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POSaving bytes from a .NET WebService from Android
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  1. POSaving bytes from a .NET WebService from Android
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    copied!<p>I have an Android application that calls an .NET WebService that sends back a base64 binary encoded bytes (it's a PDF file).</p> <p>My goal is to save these bytes as a PDF file on the device's sdcard.</p> <p>Here is (a small part) the response I get from the WebService :</p> <pre><code>&lt;base64Binary xmlns="https://www.abcd.com"&gt;JVBERi0xLjMKJdP0zOEKM....&lt;/base64Binary&gt; </code></pre> <p>On my application side, I call this WebService using a POST (for authentification purpose) request. I then get the result and parse it with XmlPullParser. The node value (the bytes) is stored in a StringBuilder (<strong>is it a good choice?</strong>) and I save the file like this :</p> <pre><code>try { FileOutputStream fos = new FileOutputStream(path + "/" + filename); fos.write(nodeValue.toString().getBytes()); fos.close(); } catch(FileNotFoundException ex) { System.out.println("FileNotFoundException : " + ex); } catch(IOException ioe) { System.out.println("IOException : " + ioe); response = false; } </code></pre> <p>When I extract the created PDF file with DDMS, and try to open it with Acrobat Reader, I'm getting an error that the file isn't in the right format.</p> <p>Any idea?</p> <p>======= ANSWER =======</p> <p>To solve my problem, I used the <a href="http://code.google.com/p/ksoap2-android/" rel="nofollow">kSoap2</a> library to get the result from the WebService as a SOAP response. Here is how it did the trick.</p> <pre><code>private static final String SOAP_ACTION = "https://www.foobar.com/getFile"; private static final String METHOD_NAME = "getFile"; private static final String NAMESPACE = "https://www.foobar.com"; private static final String URL = "http://www.foobar.com/ws.asmx"; try { SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME); request.addProperty("username", "foo"); request.addProperty("password", "bar"); request.addProperty("file", "foo.pdf"); SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11); envelope.setOutputSoapObject(request); envelope.dotNet = true; HttpTransportSE androidHttpTransport = new HttpTransportSE(URL); androidHttpTransport.call(SOAP_ACTION, envelope); // Get the result SoapObject resultsRequestSOAP = (SoapObject) envelope.bodyIn; byte[] result = Base64.decode(resultsRequestSOAP.getProperty("getFileResult").toString()); // Save the file try { FileOutputStream fos = new FileOutputStream("/mnt/sdcard/documents/foo.pdf"); fos.write(result); fos.close(); } catch(FileNotFoundException ex) { System.out.println("FileNotFoundException : " + ex); } catch(IOException ioe) { System.out.println("IOException : " + ioe); } } catch (Exception e) { e.printStackTrace(); } </code></pre> <p>The line :</p> <pre><code>byte[] result = Base64.decode(resultsRequestSOAP.getProperty("result").toString()); </code></pre> <p>decodes the result from the String. And the, the byte[] array is saved in a file with :</p> <pre><code>fos.write(result); </code></pre> <p>Voilà! Here are the complete code for folks who have the same problem. This is the WebService signature I call :</p> <pre><code>POST /wsInspection.asmx HTTP/1.1 Host: www.foobar.com Content-Type: text/xml; charset=utf-8 Content-Length: length SOAPAction: "https://www.foobar.com/getFile" &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"&gt; &lt;soap:Body&gt; &lt;getFile xmlns="https://www.foobar.com"&gt; &lt;username&gt;string&lt;/username&gt; &lt;password&gt;string&lt;/password&gt; &lt;file&gt;string&lt;/file&gt; &lt;/getFile&gt; &lt;/soap:Body&gt; </code></pre> <p></p> <p>Response :</p> <pre><code>HTTP/1.1 200 OK Content-Type: text/xml; charset=utf-8 Content-Length: length &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"&gt; &lt;soap:Body&gt; &lt;getFileResponse xmlns="https://www.foobar.com"&gt; &lt;getFileResult&gt;base64Binary&lt;/getFileResult&gt; &lt;/getFileResponse&gt; &lt;/soap:Body&gt; &lt;/soap:Envelope&gt; </code></pre> <p>Hope it helps! Enjoy.</p>
 

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