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POvb.net asmx WebService to accept JSON in HTTP-POST using Android
 

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    <p>I am trying to post data to my server (vb.net) using mobile devices. I've researched several great articles on the client-side (Android) including this <a href="http://encosia.com/using-complex-types-to-make-calling-services-less-complex/" rel="nofollow noreferrer">Encosia article</a> and <a href="https://stackoverflow.com/questions/3027066/how-to-send-a-json-object-over-request-with-android">sending JSON object with Android</a>.</p> <p>I have created a sample class:</p> <pre><code>Public Class OneEvaluation Private strEmail As String Public Property email() As String Get Return strEmail End Get Set(ByVal value As String) strEmail = value End Set End Property Private strPassword As String Public Property password() As String Get Return strPassword End Get Set(ByVal value As String) strPassword = value End Set End Property End Class </code></pre> <p>and I've created my webmethod:</p> <pre><code>Public Class AsmxCodebehind Inherits System.Web.Services.WebService &lt;WebMethod()&gt; _ Public Function AndroidTest(ByVal JSON As OneEvaluation) As String ' Dim strSQLInsertCommand As String ' code block Return "whatever" End Function </code></pre> <p></p> <p>It builds (VS2008 sp1) with no errors. I get no response on the android. If I delete the argument 'JSON as OneEvaluation', it will successfully post in a browser and provide a HTML return; but as coded above... the error is: <code> System.InvalidOperationException: AndroidTest Web Service method name is not valid. at System.Web.Services.Protocols.HttpServerProtocol.Initialize() </code></p> <p>FYI, my Android snippet follows:</p> <pre><code>final String URL = "http://www3.myurl.com/JSON/service.asmx/AndroidTest" HttpClient client = new DefaultHttpClient(); HttpConnectionParams.setConnectionTimeout(client.getParams(), 10000); //Timeout Limit HttpResponse response; JSONObject json = new JSONObject(); try{ HttpPost post = new HttpPost(URL); json.put("email", email); json.put("password", pwd); StringEntity se = new StringEntity( "OneEvaluation: " + json.toString()); // post.setEntity(se); post.setHeader("Accept", "application/json"); post.setHeader("Content-type", "application/json; charset=utf-8"); // se.setContentEncoding((Header) new BasicHeader(HTTP.CONTENT_TYPE, "application/json; charset=utf-8")); post.setEntity(new ByteArrayEntity(se.toString().getBytes("UTF8"))); // post.setHeader(OneEvaluation, value) // ResponseHandler responseHandler = new BasicResponseHandler(); response = client.execute(post); /* Checking response */ Log.v("TAG", " JSON onItemClick fired! Position:"); if(response!=null){ Log.v("TAG", " Response :" + response.toString()); // Toast.makeText(v.getContext(), response, Toast.LENGTH_LONG); InputStream in = response.getEntity().getContent(); //Get the data in the entity } } catch(Exception e){ e.printStackTrace(); createDialog("Error", "Cannot Estabilish Connection"); Log.v("TAG", " Cannot Estabilish Connection"); } </code></pre> <p>I haven't seen a complete example with both server-side (except those using jQuery) and client side (especially Android). So I hope to save someone else's weekend!</p> <p>I have resisted using C# on the server side, as my other AJAX/JSON services (including those that return JSON) are in vb (and working).</p> <p>I'm asking for help with the server side error... and any suggestions to clean up the Android JSON HTTP_POST.</p> <p>Many Thanks in advance !</p>
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    1. COI'm still struggling to get this to fire in IIS. I've used Fiddler to confirm that I am sending JSON in the POST. Fiddler shows my post as:<code> POST http://www3.myweb.com/JSON/swUpdate.asmx/SaveProcedureList HTTP/1.1 Accept: application/json Content-type: application/json; charset=utf-8 Content-Length: 44 Host: www3.tidewatertechnology.com Connection: Keep-Alive User-Agent: Apache-HttpClient/UNAVAILABLE (java 1.4) Expect: 100-Continue {"OneEvaluation": {"email":"kiddin","password":"no"}} </code>
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