I need to create a WebAPI method which downloads a file. The file is being correctly downloaded, however the download seems to remain stuck at almost 100% percent in the client browser (ie it doesn't terminate although the file would have downloaded and can be opened). It remains like that for a couple of minutes before terminating. What could the problem be? The following is some test code which replicates my issue
[HttpGet]
public HttpResponseMessage GetFile()
{
string fileName = #"c:\temp\test.zip";
MemoryStream responseStream = new MemoryStream();
using (FileStream source = File.Open(fileName, FileMode.Open))
source.CopyTo(responseStream);
HttpResponseMessage response = new HttpResponseMessage();
response.Content = new StreamContent(responseStream);
response.StatusCode = HttpStatusCode.OK;
response.Content.Headers.ContentType = new MediaTypeHeaderValue(ContentTypeHelper.Instance.GetFileContentType(fileName));
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
response.Content.Headers.ContentDisposition.FileName = fileName;
response.Content.Headers.ContentLength = responseStream.Length;
return response;
}
Looks like you need to rewind the MemoryStream after copying:
MemoryStream responseStream = new MemoryStream();
using (FileStream source = File.Open(fileName, FileMode.Open))
source.CopyTo(responseStream);
responseStream.Seek(0, SeekOrigin.Begin);
Related
HttpResponseMessage returning File from webApi with gibberish characters.
I tried setting encoding on header but not helping.
var dataBytes = File.ReadAllBytes(path);
string fileName = Path.GetFileName(path);
var dataStream = new MemoryStream(dataBytes);
HttpResponseMessage httpResponseMessage = new HttpResponseMessage(HttpStatusCode.OK);
httpResponseMessage.Content = new StreamContent(dataStream);
httpResponseMessage.Content.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment");
httpResponseMessage.Content.Headers.ContentDisposition.FileName = fileName;
httpResponseMessage.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/octet-stream");
httpResponseMessage.Content.Headers.Add("Access-Control-Expose-Headers", "Content-Disposition");
//httpResponseMessage.Content.Headers.Add("Content-Transfer-Encoding", "utf-8");
//httpResponseMessage.Content.Headers.Add("charset", Encoding.ASCII.ToString());
//httpResponseMessage.Content.Headers.Add("charset", "utf-8");
//httpResponseMessage.Content.Headers.ContentEncoding.Add("gzip");
httpResponseMessage.Content.Headers.ContentEncoding.Add("utf-8");
return httpResponseMessage;
All the lines that are commented out were tried and didn't solve the issue.
Thanks.
For one of the implementation, from Java code I am hitting labelary Rest service to convert ZPL formatted code to Image.
I am able to successfully fetch the response. But I am not able to convert the HttpResponse to image file.
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost "http://api.labelary.com/v1/printers/8dpmm/labels/4x6/0/");
byte[] byteArray = Base64.decodeBase64(base64Val.getBytes());
String decodedString = new String(byteArray);
StringEntity requestEntity;
try {
requestEntity = new StringEntity(decodedString);
requestEntity.setContentType("application/x-www-form-urlencoded");
post.setEntity(requestEntity);
HttpResponse response = client.execute(post);
BufferedReader bufferReader = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
#Need suggestions to convert BufferReader to Image
}
Post referring the suggested answer, code looks like:
HttpResponse response = client.execute(post);
InputStream inStream = response.getEntity().getContent();
String dataString = convertStreamToString(inStream);
byte[] imageBytes = javax.xml.bind.DatatypeConverter.parseBase64Binary(dataString);
BufferedImage image = ImageIO.read(new ByteArrayInputStream(imageBytes));
File outputfile = new File("myImage.png");
ImageIO.write(image, "png", outputfile);
use this byte to image converter. past value in datastring and check whether you get the image.
I have this code to upload a rar file to server and this works. But when i download the file from server, contents of file are spoiled. Please tell me how can I fix that. Thanks.
public ActionResult UpFile(HttpPostedFileBase upFile)
{
string fileName = System.IO.Path.GetFileName(upFile.FileName);
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://myhostaddress.com/" + fileName);
request.Method = WebRequestMethods.Ftp.UploadFile;
request.Credentials = new NetworkCredential("myUserName", "MyPassword");
StreamReader streamReader = new StreamReader(upFile.InputStream);
byte[] fileContents = Encoding.Default.GetBytes(streamReader.ReadToEnd());
streamReader.Close();
request.ContentLength = fileContents.Length;
Stream requestStream = request.GetRequestStream();
requestStream.Write(fileContents, 0, fileContents.Length);
requestStream.Close();
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
return RedirectToAction("/");
}
This code is working for me, try it:
var request = (FtpWebRequest)WebRequest.Create(ftp + fileName);
request.Method = WebRequestMethods.Ftp.UploadFile;
request.Credentials = new NetworkCredential(user, pass);
using (var input = File.OpenRead(filePth))
{
using (var output = request.GetRequestStream())
{
input.CopyTo(output);
}
}
var response = (FtpWebResponse)request.GetResponse();
response.Close();
I've searched all documents in google drive api and I can't able to find how to upload a file to folderid using REST APi. Can anyone please help me on this?
public void UploadFiletoDrive()
{
var gmodel = GetAccessToken();
WebRequest request = WebRequest.Create("https://www.googleapis.com/upload/drive/v3/files/?uploadType=media");
request.Method = "POST";
request.Headers["Authorization"] = "Bearer " + gmodel.access_token;
request.ContentType = "image/jpeg";
Stream dataStream = request.GetRequestStream();
FileStream filestream = new FileStream(#"C:\Users\Developer\Downloads\unnamed (2).jpg", FileMode.Open, FileAccess.Read);
byte[] buffer = new byte[4096];
int bytesRead = 0;
while ((bytesRead = filestream.Read(buffer, 0, buffer.Length)) != 0)
{
dataStream.Write(buffer, 0, bytesRead);
}
filestream.Close();
dataStream.Close();
WebResponse response = request.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream());
string responseFromServer = reader.ReadToEnd();
reader.Close();
response.Close();
}
It seems you've missed the Work with Folders docs.
Inserting a file in a folder using Java:
String folderId = "0BwwA4oUTeiV1TGRPeTVjaWRDY1E";
File fileMetadata = new File();
fileMetadata.setName("photo.jpg");
fileMetadata.setParents(Collections.singletonList(folderId));
java.io.File filePath = new java.io.File("files/photo.jpg");
FileContent mediaContent = new FileContent("image/jpeg", filePath);
File file = driveService.files().create(fileMetadata, mediaContent)
.setFields("id, parents")
.execute();
System.out.println("File ID: " + file.getId());
Implementation for other languages are also included like PHP, Python, NodeJS.
Also, check this SO thread for additional reference.
body.setParents(Arrays.asList(new ParentReference().setId(folderId)));
Your sample code is doing a media upload, ie. no metadata, You should be using a multipart upload so you can specify both metadata such as parent folder id and content.
Uploading a file to google drive using REST API has following steps.
Get parent folderID using list API
Create file with parent="folder ID" using create api and get "fileId" in response
upload file to "fileId
Following is javascript code to upload file using REST API
const url = 'https://www.googleapis.com/upload/drive/v3/files/' + fileId + '?uploadType=media';
if(self.fetch){
// console.log("Fetch found, Using fetch");
var setHeaders = new Headers();
setHeaders.append('Authorization', 'Bearer ' + authToken.access_token);
setHeaders.append('Content-Type', mime);
var setOptions = {
method: 'PATCH',
headers: setHeaders,
body: blob
};
fetch(url,setOptions)
.then(response => { if(response.ok){
// console.log("save to google using fetch");
}
else{
// console.log("Response wast not ok");
}
})
.catch(error => {
// console.log("There is an error " + error.message);
});
}
I've verified using System.Text.Encoding.ASCII.GetString(ms.ToArray)); that my memorystream has the expected data.
However using the LinqToCSV nuget library will not generate my csv file. I get no errors or exceptions thrown. I just get an empty file when I'm prompted to open the file.
Here is my Action Method
public FileStreamResult Export(){
var results = _service.GetProperties().Take(3);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
System.IO.TextWriter txt = new System.IO.StreamWriter(ms);
CsvFileDescription inputFileDescription = new CsvFileDescription{
SeparatorChar =',',
FirstLineHasColumnNames = true
}
;
CsvContext csv = new CsvContext();
csv.Write(results,txt,inputFileDescription);
return File(ms , "application/x-excel");
}
I find it interesting, if I change the return type to contentResult, and the return method to Content() and pass it System.Text.Encoding.ASCII.GetString(ms.ToArray)); I do get a browser window showing my data.
Make sure you reset stream position to 0. Also make sure you flush your StreamWriter before that.
Calling the Web API method to return CVS file from JavaScript.
public HttpResponseMessage Bidreport([FromBody]int formData).....
Fill in your IEnumerable<YourObject>query = from LINQ query
....
This is how to return it:
using (var ms = new MemoryStream())
{
using (TextWriter txt = new StreamWriter(ms))
{
var cc = new CsvContext();
cc.Write(query, txt, outputFileDescription);
txt.Flush();
ms.Position = 0;
var fileData = Encoding.ASCII.GetString(ms.ToArray());
var result = new HttpResponseMessage(HttpStatusCode.OK) {Content = new StringContent(fileData)};
result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/x-excel");
return result;
}
}