yushulx · July 10, 2020 06:38
diff --git a/webcam-server.cs b/webcam-server.cs
 using System;
 using System.IO;
 using System.Text;
 using System.Net;
 using System.Threading.Tasks;
 using OpenCvSharp;
 
 namespace Web
 {
    class Program
    {
        public static HttpListener listener;
        public static string url = "http://localhost:2020/";
        public static string pageData = 
            "<!DOCTYPE>" +
            "<html>" +
            "  <head>" +
            "    <title>HttpListener Example</title>" +
            "  </head>" +
            "  <body>" +
            "<img id=\"image\"/>"+
            " <script type=\"text/javascript\">var image = document.getElementById('image');function refresh() {image.src = \"/image?\" + new Date().getTime();image.onload= function(){setTimeout(refresh, 30);}}refresh();</script>   "+
            "  </body>" +
            "</html>";
 
        public static VideoCapture capture = new VideoCapture(0);
 
 
        public static async Task HandleIncomingConnections()
        {
            while (true)
            {
                HttpListenerContext ctx = await listener.GetContextAsync();
 
                HttpListenerRequest req = ctx.Request;
                HttpListenerResponse resp = ctx.Response;
 
                if ((req.HttpMethod == "GET") &amp;&amp; (req.Url.AbsolutePath.StartsWith("/image"))) {
 
                    resp.ContentType = "image/jpeg";
                    using (Mat image = new Mat()) 
                    {
                        capture.Read(image); 
                        Cv2.ImEncode(".jpg", image, out var imageData);
                        await resp.OutputStream.WriteAsync(imageData, 0, imageData.Length);
                        resp.Close();
                    }
                }
                else {
 
                    // Write the response info
                    byte[] data = Encoding.UTF8.GetBytes(pageData);
                    resp.ContentType = "text/html";
                    resp.ContentEncoding = Encoding.UTF8;
                    resp.ContentLength64 = data.LongLength;
 
                    // Write out to the response stream (asynchronously), then close it
                    await resp.OutputStream.WriteAsync(data, 0, data.Length);
                    resp.Close();
                }
            }
        }
 
        static void Main(string[] args)
        {
            // Create a Http server and start listening for incoming connections
            listener = new HttpListener();
            listener.Prefixes.Add(url);
            listener.Start();
            Console.WriteLine("Listening for connections on {0}", url);
 
            // Handle requests
            Task listenTask = HandleIncomingConnections();
            listenTask.GetAwaiter().GetResult();
 
            // Close the listener
            listener.Close();
        }
    }
 }
	using System;
	using System.IO;
	using System.Text;
	using System.Net;
	using System.Threading.Tasks;
	using OpenCvSharp;

	namespace Web
	{
	class Program
	{
	public static HttpListener listener;
	public static string url = "http://localhost:2020/";
	public static string pageData =
	"<!DOCTYPE>" +
	"<html>" +
	" <head>" +
	" <title>HttpListener Example</title>" +
	" </head>" +
	" <body>" +
	"<img id=\"image\"/>"+
	" <script type=\"text/javascript\">var image = document.getElementById('image');function refresh() {image.src = \"/image?\" + new Date().getTime();image.onload= function(){setTimeout(refresh, 30);}}refresh();</script> "+
	" </body>" +
	"</html>";

	public static VideoCapture capture = new VideoCapture(0);


	public static async Task HandleIncomingConnections()
	{
	while (true)
	{
	HttpListenerContext ctx = await listener.GetContextAsync();

	HttpListenerRequest req = ctx.Request;
	HttpListenerResponse resp = ctx.Response;

	if ((req.HttpMethod == "GET") && (req.Url.AbsolutePath.StartsWith("/image"))) {

	resp.ContentType = "image/jpeg";
	using (Mat image = new Mat())
	{
	capture.Read(image);
	Cv2.ImEncode(".jpg", image, out var imageData);
	await resp.OutputStream.WriteAsync(imageData, 0, imageData.Length);
	resp.Close();
	}
	}
	else {

	// Write the response info
	byte[] data = Encoding.UTF8.GetBytes(pageData);
	resp.ContentType = "text/html";
	resp.ContentEncoding = Encoding.UTF8;
	resp.ContentLength64 = data.LongLength;

	// Write out to the response stream (asynchronously), then close it
	await resp.OutputStream.WriteAsync(data, 0, data.Length);
	resp.Close();
	}
	}
	}

	static void Main(string[] args)
	{
	// Create a Http server and start listening for incoming connections
	listener = new HttpListener();
	listener.Prefixes.Add(url);
	listener.Start();
	Console.WriteLine("Listening for connections on {0}", url);

	// Handle requests
	Task listenTask = HandleIncomingConnections();
	listenTask.GetAwaiter().GetResult();

	// Close the listener
	listener.Close();
	}
	}
	}