This example below will take your file, created it in azure and also create thumbnail, it needs to create 2 seperate streams for this. Before the the StreamUploadFile is called we do a check for any image types we want as thumnbnails, there is a probably a better way to this, but I had to get it done quick(quick isn't always slick :). On the GetThumbnail Method on the controller is where it will return the image stream, we also have a fallback in case there is no image to display.
Azure Document Manager Class:
public void StreamUploadFile(string myContainer, string fileName, HttpPostedFileBase file, bool isImage)
{
try
{
// Retrieve reference to a previously created container.
var container = _blobClient.GetContainerReference(myContainer);
// Create the container if it doesn't already exist.
container.CreateIfNotExists();
// Retrieve reference to a blob named "myblob".
var blockBlob = container.GetBlockBlobReference(fileName);
// Create Thumbnail If it is an image
if (isImage)
{
//Stream fileStreamThumb;
// Copy File Stream
MemoryStream fileStreamThumb = new MemoryStream();
file.InputStream.CopyTo(fileStreamThumb);
fileStreamThumb.Seek(0, SeekOrigin.Begin);
string thumbnailUri = String.Concat(Path.GetFileNameWithoutExtension(fileName),
"_thumb" + Path.GetExtension(fileName));
CloudBlockBlob thumbnailBlob = container.GetBlockBlobReference(thumbnailUri);
thumbnailBlob.UploadFromStream(CreateThumbnail(fileStreamThumb));
}
// Create or overwrite the "myblob" blob with contents from a local file.
using (var fileStream = file.InputStream)
{
fileStream.Seek(0, SeekOrigin.Begin);
blockBlob.UploadFromStream(fileStream);
}
}
catch (Exception ex)
{
_exceptionHandler.Invoke(ex);
}
}
// For Image Resizing
public Stream CreateThumbnail(Stream input)
{
var output = new MemoryStream();
ImageResizer.ImageJob i = new ImageResizer.ImageJob(input, output, new ImageResizer.ResizeSettings("width=100;height=100;mode=max"));
i.Build();
output.Seek(0, SeekOrigin.Begin);
return output;
}
public byte[] ReturnFileStream(string filePath, string myContainer, string myFile)
{
try
{
// Retrieve reference to a previously created container.
var container = _blobClient.GetContainerReference(myContainer);
// Retrieve reference to a blob named "photo1.jpg".
var blockBlob = container.GetBlockBlobReference(@myFile);
// Save blob contents to a file.
var sStream = new MemoryStream();
using (var fileStream = File.OpenWrite(filePath))
{
blockBlob.DownloadToStream(sStream);
}
return sStream.ToArray();
}
catch (Exception ex)
{
_exceptionHandler.Invoke(ex);
return null;
}
}
MVC Controler Method:
public FileContentResult GetThumbnail(int id = 0)
{
try
{
// Needs a bit of tidying up
var document = db.Documents.Find(id);
if (document == null) return null;
var container = ((int) document.SurveyID).ToString("D8");
var azureDocument =
new DocumentManager.AzureDocumentManager(
Encryption.DecryptStorageConnectionString(_storageConnection), null);
var temp =
azureDocument.ReturnFileStream(
Path.GetTempPath() + Path.GetFileNameWithoutExtension(document.Name) + "_thumb" +
Path.GetExtension(document.Name), container,
Path.GetFileNameWithoutExtension(document.Name) + "_thumb" + Path.GetExtension(document.Name));
var temp2 = new FileContentResult(temp, "application/text") {FileDownloadName = document.Name};
return temp2;
}
catch (Exception ex)
{
var fileName = Server.MapPath("..\\..\\images") + "\\missing.png";
using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read))
{
// Get Error Image
MemoryStream input = new MemoryStream();
fs.CopyTo(input);
input.Seek(0, System.IO.SeekOrigin.Begin);
// Resize
var output = new MemoryStream();
ImageResizer.ImageJob i = new ImageResizer.ImageJob(input, output, new ImageResizer.ResizeSettings("width=64;height=64;mode=pad"));
i.Build();
output.Seek(0, SeekOrigin.Begin);
// Ouput Image
var temp2 = new FileContentResult(output.ToArray(), "application/text") { FileDownloadName = "error.jpg" };
return temp2;
}
}
finally
{
}
}
Hoepfully that should solve a few headaches or create more in some cases, let me know if there is nothing clear on here :D
