Hi everybody,

I made a simple Wndows application in VS2005. A form with a button and
a picturebox.
place it in the
picturebox.

Dim xx As New System.IO.MemoryStream(yy)
PictureBox1.Image = Image.FromStream(xx)
PictureBox1.SizeMode = PictureBoxSizeMode.CenterImage

Now i want to do the same in a webapplication, but i can't find a
picturebox, only a image object.
How can i put the incomming bytearray in a image?

Thanks,

Jurgen

Show quote Hide quote You can save the byte array to an image file on the server and make the
'img' element's 'src' attribute point to the image file on the server.
Popular browsers like Microsoft Internet Explorer do not support embedding
of image data into HTML pages.

Hello Herfried K. Wagner [MVP],

Actually, IE does support embedded images in MHT (web archive) files.  I'm
not recommending this, just a comment.

-Boo

Show quoteHide quote

That's true, but I was referring to the 'data' pseudo protocol used in HTML
and supported by some user agents.

Herfried K. Wagner [MVP] wrote:
Thank you both for the input !

Show quote Hide quote A similar approach to what Herfried suggested would be to use an
HttpHandler.

I have attached a sample HttpHandler for images ... to use:

1.) Add the attached class to your project.

2.) Add an image to the default web page.

3.) Set the ImageUrl property of the image control to
"MyImage.aspx?text=SomeText&FileName=Somefilenamewithpngext.png".

4.) Open your web config file and add the following in the <system.web>
section:
<httpHandlers>
    <add
        verb="*"
        path="MyImage.aspx"
        type="YourNamespaceHere.MyImageHandler,YourWebProjectAssemblyNameHere"
    />
</httpHandlers>

5.) Build the project and open the web page you placed the image onto.


Using an HttpHandler allows you to pull an image from practically any
storage area the ASPNET (or authenticating account) has access to and stream
it to the client, regardless of the web browser the user is using (not text
based though, of course).  Using this direct method, you can expand upon it
to stream ANY file to the client, and you are not limited to just images.
Currently, we use HttpHandlers for streaming PDF files that were Crystal
Report reports exported to PDF files.

We use the HttpHandler for images stored in our SQL Server databases.  This
prevents the clutter of images stored on the hard drive in folder structure
and also allows stricter access based on our security system (custom-built)
and allows for DBA's to manage the images instead of our deployment people
(which just happen to be our DBA's lol).

With the HttpHandler I wrote, you can set the text to anything you want as
well as the name of the file.  In the ImageUrl property, set the Text and
FileName query items to what you wish, and the image will display the text.
Another cool feature is if you navigate directly to your web site and
instead of the aspx page, put MyImage.aspx?Text=<some text>&FileName=<some
filename>.png, it will prompt to open the file in your registered PNG file
viewer!  :)

HTH,
Mythran

[attached file: MyImageHandler.vb]

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