private void bStart_Click(object sender, EventArgs e)
{
if (_isRun)
{
DialogResult cancelResult = MessageBox.Show("Are you sure you want to cancel data fetching?", "Cancel fetching?",
MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2);
if (cancelResult == DialogResult.Yes)
{
_isRun = false;
if (_processor != null)
{
_processor.EndStreaming();
}
EnableControls(true);
bStart.Text = "Start";
pbProgress.Value = 0;
if (_results.Count > 0)
{
DialogResult saveResult = MessageBox.Show("Do you want to save fetched data to the CSV file?", "Save data?",
MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2);
if (saveResult == DialogResult.Yes)
{
GenerateCsv(_results);
}
}
}
return;
}
if (!IsValidParameters())
{
return;
}
_isRun = true;
PopulateSettings();
EnableControls(false);
bStart.Text = "Cancel";
WriteLineToTrace("Connecting to stream...");
_results.Clear();
pbProgress.Minimum = 0;
pbProgress.Maximum = _settings.total;
pbProgress.Step = 1;
SandBoxConnection connection = new SandBoxConnection(_settings.username, _settings.password, _settings.account, _settings.source);
connection.ReplyFrom = DateTime.ParseExact(_settings.from, "yyyyMMddHHmm", CultureInfo.InvariantCulture);
connection.ReplyTo = DateTime.ParseExact(_settings.to, "yyyyMMddHHmm", CultureInfo.InvariantCulture);
connection.IsLive = _settings.live;
GnipStreamProcessorAsync processor = GnipStreamProcessorBase.CreateGnipProcessor <GnipStreamProcessorAsync>(connection);
processor.DataReceived += processor_DataReceived;
processor.ErrorHappened += processor_ErrorHappened;
processor.BeginStreaming();
}
private void processor_DataReceived(object sender, DynamicActivityBase activity)
{
GnipStreamProcessorAsync processor = sender as GnipStreamProcessorAsync;
if (processor == null)
{
return;
}
switch (processor.Connection.DataSource)
{
case GnipSources.Twitter:
{
List <string> row = new List <string>(_headers.Count);
foreach (KeyValuePair <string, string> title in _headers)
{
object value = ReflectionHelper.GetNestedPropertyValue(title.Key, activity);
if (value == null)
{
row.Add(string.Empty);
}
else
{
if (ReflectionHelper.IsEnumerable(value) && !ReflectionHelper.IsValidCast(typeof(string), value))
{
IEnumerable enumerable = value as IEnumerable;
string res = string.Empty;
foreach (object item in enumerable)
{
res = string.Format("{0} {1}", res, item);
}
res = res.Trim();
row.Add(res);
}
else
{
row.Add(value.ToString());
}
}
}
_results.Add(row);
WriteLineToTrace("{0} record(s) have been received.", _results.Count);
int index = ((_results.Count - (_settings.append + 1)) < 0) ? 0 : _results.Count - (_settings.append + 1);
int count = ((index + _settings.append) > _results.Count) ? _results.Count - index : _settings.append;
if (_results.Count % _settings.append == 0)
{
GenerateCsv(_results.GetRange(index, count), true);
}
int progress = GetControlPropertyThreadSafe <int>(pbProgress, "Value");
SetControlPropertyThreadSafe(pbProgress, "Value", progress + 1);
if (_results.Count == _settings.total)
{
processor.EndStreaming();
SetControlPropertyThreadSafe(pbProgress, "Value", 0);
SetControlPropertyThreadSafe(bStart, "Text", "Start");
EnableControls(true);
_isRun = false;
}
}
break;
}
}