private async void BeginSearch()
{
_flickrSearchRequest.Tags = txtSearchBox.Text.Trim();
FlickrSearchResponse response = await _flickrSearchService.GetServiceResponse();
bwDownloadImages.RunWorkerAsync(response);
if (response != null)
{
if (response.stat == Constants.SEARCH_OK)
{
if (response.photos != null && response.photos.total == 0)
{
lblImageResult.Text = "No record found!";
}
else
{
lblImageResult.Text = "Images for " + _flickrSearchRequest.Tags;
}
}
else
{
lblErrorMessage.Text = response.message;
lblImageResult.Text = string.Empty;
}
}
}
/*
* Deserialize the response received as JSON or XML
*/
private FlickrSearchResponse DeserializeResponse(string responseString)
{
FlickrSearchResponse photoResults = null;
try
{
if (_request.Format == eSupportedFormat.JSON)
{
photoResults = JsonConvert.DeserializeObject <FlickrSearchResponse>(responseString);
}
else if (_request.Format == eSupportedFormat.REST)
{
XmlSerializer serializer = new XmlSerializer(typeof(FlickrSearchResponse));
using (var stringreader = new StringReader(responseString))
{
photoResults = (FlickrSearchResponse)serializer.Deserialize(stringreader);
}
}
}
catch (Exception ex)
{
Logger.WriteLog("Exception in function DeserializeResponse");
Logger.WriteLog(ex.Message);
}
return(photoResults);
}
/*
* Function to download the image and resize it to the given size
*/
private int BackgroundProcessPhotoDownload(BackgroundWorker bw, FlickrSearchResponse flickrSearchResponse)
{
int result = 0;
if (flickrSearchResponse != null && flickrSearchResponse.photos != null && flickrSearchResponse.photos.photo != null)
{
foreach (var photo in flickrSearchResponse.photos.photo)
{
if (bw.CancellationPending)
{
break;
}
string baseFlickrUrl = string.Format(Constants.PHOTO_URL,
photo.farm,
photo.server,
photo.id,
photo.secret);
PictureBox eachPictureBox = new PictureBox();
eachPictureBox.Image = Util.DownloadImageFromUrl(baseFlickrUrl);
eachPictureBox.Image = Util.ResizeImage(eachPictureBox.Image, Constants.IMAGE_RESIZE_WIDTH, Constants.IMAGE_RESIZE_HEIGHT);
eachPictureBox.SizeMode = PictureBoxSizeMode.AutoSize;
eachPictureBox.Anchor = AnchorStyles.Top | AnchorStyles.Left;
//Display image in the UI
this.Invoke(new Action(() => this.panelSearchResult.Controls.Add(eachPictureBox)));
}
}
return(result);
}
private void bwDownloadImages_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker helperBW = sender as BackgroundWorker;
FlickrSearchResponse arg = (FlickrSearchResponse)e.Argument;
//Clear all pictures before adding new
this.Invoke(new Action(() =>
{
panelSearchResult.Controls.Clear();
}));
e.Result = BackgroundProcessPhotoDownload(helperBW, arg);
if (helperBW.CancellationPending)
{
e.Cancel = true;
}
}
public async Task <FlickrSearchResponse> GetServiceResponse()
{
FlickrSearchResponse response = null;
try
{
if (_httpResponse != null)
{
var searchResults = await _httpResponse.GetAsync(_request.URI);
if (!string.IsNullOrEmpty(searchResults))
{
response = DeserializeResponse(searchResults);
}
}
}
catch (Exception ex)
{
Logger.WriteLog("Exception in function GetServiceResponse");
Logger.WriteLog(ex.Message);
}
return(response);
}
