtPassword=text&btnGo=clicked&";
>
> WebRequest req = WebRequest.Create(url);
> req.Method = "POST";
> req.ContentType = "application/x-www-form-urlencoded";
>
> StringBuilder UrlEncoded = new StringBuilder();
> Char[] reserved = {'?', '=', '&'};
> byte[] SomeBytes = null;
>
> if (payload != null)
> {
> int i=0, j;
> while(i<payload.Length)
> {
> j=payload.IndexOfAny(reserved, i);
> if (j==-1)
> {
> UrlEncoded.Append(HttpUtility.UrlEncode(payload.Substring(i,
> payload.Length-i))); //URL encodes and appends to the contents of the
> stringbuilder any text remaining in the payload after the last special
> char
> break;
> }
> UrlEncoded.Append(HttpUtility.UrlEncode(payload.Substring(i,
> j-i))); //appends URL encoded text that is between reserved characters
> to the stringbuilder contents
> UrlEncoded.Append(payload.Substring(j,1)); //appends literal
> reserved char to contents of stringbuilder
> i = j+1; //increments index to get text starting point at
> position past the position of the current reserved character
> }
>
> string str = UrlEncoded.ToString();
> SomeBytes = Encoding.UTF8.GetBytes(UrlEncoded.ToString()); //Encodes
> URL string into hexadecimal bytes
> req.ContentLength = SomeBytes.Length; //Gets length of string
> encoded into bytes that is to be sent as a POST request
>
> //The URL plus the encoded variables
> Stream newStream = req.GetRequestStream(); //Create a Stream variable
> so we can write it to the Http stream and initialize it with the encoded
> stream
> newStream.Write(SomeBytes, 0, SomeBytes.Length); //Writes Http stream
> to IP address returned by the URI
> newStream.Close(); //Free up resources by closing connection
> }
> else
> {
> req.ContentLength = 0;
> }
>
> result = req.GetResponse(); //WebResponse get response of what
> happened as a result of the POST that you just wrote to the URI--The
> button is not clicked--the page stays the same instead of navigating to
> the new page!
>
> Stream ReceiveStream = result.GetResponseStream();
> Encoding encode = System.Text.Encoding.GetEncoding("utf-8");
> StreamReader sr = new StreamReader( ReceiveStream, encode );
> Console.WriteLine("\r\nResponse stream received");
> Char[] read = new Char[256];
> int count = sr.Read( read, 0, 256 );
> Console.WriteLine("HTML...\r\n");
> while (count > 0)
> {
> String str = new String(read, 0, count);
> Console.Write(str);
> count = sr.Read(read, 0, 256);
> }
> Console.WriteLine("");
>
> Do you have any suggestions as to why the button won't click? Thanks
> for your help.
>
> James J.
>
>
>
>
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- Next message: Joe: "Book suggestions requested"
- Previous message: Eric Sabine: "Data access application block 3"
- In reply to: James Johnson: "Automating a POST request"
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