I have a file upload working on html, which calls a post on the api controller.
Could anyone provide / point me in the right direction of the code necessary to get the file out of the post and send that file to an ftp server?
If using an mvc controller is easier that is fine too, although I'd prefer api.
This is the code I currently have - but I don't know how to get an assembled file (an image here, I copy-pasted this from somewhere) out of this data nor how to send it to an ftp server.
[HttpPost]
[Route("api/file/post")]
public async Task<HttpResponseMessage> Post()
{
if (!Request.Content.IsMimeMultipartContent())
throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
try
{
var provider = await Request.Content.ReadAsMultipartAsync(new MultipartMemoryStreamProvider());
var file = provider.Contents.FirstOrDefault();
if (file == null || file.Headers.ContentDisposition.FileName == null)
return Request.CreateResponse(HttpStatusCode.BadRequest);
using (var ms = new MemoryStream())
{
await file.CopyToAsync(ms);
var byteArray = ms.ToArray();
}
return Request.CreateResponse(HttpStatusCode.Created);
}
catch (Exception ex)
{
return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, ex);
}
}
Any help is appreciated. Thanks in advance.
Related
I am new to Web API and HTTP.
I am using the MVC 6 (beta version). I have a proxy service (Web API) which has a POST method to get response from another service with XML content returned. I need to return the response content to the client since the client can't call the service directly.
// In my proxy service
public HttpResponseMessage Post(String content)
{
using ( HttpClient client = new HttpClient() ) {
.......
HttpResponseMessage response = client.PostAsync(uri, content).Result;
// I get everything I need in the "response".
// How to return the response or it body to the client.
// return response;
}
}
II need to return the "response" to the client with no or minimum changes. I tried "return response", or create a new HttpResponseMessage, but I only got something like
{"Headers":[{"Key":"Content-Type","Value":["text/xml"]}]}
in the body.
So is there a simple way to pass the response back to the client? Thanks.
The ASP.NET team is currently working on a "proxy middleware" that does exactly what you're looking for: https://github.com/aspnet/Proxy
Here's how it works internally:
public async Task Invoke(HttpContext context)
{
var requestMessage = new HttpRequestMessage();
if (string.Equals(context.Request.Method, "POST", StringComparison.OrdinalIgnoreCase))
{
var streamContent = new StreamContent(context.Request.Body);
requestMessage.Content = streamContent;
}
// Copy the request headers
foreach (var header in context.Request.Headers)
{
if (!requestMessage.Headers.TryAddWithoutValidation(header.Key, header.Value) && requestMessage.Content != null)
{
requestMessage.Content?.Headers.TryAddWithoutValidation(header.Key, header.Value);
}
}
requestMessage.Headers.Host = _options.Host + ":" + _options.Port;
var uriString = $"{_options.Scheme}://{_options.Host}:{_options.Port}{context.Request.PathBase}{context.Request.Path}{context.Request.QueryString}";
requestMessage.RequestUri = new Uri(uriString);
requestMessage.Method = new HttpMethod(context.Request.Method);
using (var responseMessage = await _httpClient.SendAsync(requestMessage, HttpCompletionOption.ResponseHeadersRead, context.RequestAborted))
{
context.Response.StatusCode = (int)responseMessage.StatusCode;
foreach (var header in responseMessage.Headers)
{
context.Response.Headers.SetValues(header.Key, header.Value.ToArray());
}
foreach (var header in responseMessage.Content.Headers)
{
context.Response.Headers.SetValues(header.Key, header.Value.ToArray());
}
// SendAsync removes chunking from the response. This removes the header so it doesn't expect a chunked response.
context.Response.Headers.Remove("transfer-encoding");
await responseMessage.Content.CopyToAsync(context.Response.Body);
}
}
https://github.com/aspnet/Proxy/blob/dev/src/Microsoft.AspNet.Proxy/ProxyMiddleware.cs
public ActionResult FileLink(string hashname)
{
try
{
const string basePath = #"\\WINDHOVERDOCUMENTS\";
const string adminSamples = #"Beta\students\";
return File(basePath + adminSamples + hashname, "application/force-download", hashname);
}
catch (Exception)
{
return null; //no file
}
}
This action simple force user to download the file when the action is triggered. Everything works fine locally. But after publishing to server, it gives me this error. Below is the screenshot. Can anyone help? Thank you. please zoom in to see the screenshot. Sorry.
I solved that by reading the file to byte array then return file content result
var fileBytes = System.IO.File.ReadAllBytes(#"\\path\fileP12.zip");
return File(fileBytes, "application/zip", "package.zip");
I'm just new in this PCL libraries, I'm developing an iPhone app with Xamarin and I can't find the way to save it on the phone. The closest I get is with PCLStorage but he only saves text.
There is another way that I can save binary files with other procedure.
Thank you.
foreach (images element in json_object)
{
//var nameFile = Path.Combine (directoryname, element.name);
try{
IFile file = await folder_new.GetFileAsync(element.name);
}catch(FileNotFoundException ex ){
RestClient _Client = new RestClient(element.root);
RestRequest request_file = new RestRequest("/images/{FileName}");
request_file.AddParameter("FileName", element.name, ParameterType.UrlSegment);
_Client.ExecuteAsync<MemoryStream>(
request_file,
async Response =>
{
if (Response != null)
{
IFolder rootFolder_new = FileSystem.Current.LocalStorage;
IFile file_new = await rootFolder_new.CreateFileAsync(element.name,CreationCollisionOption.ReplaceExisting);
await file_new.WriteAllTextAsync(Response.Data);
}
});
}
}
Use the IFile.OpenAsync method to get a stream which you can use to read/write binary data. Here's how you would read a file:
IFile file = await folder_new.GetFileAsync(element.name);
using (Stream stream = await file.OpenAsync(FileAccess.Read))
{
// Read stream and process binary data from it...
}
I'm trying to write a WebApi service that receives a file, does a trivial manipulation, and sends the file back. I'm having issues on sending and/or receiving the file from the service.
The issue I'm having is that the file returned from the service is ~1.5x larger than the manipulated file, e.g. when the file is returned it's like 300kb instead of the 200kb it should be.
I assume its being wrapped and or manipulated somehow, and I'm unsure of how to receive it properly. The code for the WebAPI service and the method that calls the web service are included below
In, the WebApi service, when I hit the line return Ok(bufferResult), the file is a byte[253312]
In the method that calls the web service, after the file is manipulated and returned, following the line var content = stream.Result;, the stream has a length of 337754 bytes.
Web API service code
public ConversionController: APIController{
public async Task<IHttpActionResult> TransformImage()
{
if (!Request.Content.IsMimeMultipartContent())
throw new Exception();
var provider = new MultipartMemoryStreamProvider();
await Request.Content.ReadAsMultipartAsync(provider);
var file = provider.Contents.First();
var filename = file.Headers.ContentDisposition.FileName.Trim('\"');
var buffer = await file.ReadAsByteArrayAsync();
var stream = new MemoryStream(buffer);
// [file manipulations omitted;]
// [the result is populated into a MemoryStream named response ]
//debug : save memory stream to disk to make sure tranformation is successfull
/*response.Position = 0;
path = #"C:\temp\file.ext";
using (var fileStream = System.IO.File.Create(path))
{
saveStream.CopyTo(fileStream);
}*/
var bufferResult = response.GetBuffer();
return Ok(bufferResult);
}
}
Method Calling the Service
public async Task<ActionResult> AsyncConvert()
{
var url = "http://localhost:49246/api/conversion/transformImage";
var filepath = "drive/file/path.ext";
HttpContent fileContent = new ByteArrayContent(System.IO.File.ReadAllBytes(filepath));
using (var client = new HttpClient())
{
using (var formData = new MultipartFormDataContent())
{
formData.Add(fileContent, "file", "fileName");
//call service
var response = client.PostAsync(url, formData).Result;
if (!response.IsSuccessStatusCode)
{
throw new Exception();
}
else
{
if (response.Content.GetType() != typeof(System.Net.Http.StreamContent))
throw new Exception();
var stream = response.Content.ReadAsStreamAsync();
var content = stream.Result;
var path = #"drive\completed\name.ext";
using (var fileStream = System.IO.File.Create(path))
{
content.CopyTo(fileStream);
}
}
}
}
return null;
}
I'm still new to streams and WebApi, so I may be missing something quite obvious. Why are the file streams different sizes? (eg. is it wrapped and how do I unwrap and/or receive the stream)
okay, to receive the file correctly, I needed to replace the line
var stream = response.Content.ReadAsStreamAsync();
with
var contents = await response.Content.ReadAsAsync<Byte[]>();
to provide the correct type for the binding
so, the later part of the methods that calls the service looks something like
var content = await response.Content.ReadAsAsync<Byte[]>();
var saveStream = new MemoryStream(content);
saveStream.Position = 0;
//Debug: save converted file to disk
/*
var path = #"drive\completed\name.ext";
using (var fileStream = System.IO.File.Create(path))
{
saveStream.CopyTo(fileStream);
}*/
I am working on an BB app in which I need to maintain a HTTP connection and with a name of image which is stored on server to get the text written in that image document.
I am getting the response in RTF format.
When I directly hit the server on open browser Chrome, I RTF file get downloaded.
Now I needs to perform that programetically,
1) Either convert the bytes which are coming in response in a simple string format so that I can read that.
or
2) Download the file as its happening on the browser manually so that by reading that file I read the information written in the document.
please suggest me how can I read the data from server by hitting any URL?
Currently I am working with this code:
try {
byte []b = send("new_image.JPG");
String s = new String(b, "UTF-8");
System.out.println(s);
} catch (Exception e) {
e.printStackTrace();
}
public byte[] send(String Imagename) throws Exception
{
HttpConnection hc = null;
String imageName = "BasicExp_1345619462234.jpg";
InputStream is = null;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] res = null;
try
{
hc = (HttpConnection) Connector.open("http://webservice.tvdevphp.com/basisexpdemo/webservices/ocr.php?imgname="+imageName);
hc.setRequestProperty("Content-Type", "multipart/form-data;");
hc.setRequestMethod(HttpConnection.GET);
int ch;
StringBuffer sb= new StringBuffer();
is = hc.openInputStream();
while ((ch = is.read()) != -1)
{
bos.write(ch);
sb.append(ch);
}
System.out.println(sb.toString());
res = bos.toByteArray();
}
catch(Exception e){
e.printStackTrace();
}
finally
{
try
{
if(bos != null)
bos.close();
if(is != null)
is.close();
if(hc != null)
hc.close();
}
catch(Exception e2)
{
e2.printStackTrace();
}
}
return res;
}
The response is like:
{\rtf1\ansi\ansicpg1252\uc1\deflang1033\adeflang1033...................
I can read the data but its not formatted, so that i can read that programetically too.
I have done with this task....
Actually the mistake was on server side.
When they were performing OCR, the format parameter was not corrected that was reason.