private static IEnumerator <Int32> CopyStream(AsyncEnumerator <Int64> ae, Stream source, Stream destination, Int32 bufferSize, Action <Int64> reportProgress)
{
Byte[] buffer = new Byte[bufferSize];
Int64 totalBytesRead = 0;
while (true)
{
ae.SetOperationTag("Reading from source stream");
// Read whichever is smaller (number of bytes left to read OR the buffer size)
source.BeginRead(buffer, 0, buffer.Length, ae.End(), null);
yield return(1);
Int32 bytesReadThisTime = source.EndRead(ae.DequeueAsyncResult());
totalBytesRead += bytesReadThisTime;
ae.SetOperationTag("Writing to destination stream");
destination.BeginWrite(buffer, 0, bytesReadThisTime, ae.End(), null);
yield return(1);
destination.EndWrite(ae.DequeueAsyncResult());
if (reportProgress != null)
{
reportProgress(totalBytesRead);
}
if (bytesReadThisTime < buffer.Length)
{
break;
}
}
ae.Result = totalBytesRead;
}
private static IEnumerator<Int32> CopyStream(AsyncEnumerator<Int64> ae, Stream source, Stream destination, Int32 bufferSize, Action<Int64> reportProgress) {
Byte[] buffer = new Byte[bufferSize];
Int64 totalBytesRead = 0;
while (true) {
ae.SetOperationTag("Reading from source stream");
// Read whichever is smaller (number of bytes left to read OR the buffer size)
source.BeginRead(buffer, 0, buffer.Length, ae.End(), null);
yield return 1;
Int32 bytesReadThisTime = source.EndRead(ae.DequeueAsyncResult());
totalBytesRead += bytesReadThisTime;
ae.SetOperationTag("Writing to destination stream");
destination.BeginWrite(buffer, 0, bytesReadThisTime, ae.End(), null);
yield return 1;
destination.EndWrite(ae.DequeueAsyncResult());
if (reportProgress != null) reportProgress(totalBytesRead);
if (bytesReadThisTime < buffer.Length) break;
}
ae.Result = totalBytesRead;
}
private IEnumerator<Int32> GetPhotos(AsyncEnumerator ae, String input) {
WebRequest request = HttpWebRequest.Create(
new Uri(String.Format("http://api.flickr.com/services/rest/?method=flickr.photos.search&api_key={0}&tags={1}&per_page=10",
FlickrKey.Key, input)));
ae.SetOperationTag("Querying " + request.RequestUri);
request.BeginGetResponse(ae.End(), null);
yield return 1;
// Complete the Flickr request (this is guaranteed to run on the GUI thread)
String data;
using (HttpWebResponse response = (HttpWebResponse) request.EndGetResponse(ae.DequeueAsyncResult())) {
using (StreamReader reader = new StreamReader(response.GetResponseStream())) {
data = reader.ReadToEnd();
}
}
ae.SetOperationTag("Starting Storyboard");
EventApmFactory<EventArgs> eventArgsFactory = new EventApmFactory<EventArgs>();
EventHandler storyboardCompletedEventHandler = eventArgsFactory.PrepareOperation(ae.End()).EventHandler;
SearchPanelStoryBoard.Completed += storyboardCompletedEventHandler;
SearchPanelStoryBoard.Begin();
yield return 1;
SearchPanelStoryBoard.Completed -= storyboardCompletedEventHandler;
eventArgsFactory.EndInvoke(ae.DequeueAsyncResult());
PhotoBoard.Width = Application.Current.Host.Content.ActualWidth;
PhotoBoard.Height = Application.Current.Host.Content.ActualHeight - 100.0;
XDocument doc = XDocument.Parse(data);
var photos = from results in doc.Descendants("photo")
select new {
id = results.Attribute("id").Value.ToString(),
farm = results.Attribute("farm").Value.ToString(),
server = results.Attribute("server").Value.ToString(),
secret = results.Attribute("secret").Value.ToString()
};
PhotoBoard.Children.Clear();
Int32 count = 0;
EventApmFactory<OpenReadCompletedEventArgs> openReadCompletedEventArgsFactory = new EventApmFactory<OpenReadCompletedEventArgs>();
foreach (var photo in photos) {
// Create a photo
Border item = (Border) XamlReader.Load(String.Format(CultureInfo.InvariantCulture,
c_template, count,
(PhotoBoard.Width - c_cx) / 2, (PhotoBoard.Height - c_cy) / 2, // Initial position (center of workspace)
c_cx + c_border, c_cy + c_border, // Width and height of photo border
(c_cx + c_border) / 2, (c_cy + c_border) / 2, // Center of rotation
c_cx, c_cy)); // Width and height of photo
WebClient wc = new WebClient();
ae.SetOperationTag("Loading photo " + count);
wc.OpenReadCompleted += openReadCompletedEventArgsFactory.PrepareOperation(ae.End()).EventHandler;
wc.OpenReadAsync(
new Uri(String.Format("http://farm{0}.static.flickr.com/{1}/{2}_{3}_m.jpg", photo.farm, photo.server, photo.id, photo.secret),
UriKind.Absolute), item);
count++;
}
while (count-- > 0) {
yield return 1; // Process each image as it comes back
OnReadCompleted(null, openReadCompletedEventArgsFactory.EndInvoke(ae.DequeueAsyncResult()));
}
}