通过WP7上的api登录到MediaWiki

Question

I am trying to create an app for wp7 to login to wikipedia and help with translating the pages. I am stuck right at the beginning since I can't get it to login through the mediawiki API. The relevant part of the code goes like this:

        data.Append("action=login&lgname" + HttpUtility.UrlEncode(textBox1.Text));
        data.Append("&lgpassword=" + HttpUtility.UrlEncode(passwordBox1.Password));

        request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback),request);
        request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);

        public void GetRequestStreamCallback(IAsyncResult asynchronousResult)
        {
           HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
           Stream postStream = request.EndGetRequestStream(asynchronousResult);
           byte[] byteData = UTF8Encoding.UTF8.GetBytes(data.ToString());
           postStream.Write(byteData, 0, data.Length);
           postStream.Close();
        }
        private static void GetResponseCallback(IAsyncResult asynchronousResult)
        {
           HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;

           HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
           Stream streamResponse = response.GetResponseStream();
           StreamReader streamRead = new StreamReader(streamResponse);
           string responseString = streamRead.ReadToEnd();

           streamResponse.Close();
           streamRead.Close();

           response.Close();
    }

The problems are:

On the GetRequestStreamCallback I can't pass the data string from the main function. How do I do this?

On the GetResponseCallback function how do I return the responsestring String so that I can output later?

Answer 1

What you're actually trying to do is two asynchronous operations, one after another - it's worth remembering that the BeginXxx methods return before they've finished - so in your case, you ask for the request stream to write to, and immediately ask for the response, so bad things will ensue.

It's possibly worth looking at other examples, such as those in opensource code - you'll see that you don't typically call BeginGetResponse until you've finished writing to the stream returned by EndGetRequestStream