public override async Task <GetThumbnailResponse> GetThumbnail(GetThumbnailRequest request)
{
throw new System.NotImplementedException();
}
public HttpResponseMessage GetThumbnail([FromUri] GetThumbnailRequest request)
{
if (request == null)
{
throw new ArgumentNullException("request");
}
var pageNumber = request.PageNumber;
if (string.IsNullOrEmpty(request.DocumentId))
{
throw new ArgumentException("documentId must not be null");
}
if (pageNumber < 0)
{
throw new ArgumentException("'pageNumber' must be a value greater than or equals to 0");
}
// Default is page 1
if (pageNumber == 0)
{
pageNumber = 1;
}
if (request.Width < 0 || request.Height < 0)
{
throw new ArgumentException("'width' and 'height' must be value greater than or equal to 0");
}
// Get the image format
var saveFormat = SaveImageFormat.GetFromMimeType(request.MimeType);
// Now load the document
var cache = ServiceHelper.Cache;
using (var document = DocumentFactory.LoadFromCache(cache, request.DocumentId))
{
DocumentHelper.CheckLoadFromCache(document);
DocumentHelper.CheckPageNumber(document, pageNumber);
if (request.Width > 0 && request.Height > 0)
{
document.Images.ThumbnailPixelSize = new LeadSize(request.Width, request.Height);
}
var documentPage = document.Pages[pageNumber - 1];
using (var image = documentPage.GetThumbnailImage())
{
var stream = ImageSaver.SaveImage(image, document.RasterCodecs, saveFormat, request.MimeType, 0, 0);
// If we just return the stream, Web Api will try to serialize it.
// If the return type is "HttpResponseMessage" it will not serialize
// and you can set the content as you wish.
var response = new HttpResponseMessage();
response.Content = new StreamContent(stream);
ServiceHelper.UpdateCacheSettings(response);
return(response);
}
}
}
