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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 <img src="myws.ashx?x=100> HTML element.
some example HTML:
<hmtl><body>
<img src="http://mysite.com/webservice/rectangle.ashx?size=100">
</body></html>
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.
tia
SOLUTION
rectangle.html
<html>
<head></head>
<body>
<img src="rectangle.ashx" height="100" width="200">
</body>
</html>
rectangle.ashx
<%@ WebHandler Language="C#" Class="ImageHandler" %>
rectangle.cs
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;}
}
}
700
Web services, especially SOAP expect things like an XML envelope with the details of the call in. You'd be better off using a HttpHandler.
Something like this:
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Web;
public class ImageHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
int width = int.Parse(context.Request.QueryString["width"]);
int height = int.Parse(context.Request.QueryString["height"]);
using (Bitmap bitmap = new Bitmap(width,height)) {
...
using (MemoryStream mem = new MemoryStream()) {
bitmap.Save(mem,ImageFormat.Png);
mem.Seek(0,SeekOrigin.Begin);
context.Response.ContentType = "image/png";
mem.CopyTo(context.Response.OutputStream,4096);
context.Response.Flush();
}
}
}
}
This is very rough of course. You'd call it then:
<img src="myhandler.ashx?width=10&height=10"/>
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