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Can you render and image in ASP.NET?

 
 
Lars Netzel
Guest
Posts: n/a
 
      01-05-2005
Hey!

Is there any possibility to render images for the web in asp.net? Is it
hard? Is there something built in or do I need external commercial
components?

best regards
/Lars


 
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Peter Rilling
Guest
Posts: n/a
 
      01-05-2005
What do you mean? The browser renders the images, the server just provides
the path in the form of HTML.

"Lars Netzel" <(E-Mail Removed)> wrote in message
news:#(E-Mail Removed)...
> Hey!
>
> Is there any possibility to render images for the web in asp.net? Is it
> hard? Is there something built in or do I need external commercial
> components?
>
> best regards
> /Lars
>
>



 
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Lars Netzel
Guest
Posts: n/a
 
      01-05-2005
No I mean dynamically creating images.. for example images that needs
language support and stuff like that. I heared a long time ago abot usoem
GIF creator that was part of .NET but I've never seen it...

/lars


"Peter Rilling" <(E-Mail Removed)> skrev i meddelandet
news:(E-Mail Removed)...
> What do you mean? The browser renders the images, the server just
> provides
> the path in the form of HTML.
>
> "Lars Netzel" <(E-Mail Removed)> wrote in message
> news:#(E-Mail Removed)...
>> Hey!
>>
>> Is there any possibility to render images for the web in asp.net? Is it
>> hard? Is there something built in or do I need external commercial
>> components?
>>
>> best regards
>> /Lars
>>
>>

>
>



 
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Kevin Spencer
Guest
Posts: n/a
 
      01-05-2005
> Is there any possibility to render images for the web in asp.net?

Yup.

> Is it hard?


Not for me. Probably for some people. I can't speak for them.

> Is there something built in or do I need external commercial components?


Everything you need is in the CLR. The System.Drawing and
System.Drawing.Imaging namespaces contain all the functionality you need,
combined with, of course, ASP.Net classes.

The first thing you need to do is define what you want to render. If you
want to open an image from a file, or if you want to draw one dynamically.

You would need to create an ASPX page that serves as the "image." You would
link to it as you would any other image, with an HTML image tag. The ASPX
page then creates the image (however), sets the Response.ContentType to
"image/jpg" (or whatever image type you're returning), and then saves the
image to the Response.OutputStream.

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
Neither a follower nor a lender be.

"Lars Netzel" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
> Hey!
>
> Is there any possibility to render images for the web in asp.net? Is it
> hard? Is there something built in or do I need external commercial
> components?
>
> best regards
> /Lars
>



 
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Ken Cox [Microsoft MVP]
Guest
Posts: n/a
 
      01-05-2005
Hi Lars,

There's lots you can do with System.Graphics to create images in memory in
ASP.NET:

http://aspalliance.com/articleViewer.aspx?aId=400&pId=1

http://authors.aspalliance.com/chris...agecounter.asp

Ken



"Lars Netzel" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
> Hey!
>
> Is there any possibility to render images for the web in asp.net? Is it
> hard? Is there something built in or do I need external commercial
> components?
>
> best regards
> /Lars
>


 
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John Puopolo
Guest
Posts: n/a
 
      01-05-2005
Hi...

Yes, you can create an image dynamically in ASP.NET. It's fairly straight forward as well.

The idea is to create an image in memory on the server and stream it back to the client (browser). Now, *if* you were to write that image to disk, you could insert an <img> tag in the output stream and provide a link back to the newly created image that you saved off; however, since you want to send the image bytes back to the browser, you will need an <img> tag in the page HTML whose source is the ASPX page that constructs the image. For example:

<html>
This is some text.
<img src="genImage.aspx">
Isn't that a pretty picture?
</html>

Now, the genImage.aspx code simply uses the System.Drawing, etc. to render an image. Here is a simple example from a sample project I have:

From genImage.aspx:
private void Page_Load(object sender, System.EventArgs e) {
Bitmap objBitmap = new Bitmap(200, 200);
Graphics g = Graphics.FromImage(objBitmap);
g.FillEllipse(Brushes.Red, 0, 0, 200, 200);
objBitmap.Save(Response.OutStrean, ImageFormat.Gif);
}

That's it. You have the full power of the .NET drawing and image libraries at your disposal and can generate as complex an image as you can dream up.

Enjoy...

John Puopolo



"Lars Netzel" <(E-Mail Removed)> wrote in message news:%(E-Mail Removed)...
> Hey!
>
> Is there any possibility to render images for the web in asp.net? Is it
> hard? Is there something built in or do I need external commercial
> components?
>
> best regards
> /Lars
>
>

 
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Lars Netzel
Guest
Posts: n/a
 
      01-05-2005
Nice, thanx!

/Lars

"John Puopolo" <(E-Mail Removed)> skrev i meddelandet
news:(E-Mail Removed)...
Hi...

Yes, you can create an image dynamically in ASP.NET. It's fairly straight
forward as well.

The idea is to create an image in memory on the server and stream it back to
the client (browser). Now, *if* you were to write that image to disk, you
could insert an <img> tag in the output stream and provide a link back to
the newly created image that you saved off; however, since you want to send
the image bytes back to the browser, you will need an <img> tag in the page
HTML whose source is the ASPX page that constructs the image. For example:

<html>
This is some text.
<img src="genImage.aspx">
Isn't that a pretty picture?
</html>

Now, the genImage.aspx code simply uses the System.Drawing, etc. to render
an image. Here is a simple example from a sample project I have:

From genImage.aspx:
private void Page_Load(object sender, System.EventArgs e) {
Bitmap objBitmap = new Bitmap(200, 200);
Graphics g = Graphics.FromImage(objBitmap);
g.FillEllipse(Brushes.Red, 0, 0, 200, 200);
objBitmap.Save(Response.OutStrean, ImageFormat.Gif);
}

That's it. You have the full power of the .NET drawing and image libraries
at your disposal and can generate as complex an image as you can dream up.

Enjoy...

John Puopolo



"Lars Netzel" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
> Hey!
>
> Is there any possibility to render images for the web in asp.net? Is it
> hard? Is there something built in or do I need external commercial
> components?
>
> best regards
> /Lars
>
>


 
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Lars Netzel
Guest
Posts: n/a
 
      01-05-2005
Thank you, that example got me started quite fast... great!

/Lars


"Ken Cox [Microsoft MVP]" <(E-Mail Removed)> skrev i meddelandet
news:%(E-Mail Removed)...
> Hi Lars,
>
> There's lots you can do with System.Graphics to create images in memory in
> ASP.NET:
>
> http://aspalliance.com/articleViewer.aspx?aId=400&pId=1
>
> http://authors.aspalliance.com/chris...agecounter.asp
>
> Ken
>
>
>
> "Lars Netzel" <(E-Mail Removed)> wrote in message
> news:%(E-Mail Removed)...
>> Hey!
>>
>> Is there any possibility to render images for the web in asp.net? Is it
>> hard? Is there something built in or do I need external commercial
>> components?
>>
>> best regards
>> /Lars
>>

>



 
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Lars Netzel
Guest
Posts: n/a
 
      01-05-2005
Do I need to have this in an Aspx page? Is there other ways to call for the picture? I want to do this all in one class.

I guess the ContentType is pretty important but I'm wanting to do an output from a WebControl that also generates the picture. That means I won't have any aspx page avaliable.

/Lars
"John Puopolo" <(E-Mail Removed)> skrev i meddelandet news:(E-Mail Removed)...
Hi...

Yes, you can create an image dynamically in ASP.NET. It's fairly straight forward as well.

The idea is to create an image in memory on the server and stream it back to the client (browser). Now, *if* you were to write that image to disk, you could insert an <img> tag in the output stream and provide a link back to the newly created image that you saved off; however, since you want to send the image bytes back to the browser, you will need an <img> tag in the page HTML whose source is the ASPX page that constructs the image. For example:

<html>
This is some text.
<img src="genImage.aspx">
Isn't that a pretty picture?
</html>

Now, the genImage.aspx code simply uses the System.Drawing, etc. to render an image. Here is a simple example from a sample project I have:

From genImage.aspx:
private void Page_Load(object sender, System.EventArgs e) {
Bitmap objBitmap = new Bitmap(200, 200);
Graphics g = Graphics.FromImage(objBitmap);
g.FillEllipse(Brushes.Red, 0, 0, 200, 200);
objBitmap.Save(Response.OutStrean, ImageFormat.Gif);
}

That's it. You have the full power of the .NET drawing and image libraries at your disposal and can generate as complex an image as you can dream up.

Enjoy...

John Puopolo



"Lars Netzel" <(E-Mail Removed)> wrote in message news:%(E-Mail Removed)...
> Hey!
>
> Is there any possibility to render images for the web in asp.net? Is it
> hard? Is there something built in or do I need external commercial
> components?
>
> best regards
> /Lars
>
>

 
Reply With Quote
 
Kevin Spencer
Guest
Posts: n/a
 
      01-06-2005
Remember that on thg client, its all HTML. The main point is that you need
an image tag that points to the ASPX page that generates the image. It
doesn't matter if that image tag is in a Control or any other element in an
ASPX page. And, of course, you can request the ASPX page that generates the
image all by itself, just as you would request an image from a web server
all by itself.

In other words, you treat the ASPX page that generates the image as if it
WERE an image, in whatever context you use it. To the browser, it will BE an
image, due to the Response.ContentType.

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
Neither a follower nor a lender be.

"Lars Netzel" <(E-Mail Removed)> wrote in message
news:es%(E-Mail Removed)...
Do I need to have this in an Aspx page? Is there other ways to call for the
picture? I want to do this all in one class.

I guess the ContentType is pretty important but I'm wanting to do an output
from a WebControl that also generates the picture. That means I won't have
any aspx page avaliable.

/Lars
"John Puopolo" <(E-Mail Removed)> skrev i meddelandet
news:(E-Mail Removed)...
Hi...

Yes, you can create an image dynamically in ASP.NET. It's fairly straight
forward as well.

The idea is to create an image in memory on the server and stream it back
to the client (browser). Now, *if* you were to write that image to disk,
you could insert an <img> tag in the output stream and provide a link back
to the newly created image that you saved off; however, since you want to
send the image bytes back to the browser, you will need an <img> tag in the
page HTML whose source is the ASPX page that constructs the image. For
example:

<html>
This is some text.
<img src="genImage.aspx">
Isn't that a pretty picture?
</html>

Now, the genImage.aspx code simply uses the System.Drawing, etc. to render
an image. Here is a simple example from a sample project I have:

From genImage.aspx:
private void Page_Load(object sender, System.EventArgs e) {
Bitmap objBitmap = new Bitmap(200, 200);
Graphics g = Graphics.FromImage(objBitmap);
g.FillEllipse(Brushes.Red, 0, 0, 200, 200);
objBitmap.Save(Response.OutStrean, ImageFormat.Gif);
}

That's it. You have the full power of the .NET drawing and image
libraries at your disposal and can generate as complex an image as you can
dream up.

Enjoy...

John Puopolo



"Lars Netzel" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
> Hey!
>
> Is there any possibility to render images for the web in asp.net? Is it
> hard? Is there something built in or do I need external commercial
> components?
>
> best regards
> /Lars
>
>



 
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