returning a picture from a webservice

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Ohad Young - 08 Mar 2005 09:53 GMT

Hi,

I was wondering if it is possible to code a webservice that returns a
picture?
If so, How?

Thanks in advance, Ohad

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Glenn - 08 Mar 2005 10:55 GMT

Perhaps try converting the image to a base64Encoded string in the web
service?

Not sure if this is the best mechanism, but I've used it before to encode
binary data at it seems to work.

HTH

Glenn

> Hi,
>
[quoted text clipped - 3 lines]
>
> Thanks in advance, Ohad

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Denny Britz - 08 Mar 2005 11:59 GMT

You can use WSE + DIME Attachments:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wse/html/6d65ea
5f-eb78-41bc-8964-df1271d9d5a7.asp
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwse/html/wsed
ime.asp

I think that's a better way to attach data than using
base64encoded strings..

Denny

> Perhaps try converting the image to a base64Encoded string in the web
> service?
[quoted text clipped - 13 lines]
>>
>>Thanks in advance, Ohad

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Glenn - 08 Mar 2005 14:44 GMT

Thanks for the info, I'll take a look.

Glenn

> You can use WSE + DIME Attachments:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wse/html/6d
65ea5f-eb78-41bc-8964-df1271d9d5a7.asp

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwse/html/
wsedime.asp

> I think that's a better way to attach data than using
> base64encoded strings..
[quoted text clipped - 18 lines]
> >>
> >>Thanks in advance, Ohad

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Raj Tripathi - 08 Mar 2005 12:51 GMT

If its a small bitmap
1. Convert it to a byte array.
2. Send over wire.
3. Desearialize from a byte array.

If its a big bitmap use WSE Attachments.
Current implementation of WSE uses DIME (which would be replaced in the
future by MTOM)

> Hi,
>
[quoted text clipped - 3 lines]
>
> Thanks in advance, Ohad

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Ohad Young - 08 Mar 2005 14:02 GMT

Hi all,

Thank you all for your quick response.
Since the pictures are small bitmaps, the most suitable option is the
byte array conversion.
Where can I find a code example for it?

Thanks again, Ohad

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Raj Tripathi - 08 Mar 2005 18:05 GMT

On Server:
[WebMethod]
public byte[] GetBitmap()
{
Bitmap bitmap = new Bitmap(@"c:\picture.bmp");
MemoryStream stream = new MemoryStream();
BinaryFormatter formatter = new BinaryFormatter();
formatter.Serialize(stream, bitmap);
return stream.ToArray();
}

On Client:
Bitmap GetBitmap()
{
localhost.BitmapService service = new BitmapService();
byte[] rawBitmap = service.GetBitmap();
BinaryFormatter formatter = new BinaryFormatter();
MemoryStream stream = new MemoryStream(rawBitmap);
return (Bitmap) formatter.Deserialize(stream);
}

Raj Tripathi

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Ohad Young - 09 Mar 2005 07:27 GMT

Hi Raj,

Thanks for the code example.
I'll try it :)

Ohad

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returning a picture from a webservice

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