C＃通过HTTP发送图像

Question

我有一个用C＃编写的小型HTTP服务器，直到现在我只需要将原始文本发送回发件人。但现在我必须发送一张JPG图片，我不会介意如何。

这是我现在有：

// Read the HTTP Request 
Byte[] bReceive = new Byte[MAXBUFFERSIZE]; 
int i = socket.Receive(bReceive, bReceive.Length, 0); 

//Convert Byte to String 
string sBuffer = Encoding.ASCII.GetString(bReceive); 

// Look for HTTP request 
iStartPos = sBuffer.IndexOf("HTTP", 1); 

// Extract the Command without GET_/ at the beginning and _HTTP at the end 
sRequest = sBuffer.Substring(5, iStartPos - 1 - 5); 
String answer = handleRequest(sRequest); 


// Send the response 
socket.Send(Encoding.UTF8.GetBytes(answer)); 

我认为我必须做某种文件流而不是字符串，但我真的没有胶水..

Answer 1

你想从发文件或位图对象？

MemoryStream myMemoryStream = new MemoryStream(); 
myImage.Save(myMemoryStream); 
myMemoryStream.Position = 0; 

编辑

// Send the response 
SendVarData(socket,memoryStream.ToArray()); 

通过套接字发送的MemoryStream您可以使用给定的here

private static int SendVarData(Socket s, byte[] data) 
{ 
      int total = 0; 
      int size = data.Length; 
      int dataleft = size; 
      int sent; 

      byte[] datasize = new byte[4]; 
      datasize = BitConverter.GetBytes(size); 
      sent = s.Send(datasize); 

      while (total < size) 
      { 
       sent = s.Send(data, total, dataleft, SocketFlags.None); 
       total += sent; 
       dataleft -= sent; 
      } 
      return total; 
} 

Answer 2

你为什么要自己创建一个HttpServer的这种方法吗？为什么不使用开源软件？比如我的：http://webserver.codeplex.com

public class Example  
{ 
    private HttpListener _listener; 

    public void StartTutorial() 
    { 
     _listener = HttpListener.Create(IPAddress.Any, 8081); 
     _listener.RequestReceived += OnRequest; 
     _listener.Start(5); 
    } 

    private void OnRequest(object source, RequestEventArgs args) 
    { 
     IHttpClientContext context = (IHttpClientContext)source; 
     IHttpRequest request = args.Request; 

     IHttpResponse response = request.CreateResponse(context); 
     response.Body = new FileStream("Path\\to\\file.jpg"); 
     response.ContentType = "image\jpeg"; 
     response.Send(); 
    } 

} 

编辑

如果你真的想要做自己做这件事：

string responseHeaders = "HTTP/1.1 200 The file is coming right up!\r\n" + 
"Server: MyOwnServer\r\n" + 
"Content-Length: " + new FileInfo("C:\\image.jpg").Length + "\r\n" + 
"Content-Type: image/jpeg\r\n" + 
"Content-Disposition: inline;filename=\"image.jpg;\"\r\n" + 
"\r\n"; 

//headers should ALWAYS be ascii. Never UTF8 
var headers = Encoding.ASCII.GetBytes(responseHeaders); 
socket.Send(headers, 0, headers.Length); 
socket.SendFile("C:\\image.jpg");