April 23rd, 2012
雖然網路上沒有完整使用C#與Windows Phone 7.1的範例，不過還是盡量用中文來寫這篇吧。其實網路上英文的資料應該也不少，不論是pyrfeed這裡的Google API列表，還是Unofficial Google Reader API或是R2 google reader on Google code。不過要完整的C#還有Windows Phone 7.1的sample code我也是想辦法K了半天這三份API文件然後不斷的測試，在這裡就列出一些片段的程式碼。
public void MarkArticleAsRead(string newID)
{
string auth_params = string.Format("https://www.google.com/reader/api/0/edit-tag?client=scroll&format=joson&ck=" + DateTime.Now.Ticks.ToString());
HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(auth_params);
httpRequest.Method = "POST";
httpRequest.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";
httpRequest.Headers["Authorization"] = "GoogleLogin auth=" + UserAuth;
httpRequest.Headers["Cookie"] = "SID=" + UserSid;
httpRequest.BeginGetRequestStream(new AsyncCallback(GetPostRequestStreamCallback), httpRequest);
}
不過這裡有一些需要注意的是SID與auth ID需要另外區擷取，這在我其他文章提到。不過接下來就是重點的部分。也就是post data該如何填、該放哪些資料。
private static void GetPostRequestStreamCallback(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
// End the operation
Stream postStream = request.EndGetRequestStream(asynchronousResult);
string postData = "";
postData += "&i=tag:google.com,2005:reader/item/fa42c976c848ecf4";
postData += "&a=user/-/state/com.google/read";
postData += "&s=feed/http://funiphone.pixnet.net/blog/feed/rss";
// Note the token must get within 30 mins
postData += "&T=//mUESPUMtDyZh6BaFXd-CqQ" + LoginToken;
// Convert the string into a byte array.
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
// Write to the request stream.
postStream.Write(byteArray, 0, postData.Length);
postStream.Close();
// Start the asynchronous operation to get the response
request.BeginGetResponse(new AsyncCallback(GetPostResponseCallback), request);
}
在這裡也要注意的是Token需要再30分鐘之內取得~ 建議是呼叫之前馬上去取得token來使用。還有這裡的參數”a=”user 之後有user id 需要填，在這裡就不列出來。 &i=要填的是news 的id，還有&s=要填的是rss ID，你可以在另外一個參數”http://www.google.com/reader/api/0/stream/contents/user” 去取得。最後是結果的部分:
private static void GetPostResponseCallback(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
// End the operation
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
Stream streamResponse = response.GetResponseStream();
StreamReader streamRead = new StreamReader(streamResponse);
string responseString = streamRead.ReadToEnd();
// "responseString" should be "OK" if post succucess
// Close the stream object
streamResponse.Close();
streamRead.Close();
response.Close();
}
這裡重要的是~ 如果這篇文章被mark as read你就會得到OK，但是如果之前已經mark as read你就會得到一個exception，這是需要注意的。
目前先寫到這裡~ 找時間把全部的流程跑一次~ 順便講解一下JSON的部分。