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POSend POST to a web service and verify some data and send back as JSON
 

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    <p>!<a href="https://i.stack.imgur.com/rJITu.png" rel="nofollow noreferrer"> </a>I am working on a quiz-app that uses a PHP web service to author/host/maintain data for the Android quizes.</p> <p>Heres is the PHP function in question.</p> <p>I am looking for a post in my PHP code.</p> <pre><code>if (isset($_POST['verifyCourse'])){ verifyCourse($_POST['courseCode']);} </code></pre> <p>Any then this points to the function...</p> <pre><code>function verifyCourse($courseCode){ $result = mysql_query("SELECT * FROM Course WHERE CourseCode = \"$courseCode\";"); $rows = array(); while ($r = mysql_fetch_assoc($result)) { $rows = $r; } if($rows == null){ return 0; } else { return json_encode(array('Course' =&gt; $rows)); } } </code></pre> <p>And then on my Android code I am doing this to send a POST to the server called "verifyCourse" but I am getting nothing in return.</p> <p>Android: Function to send HTTP POSTS</p> <pre><code> public ArrayList&lt;HashMap&lt;String, String&gt;&gt; httpPost(List&lt;NameValuePair&gt; valuepair, String code) { // Create a new HttpClient and Post Header HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost("http://mydomain.edu/quiz-app/webservice.php"); StringBuilder builder = new StringBuilder(); try { httppost.setEntity(new UrlEncodedFormEntity(valuepair)); // Execute HTTP Post Request HttpResponse response = httpclient.execute(httppost); StatusLine statusLine = response.getStatusLine(); int statusCode = statusLine.getStatusCode(); /* Checking response */ if (statusCode == 200) { HttpEntity entity = response.getEntity(); InputStream in = entity.getContent(); Log.d("myapp", "response " + response.getEntity()); BufferedReader reader = new BufferedReader(new InputStreamReader(in)); String line; while ((line = reader.readLine()) != null) { builder.append(line); } }else{ Log.e("POST-return", "Failed to download file"); } } catch (Exception e) { } ArrayList&lt;HashMap&lt;String, String&gt;&gt; results = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;(); HashMap&lt;String, String&gt; storage = new HashMap&lt;String, String&gt;(); String value; try{ JSONArray jArray = new JSONArray(builder.toString()); for(int i=0; i&lt;jArray.length(); i++){ JSONObject jsonObject = jArray.getJSONObject(i); value=jsonObject.getString(code); storage = new HashMap&lt;String, String&gt;(); storage.put(code, value); results.add(storage); } } catch (Exception e) { } return results; } </code></pre> <p>I then am using it like this to execute the functionality. /// pass a code from other section of app public void getCourseCodesandVerify(String code) {</p> <pre><code> List&lt;NameValuePair&gt; course_info = new ArrayList&lt;NameValuePair&gt;(2); course_info.add(new BasicNameValuePair("verifyCourse",null)); course_info.add(new BasicNameValuePair("courseCode",code)); httpPost(course_info,null); </code></pre> <p>}</p> <p>Any idea why my code just returns nothing...?</p> <p>Heres what I get back for JSON, how do I process this?</p>
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    1. USwilxjcherokee
    1. USwilxjcherokee
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    1. COIt seems to be your JSON string is not in an array but it could be just the object. Try to print out your JSON and show it here
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      1. USkabuto178
    2. CONot an answer, but you may want to consider using PDO for your database layer, as mysql_* functions are deprecated. Right now, if someone were to curl your page with a courseCode that was, for example, `"1\"; DELETE FROM Course WHERE 1=\"1"`, you could be in for a rude awakening.
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    3. COThis is a project for a university. We are going to beef it up during the summer.
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      1. USwilxjcherokee
 

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