private static void TryCapture(CapturedObj lastFrame)
{
// do capture again only if last frame was >= 1/25 second old
DateTime newTime = DateTime.Now;
if (lastFrame.LastCaptured.AddMilliseconds(40) < newTime)
{
byte[] newFrame = ScreenShot.CaptureImage1024x768(new Point(0, 0), new Point(0, 0), Screen.PrimaryScreen.Bounds);
lastFrame.LastCaptured = newTime;
lastFrame.Image = newFrame;
}
}
public static void SimpleListenerExample(string ipAddress, string port)
{
if (!HttpListener.IsSupported)
{
throw new Exception("该软件只支持Windows XP SP2以上，或者Server 2003以上。");
}
string[] prefixes = new string[] { "http://" + ipAddress + ":" + port + "/" };
CapturedObj lastFrame = new CapturedObj()
{
Image = new byte[] { },
LastCaptured = DateTime.Now,
};
// URI prefixes are required,
// for example "http://contoso.com:8080/index/".
if (prefixes == null || prefixes.Length == 0)
throw new ArgumentException("prefixes");
// Create a listener.
using (HttpListener listener = new HttpListener())
{
// Add the prefixes.
foreach (string s in prefixes)
{
listener.Prefixes.Add(s);
}
listener.Start();
HttpListenerContext context;
HttpListenerRequest request;
HttpListenerResponse response;
while (true) // keep serving image to clients until exit manually by the main thread.
{
// Note: The GetContext method blocks while waiting for a request.
context = listener.GetContext();
request = context.Request;
if (request.RawUrl.ToLower().Contains("image")) // get frame request
{
try
{
response = context.Response;
response.ContentType = "image/jpeg";
TryCapture(lastFrame);
response.ContentLength64 = lastFrame.Image.Length;
Stream output = response.OutputStream;
output.Write(lastFrame.Image, 0, lastFrame.Image.Length);
output.Close();
response.Close();
}
catch (Exception)
{
// sometimes it failed because of client aborted, so ignore output fail.
}
}
else
{
// don't care any other request, such as "/favicon.ico" fired by browser, etc.
}
}
}
}