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POReturning a File from a ASP.NET web api to android
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copied!<p>I have a ASP.Net web api which is intended to send a new file over the internet encoded as <code>Base64</code>. To do so, I have a public exposed REST service:</p> <pre><code> string imei = ControllerContext.Request.Headers.GetValues("IMEI").FirstOrDefault(); byte[] FileAsBytes = null; String base64 = null; var svcs = new CrudService.CrudServiceClient(); if (svcs.IsDeviceAccepted(imei)) { FileAsBytes = svcs.DownloadSoftwareVersion(); } if(FileAsBytes != null) { base64 = Convert.ToBase64String(FileAsBytes); } return base64; </code></pre> <p>and a Private service, CRUD service, which communicates directly with the database and the core layers. </p> <p>After some debugging I found out that this service returns the correct lenght, something like <code>4194304 bytes</code>, which seems to correspond to the size of file. However on the client side, I am contacting this service inside a <code>AsyncTask</code>:</p> <pre><code> @Override protected String doInBackground(String... params) { Log.i("UpdateManager: ", "Inside doInBackground"); try { String imei = params[0]; String urlString = "http://10.118.18.50/Mobile.RESTPublicService/api/SoftwareUpdate"; HttpPost post = new HttpPost(urlString); post.addHeader("IMEI", imei); response = httpClient.execute(post); Log.w("Update-Response: ", Integer.toString(response.getStatusLine().getStatusCode()) + " " + response.getStatusLine()); if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { is = response.getEntity().getContent(); IOUtils.copy(is, writer, "UTF-8"); _log.debug(writer.toString()); Log.w("CONTENT: ", writer.toString()); byte[] result = new byte[MAX_FILE_SIZE]; //7242880 b result = decodeBase64(writer.toString()); Log.w("BYTE ARRAY LENGTH: ", Integer.toString(result.length)); } } catch (ClientProtocolException e) { Log.e("Client: ", e.getMessage()); _log.error(e.getMessage()); return FAILED_DUE_TO_EXCEPTION; } catch (IOException e) { Log.e("IO: ", e.getMessage()); _log.error(e.getMessage()); return FAILED_DUE_TO_EXCEPTION; } return response.getStatusLine().toString(); } </code></pre> <p>The interesting point here is the <code>result = decodeBase64(writer.toString());</code> and the decodeBase64 method:</p> <pre><code>protected byte[] decodeBase64(String s) { return Base64.decode(s); } </code></pre> <p>The String <code>s</code> is what I get from the webservice:</p> <pre><code>UEsDBBQACAgIAJteK0IAAAAAAAAAAAAAAAAZAAQAcmVzL2FuaW0vYWN0aXZpdHlmYWRlLnhtbP7KAABdkN9OwjAchc+PbW4YErnwgkRuuSGEek1MDI/SsMkmbF26es8D+AA+hs+hD6Wn0GXKab60/fq/ETK8CyCY4xNgL4TuCUPuyANZkEeyIXvySiaTqnGFbc1RO2MxHr9YU2+PbamRps5cWlmWv1ntKtNQ6ia3psqxXJbOtRul </code></pre> <p>This is not the whole file, but I can see that this is <code>base64 encoded</code></p> <p>When this string is passed inti the <code>decodeBase64</code> method I only get this error message:</p> <p><img src="https://i.stack.imgur.com/9GQsx.png" alt="enter image description here"></p> <p>Then the application terminates. Is this the way to handle <code>Base64</code> String? Can someone suggest how I can create a file from this <code>base64</code> string? My first thought was to convert it to a <code>byte</code> array, and then create a file. </p>

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