Convert Silverlight WriteableBitmap to ASP.Net Bitmap

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hi friends, my application take snapshots using webcam and save them in a local folder. so i'm using following code to convert my Silverlight Image and send it through the Web Service. name of my web service is ImageService.

C#

ImageServiceSoapClient client = new ImageServiceSoapClient();

private void source_CaptureImageCompleted(object sender, CaptureImageCompletedEventArgs e)
        {            
            WriteableBitmap bmp = new WriteableBitmap(320, 240);
            bmp = e.Result;
            byte[] buffer = bmp.ToByteArray();            
                     
            client.SaveImageToLocalAsync(buffer, txtUserName.Text);            
        }

and this is my server side code..

C#

[WebMethod]
 public string SaveImageToLocal(byte[] buffer,string name)
 {

     try
     {
         Bitmap bmp = new Bitmap(320, 240);
         using (MemoryStream stream = new MemoryStream(buffer))
         {
             bmp = new Bitmap(stream);
             string saveString = GetFolder() + name + ".jpg";
             bmp.Save(saveString, System.Drawing.Imaging.ImageFormat.Jpeg);
         }

         return "Servers says : Saved..!!";
     }
     catch (Exception ex)
     {
         return "Server says : " + ex.Message;
     }
 }

so when i run this application, i'm getting an exception saying "Server says : Parameter is not valid"..

can anyone please tell me what's wrong with this code? i spent weeks to solve this problem. please back me up..!! thanks..

Posted 2-Apr-13 19:02pm

d_lucifer

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Comments

Sergey Alexandrovich Kryukov 3-Apr-13 1:08am

Why? There is no such thing as ASP.NET bitmap. System.Drawing.Bitmap? But why?
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-04-02T19:10:00

Solution 1

Please see my comment to the question.

There is no such thing as ASP.NET bitmap. You can use WPF bitmaps even in ASP.NET, why not? ASP.NET is a server-side technology, so, there is no .NET UI, and therefore you can use any graphics library.

[EDIT]

For the conversion, see, for example, this code sample:
http://snipplr.com/view/63090/[^].

—SA

Posted 2-Apr-13 19:10pm

Sergey Alexandrovich Kryukov

Updated 4-Apr-13 3:21am

v2

Comments

d_lucifer 3-Apr-13 2:08am

sorry i didn't mean that. i just wanted to give an idea. that's why i wrote it that way, silverlight writablebitmap and asp.net bitmap. yeah i know WriteableBitmap inherits from System.Windows.Media.ImageSource and Bitmap inherits from System.Drawing.Image. but what do you mean? can i use WritableBitmap in ASP.Net ? or Bitmap in Silverlight? how??

Sergey Alexandrovich Kryukov 3-Apr-13 13:19pm

Yes, you can. I would say, WPF, not Silverlight. Using this class, you can generate any thinkable bitmap and either send it in a file or in a stream of the HTTP response. This is all ASP.NET does.
If this is not clear, I'll explain in more detail, but you need to explain your ultimate purpose; what effect to you want to achieve?
Put it this way: with ASP.NET, anything you could do with System.Drawing.Bitmap, you can alternatively do with WPF bitmaps.
—SA

d_lucifer 3-Apr-13 16:06pm

actually i don't know much about WPF and ASP.Net. anyway what i want to do is i need to take a snapshot of a person using the webcam and i want to save that image as jpg or png automatically to a local folder. that local folder should be in my asp.net website project because i'm going to compare that image with another image using EMGU CV. so that i can easily assign that jpg or png to a bitmap and work with my other functions. do you have any idea regarding my requirement?

Sergey Alexandrovich Kryukov 3-Apr-13 16:13pm

Does EMGU require only System.Drawing.Bitmap? That could really be a reason to prefer this type, but why would you get WriteableBitmap in first place? If you get System.Drawing.Bitmap, you would not need WPF...
—SA

d_lucifer 4-Apr-13 0:32am

exactly that's what i want to achieve. i want to get that snapshot as a bitmap. since silverlight doesn't support for System.Drawing.Imaging class, i have to use WriteableBitmap from System.Windows.Media.Imaging class. then i convert that WriteableBitmap to a byte array and send it to the web service. that web service will do the rest.

so can you just refer the above code and tell me what's wrong with it?

or if you know any other way to convert WriteableBitmap to a byte array properly and convert it back to Bitmap format, then please tell me how to do it..

Sergey Alexandrovich Kryukov 4-Apr-13 1:07am

Well, if you need convert, you can do it the way you just described. You can use MemoryStream: write to it, and then read from it. Write as WriteableBitmap, read as System.Drawing.Bitmap.
—SA

d_lucifer 4-Apr-13 8:24am

yes i know that. but there i'm getting an exception, it says "Parameter is not valid" and that's why i posted it here to get a solution from someone. so if you know the answer for that issue please let me know..

Sergey Alexandrovich Kryukov 4-Apr-13 9:21am

You did something wrong. Please see the updated answer, after [EDIT].
—SA