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  1. using System;
  2. using System.Net;
  3. using System.Diagnostics;
  4. using System.IO;
  5.  
  6. namespace Test
  7. {
  8. 	public class ImageDown
  9. 	{
  10. 		public static void Main ()
  11. 		{
  12. 			Do ();
  13.  
  14. 			while (true) {
  15. 			}
  16. 		}
  17.  
  18. 		public static void Do ()
  19. 		{
  20. 			var url = "https://w...content-available-to-author-only...o.jp/intl/ja_ALL/images/logos/images_logo_lg.gif";
  21.  
  22. 			var req = (HttpWebRequest)WebRequest.Create (url);
  23.  
  24. 			req.BeginGetResponse (BeginReadCallBack, req);
  25. 		}
  26.  
  27. 		class State
  28. 		{ 
  29. 			public Stream ResponseStream;
  30. 			public MemoryStream MemoryStream = new MemoryStream ();
  31. 			public byte[] Buffer = new byte[1024];
  32. 		}
  33.  
  34. 		static void BeginReadCallBack (IAsyncResult ar)
  35. 		{
  36. 			var req = (HttpWebRequest)ar.AsyncState;
  37. 			var response = (HttpWebResponse)req.EndGetResponse (ar);
  38. 			var stream = response.GetResponseStream ();
  39. 			var state = new State{ ResponseStream = stream };
  40. 			stream.BeginRead (state.Buffer, 0, state.Buffer.Length, ReadCallback, state);
  41. 		}
  42.  
  43. 		static void ReadCallback (IAsyncResult ar)
  44. 		{
  45. 			var state = (State)ar.AsyncState;
  46.  
  47. 			int readSize = state.ResponseStream.EndRead (ar);
  48.  
  49. 			if (readSize > 0) {
  50. 				state.MemoryStream.Write (state.Buffer, 0, readSize);
  51. 				state.ResponseStream.BeginRead (state.Buffer, 0, state.Buffer.Length, ReadCallback, state);
  52. 			} else {
  53. 				byte[] result = state.MemoryStream.GetBuffer ();
  54. 				Debug.WriteLine ("Complete");
  55. 			}
  56. 		}
  57. 	}
  58. }
  59.  
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https://ideone.com/HTZhS
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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