|
public static DownloadSerializedJsonData ( string nasaUrl ) : |
||
| nasaUrl | string | |
| return | ||
private void LoadNasaImageList(int pageNumber)
{
try
{
if (pageNumber < 0)
{
pageNumber = 0;
_currentImageNumber = 0;
_displayImageNumber = 0;
}
_images = JsonHelper.DownloadSerializedJsonData(string.Format(NasaLatestImagesUrl, pageNumber));
if (_images == null)
{
throw new Exception("Unable to retrieve the image data");
}
_totalDocImageCount = Convert.ToInt32(_images.Meta.TotalRows);
}
catch (Exception ex)
{
ExceptionManager.WriteException(ex);
throw;
}
}
/// <summary>
/// Overloaded GetImage that allows the retrieval of previous images based on their position in the XML document
/// provided from the nasa.gov website.
/// </summary>
/// <param name="selectedOffset">Position of the image within the node list of images, 1 being the very first (newest)</param>
/// <param name="selectedPage">Page number to retrieve the page that contains the selected image.</param>
public BackgroundImage GetImage(int?selectedOffset, int?selectedPage)
{
try
{
if (!NetworkHelper.InternetAccessIsAvailable())
{
throw new Exception("Attempted to retrieve image, but internet connection was not available.");
}
if (GlobalVariables.LoggingEnabled)
{
ExceptionManager.WriteInformation("Retrieving system screen resolution");
}
GetCurrentScreenResolution();
if (GlobalVariables.LoggingEnabled)
{
ExceptionManager.WriteInformation(string.Format("System screen resolution is: {0}", _currentScreenResolution));
}
if (selectedOffset == null)
{
selectedOffset = DefaultimageOffset;
}
//Get the JSON string data
if (GlobalVariables.LoggingEnabled)
{
ExceptionManager.WriteInformation("Preparing to download image information");
}
var nasaImages = JsonHelper.DownloadSerializedJsonData(string.Format(NasaLatestImagesUrl, selectedPage));
if (nasaImages == null || nasaImages.UberNodes.Length == 0)
{
throw new Exception("Unable to retrieve image data from JSON request");
}
//Get the image node
var imageId = nasaImages.UberNodes[(int)selectedOffset].UberNodeId;
var currentImageFullUrl = string.Format("{0}{1}.json", NasaApiUrl, imageId);
var currentImage = JsonHelper.DownloadImageData(currentImageFullUrl);
if (currentImage == null)
{
throw new Exception(string.Format("Unable to retrieve selected image: {0}", currentImageFullUrl));
}
if (GlobalVariables.LoggingEnabled)
{
ExceptionManager.WriteInformation("Selecting image based on current screen resolution");
}
switch (_currentScreenResolution)
{
case "100x75":
case "226x170":
currentImageFullUrl = string.Format("{0}{1}", NasaImageBaseUrl, currentImage.ImageData[0].LrThumbnail);
break;
case "346x260":
case "360x225":
case "466x248":
case "430x323":
currentImageFullUrl = string.Format("{0}{1}", NasaImageBaseUrl, currentImage.ImageData[0].Crop1X1);
break;
case "800x600":
currentImageFullUrl = string.Format("{0}{1}", NasaImageBaseUrl, currentImage.ImageData[0].Crop2X1);
break;
default:
currentImageFullUrl = string.Format("{0}{1}", NasaImageBaseUrl, currentImage.ImageData[0].FullWidthFeature);
break;
}
var localImageFolderPath = string.Format("{0}\\NASA\\PicOfTheDay", Environment.GetFolderPath(Environment.SpecialFolder.MyPictures));
if (!Directory.Exists(localImageFolderPath))
{
Directory.CreateDirectory(localImageFolderPath);
}
var imageName = currentImage.ImageData[0].FileName;
//Setting the full local image path to save the file
var fullImagePath = string.Format("{0}\\{1}", localImageFolderPath, imageName);
//Download the current image
if (GlobalVariables.LoggingEnabled)
{
ExceptionManager.WriteInformation(string.Format("Preparing to download image: {0}", currentImageFullUrl));
}
if (!DownloadHelper.DownloadImage(fullImagePath, currentImageFullUrl))
{
throw new Exception("Error downloading current image.");
}
//Create BackgroundImage object
var backgroundImage = new BackgroundImage
{
ImageUrl = currentImageFullUrl,
ImageDate = Convert.ToDateTime(currentImage.UberData.PromoDateTime),
ImageDescription = StripHtml(currentImage.UberData.Body),
DownloadedPath = fullImagePath,
ImageTitle =
!string.IsNullOrEmpty(currentImage.ImageData[0].Title)
? currentImage.ImageData[0].Title
: currentImage.UberData.Title
};
return(backgroundImage);
}
catch (Exception ex)
{
ExceptionManager.WriteException(ex);
return(null);
}
}
