Provides utility methods for getting social networks from Twitter.
Пример #1
0
        EnumerateJsonValues
        (
            String url,
            String jsonName,
            Int32 maximumValues,
            Boolean skipMostPage1Errors,
            RequestStatistics requestStatistics,
            ReportProgressHandler reportProgressHandler,
            CheckCancellationPendingHandler checkCancellationPendingHandler
        )
        {
            // Note:
            //
            // The logic in this method is similar to the logic in
            // EnumerateSearchStatuses().  In fact, at one time all enumeration was
            // done through this EnumerateJsonValues() method.
            // EnumerateSearchStatuses() was created only when version 1.1 of the
            // Twitter API introduced yet another paging scheme, one that differs
            // from the cursor scheme that this method handles.
            //
            // A possible work item is to recombine the two methods into one,
            // possibly by using a delegate to handle the different paging schemes.

            Debug.Assert(!String.IsNullOrEmpty(url));
            Debug.Assert(maximumValues > 0);
            Debug.Assert(requestStatistics != null);
            AssertValid();

            Int32  iPage              = 1;
            String sCursor            = null;
            Int32  iObjectsEnumerated = 0;

            while (true)
            {
                if (iPage > 1)
                {
                    HttpSocialNetworkUtil.ReportProgress(reportProgressHandler,

                                                         "Getting page {0}."
                                                         ,
                                                         iPage
                                                         );
                }

                String sUrlWithCursor = AppendCursorToUrl(url, sCursor);

                Dictionary <String, Object> oValueDictionary = null;
                Object [] aoObjectsThisPage;

                try
                {
                    Object oDeserializedTwitterResponse =
                        (new JavaScriptSerializer()).DeserializeObject(
                            GetTwitterResponseAsString(sUrlWithCursor,
                                                       requestStatistics, reportProgressHandler,
                                                       checkCancellationPendingHandler));

                    Object oObjectsThisPageAsObject;

                    if (jsonName == null)
                    {
                        // The top level of the Json response contains an array of
                        // objects this method will enumerate.

                        oObjectsThisPageAsObject = oDeserializedTwitterResponse;
                    }
                    else
                    {
                        // The top level of the Json response contains a set of
                        // name/value pairs.  The value for the specified name is
                        // the array of objects this method will enumerate.

                        oValueDictionary = (Dictionary <String, Object>)
                                           oDeserializedTwitterResponse;

                        oObjectsThisPageAsObject = oValueDictionary[jsonName];
                    }

                    aoObjectsThisPage = ( Object [] )oObjectsThisPageAsObject;
                }
                catch (Exception oException)
                {
                    // Rethrow the exception if appropriate.

                    TwitterUtil.OnExceptionWhileEnumeratingJsonValues(
                        oException, iPage, skipMostPage1Errors);

                    // Otherwise, just halt the enumeration.

                    yield break;
                }

                Int32 iObjectsThisPage = aoObjectsThisPage.Length;

                if (iObjectsThisPage == 0)
                {
                    yield break;
                }

                for (Int32 i = 0; i < iObjectsThisPage; i++)
                {
                    yield return(aoObjectsThisPage[i]);

                    iObjectsEnumerated++;

                    if (iObjectsEnumerated == maximumValues)
                    {
                        yield break;
                    }
                }

                iPage++;

                // When the top level of the Json response contains a set of
                // name/value pairs, a next_cursor_str value of "0" means "end of
                // data."

                if (
                    oValueDictionary == null
                    ||
                    !TwitterJsonUtil.TryGetJsonValueFromDictionary(
                        oValueDictionary, "next_cursor_str", out sCursor)
                    ||
                    sCursor == "0"
                    )
                {
                    yield break;
                }

                // Get the next page...
            }
        }
    BeforeGetNetwork()
    {
        AssertValid();

        // TwitterAccessToken caches the access token it reads from disk.  Make
        // sure the latest access token is read.

        TwitterAccessToken oTwitterAccessToken = new TwitterAccessToken();

        // A network should never be requested if the access token hasn't been
        // saved yet.

        String sToken, sSecret;

        if ( !oTwitterAccessToken.TryLoad(out sToken, out sSecret) )
        {
            throw new Exception("Twitter access token not set.");
        }

        m_oTwitterUtil = new TwitterUtil(sToken, sSecret,
            HttpNetworkAnalyzerBase.UserAgent,
            HttpNetworkAnalyzerBase.HttpWebRequestTimeoutMs);
    }