JSON help needed from devs (1 Viewer)

[corporate_gadfly]

Hi devs,

I need a bit of help implementing a site. The code in my util looks like as follows:

JObject json = GetWebData<JObject>("http://ww3.tvo.org/views/ajax?view_name=video_landing_page&view_display_id=page_1");

Unfortunately, in the logs I'm getting:

[02-18 18:46:36,230] [OnlineVideos] [WARN ] System.Runtime.Serialization.SerializationException: Type 'Newtonsoft.Json.JsonReaderException' in Assembly 'OnlineVideos, Version=1.1.0.1936, Culture=neutral, PublicKeyToken=null' is not marked as serializable.

Server stack trace:
at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter)
at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.Serialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter)
at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck)
at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck)
at System.Runtime.Remoting.Channels.CrossAppDomainSerializer.SerializeMessageParts(ArrayList argsToSerialize)
at System.Runtime.Remoting.Messaging.SmuggledMethodReturnMessage..ctor(IMethodReturnMessage mrm)
at System.Runtime.Remoting.Messaging.SmuggledMethodReturnMessage.SmuggleIfPossible(IMessage msg)
at System.Runtime.Remoting.Channels.CrossAppDomainSink.DoDispatch(Byte[] reqStmBuff, SmuggledMethodCallMessage smuggledMcm, SmuggledMethodReturnMessage& smuggledMrm)
at System.Runtime.Remoting.Channels.CrossAppDomainSink.DoTransitionDispatchCallback(Object[] args)

Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at OnlineVideos.Sites.SiteUtilBase.DiscoverDynamicCategories()

Can one of you try the above code and see if you can reproduce the error? Any ideas how to fix it would be welcome as well.

 

[doskabouter]

Hm, here I get a "Bad JSON escape sequence: \x. Line 1, position 34."

 

[offbyone]

Looks like an exception is thrown and trying to pass the AppDomain, but System.Runtime.Serialization.SerializationException is not serializable. For testing you can disable the separate Appdomain (there is a boolean), I guess doskabouter did that So in summary the JSON from the server seems not valid.

 

[corporate_gadfly]

Thx to both of you. In Firebug I see the response as (cut for brevity):

"\n\x3cdiv id=\"view-id-video_landing_page-page_1\" class=\"view view-video-landing-page view-id-video_landing_page view-display-id-page_1 view-dom-id-1 \"\x3e

So, I can try to search and replace:\x3c with < and \x3e with > and try to use the Parse method to parse it manually.

Thanks again.

 

[corporate_gadfly]

Looks like Newtonsoft.Json does not support hexadecimal escape sequences (or octal escape sequences for that matter). I would be willing to try this patch at least for the hexadecimal support (don't care about the octal part at the moment).

Thoughts?

Following patch works:

Index: OnlineVideos/Newtonsoft.Json/JsonTextReader.cs
===================================================================
--- OnlineVideos/Newtonsoft.Json/JsonTextReader.cs    (revision 1935)
+++ OnlineVideos/Newtonsoft.Json/JsonTextReader.cs    (working copy)
@@ -132,6 +132,19 @@
                  char hexChar = Convert.ToChar(int.Parse(new string(hexValues), NumberStyles.HexNumber, NumberFormatInfo.InvariantInfo));
                  _buffer.Append(hexChar);
                  break;
+                case 'x':
+                  hexValues = new char[2];
+                  for (int i = 0; i < hexValues.Length; i++)
+                  {
+                      if ((currentChar = MoveNext()) != '\0' || !_end)
+                          hexValues[i] = currentChar;
+                      else
+                          throw CreateJsonReaderException("Unexpected end while parsing hexadecimal escape sequence. Line {0}, position {1}.", _currentLineNumber, _currentLinePosition);
+                  }
+
+                  hexChar = Convert.ToChar(int.Parse(new string(hexValues), NumberStyles.HexNumber, NumberFormatInfo.InvariantInfo));
+                  _buffer.Append(hexChar);
+                  break;
                default:
                  throw CreateJsonReaderException("Bad JSON escape sequence: {0}. Line {1}, position {2}.", @"\" + currentChar, _currentLineNumber, _currentLinePosition);
              }

Any protocol for updating Newtonsoft.JSON that I should follow?

 

[offbyone]

Just go with it That's the reason I included the source not the dll. Maybe there is a newer release of those sources I should use? Don't know from when the source I used were.