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POCreate PNG image with C# HttpHandler webservice
 

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    <p>I'd like to be able to create a simple PNG image, say of a red square using a c# web based service to generate the image, called from an <code>&lt;img src="myws.ashx?x=100&gt;</code> HTML element.</p> <p>some example HTML:</p> <pre><code>&lt;hmtl&gt;&lt;body&gt; &lt;img src="http://mysite.com/webservice/rectangle.ashx?size=100"&gt; &lt;/body&gt;&lt;/html&gt; </code></pre> <p>Is there is anyone who can cobble together a simple (working) C# class just to get me started? Once off and going I'm sure I can finish this off to actually do what I want it to do.</p> <ul> <li>End game is to create simple Red/Amber/Green (RAG) embedded status markers for a data driven web page that shows performance metrics etc*</li> <li>I'd like it to use PNG's as I anticipate using transparency in the future*</li> <li>ASP.NET 2.0 C# solution please... (I don't have a production 3.5 box yet)</li> </ul> <p>tia</p> <p><strong>SOLUTION</strong></p> <p>rectangle.html</p> <pre><code>&lt;html&gt; &lt;head&gt;&lt;/head&gt; &lt;body&gt; &lt;img src="rectangle.ashx" height="100" width="200"&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>rectangle.ashx</p> <pre><code>&lt;%@ WebHandler Language="C#" Class="ImageHandler" %&gt; </code></pre> <p>rectangle.cs</p> <pre><code>using System.Drawing; using System.Drawing.Imaging; using System.IO; using System.Web; public class ImageHandler : IHttpHandler { public void ProcessRequest(HttpContext context) { int width = 600; //int.Parse(context.Request.QueryString["width"]); int height = 400; //int.Parse(context.Request.QueryString["height"]); Bitmap bitmap = new Bitmap(width,height); Graphics g = Graphics.FromImage( (Image) bitmap ); g.FillRectangle( Brushes.Red, 0f, 0f, bitmap.Width, bitmap.Height ); // fill the entire bitmap with a red rectangle MemoryStream mem = new MemoryStream(); bitmap.Save(mem,ImageFormat.Png); byte[] buffer = mem.ToArray(); context.Response.ContentType = "image/png"; context.Response.BinaryWrite(buffer); context.Response.Flush(); } public bool IsReusable { get {return false;} } } </code></pre>
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    1. COcan you make a http handler return an image? lets say a bitmap image or a byte[] buffer to a c# method (code behind file) from where it is called? I am sorry if I sound stupipd but I am new to http handlers
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    2. CO@YP, see the accepted answer?? Otherwise I don't understand what you mean and frankly, I would not know how to do it anyway. My c# is bleh!
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    3. CO@guy Thanks for posting the solution - helped me a lot!
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