I have been using the following code to upload files on my server as it is doing the job but i want to monitor the Upload Progress Percentage during the opration and Update the UI accordingly to reflect the prgress to the user
uploadFile({File imageFile, String refCode}) async {
// open a bytestream
var stream =
new http.ByteStream(DelegatingStream.typed(imageFile.openRead()));
// get file length
var length = await imageFile.length();
// string to uri
var uri = Uri.parse(
'http://-------------/api/FilesUploadB/?refCode=$refCode');
// create multipart request
var request = new http.MultipartRequest("POST", uri);
// multipart that takes file
var multipartFile = new http.MultipartFile('file', stream, length,
filename: basename(imageFile.path));
// add file to multipart
request.files.add(multipartFile);
// send
var response = await request.send();
// listen for response
response.stream.transform(utf8.decoder).listen((value) {
print(value);
});
//return response.
}
NOTE that the value in the listen is getting me the final return from the WebAPI on the server.
how to achieve that?
Take a look at this example on GitHub. It demonstrates how you can access the current upload progress of your file.
Related
I have an HTTP Action in Azure Logic Apps that calls a StackExchange API, fundamentally, it could be any API that returned GZip or Deflate content by default:
Because the response is neither Plain Text nor JSON the output from the HTTP Action is:
{
"$content-encoding": "gzip",
"$content-type": "application/json; charset=utf-8",
"$content": "H4sIAAAAAAAEAGWPzY7CMAyE38XnqsrPFtq+ClpFoXghEkm6iVtWQrw7Lt3mAEd/Hs+M7+AIfYb+cIeAN2MHcjOaKWNiKCqgSPa6zZ2SFRzt6YzZjJiMd2EiZF0tvjbpuoZe7rrdxuZIC9KNLo5D9B4DLUIl2gpsyDfOeLflvN8JM7kYPnbF6/+WA/ZNYcOAI+Hp5V/eCKv0heVGSwD0SnRcZXQm4ewyM+hBCbmvda3aWjVaS3h8V3Cx2fiYuMePvWZcSrKV8faPSyzF1jmhty64cGbnVjyeRIHcnG0BAAA="
}
If you went to the trouble of passing the $content field through #base64toString() you would end up with the Gzip binary representation of the JSON, and that is as far as I can take it.
Question: How can I either force the HTTP Action to behave like a HttpClient and Accept GZip data and emit the JSON from the Action, or more laboriously take the GZip Base64/Binary data and decompress it before acting further upon it?
I wasn't able to find a way to "solve" the problem directly, so I created an Azure Function that made the request to the URL with the appropriate HttpClientHandler passed into the HttpClient:
#r "Newtonsoft.Json"
using System;
using System.Net;
using Newtonsoft.Json;
public static async Task<object> Run(HttpRequestMessage req, TraceWriter log) {
string jsonContent = await req.Content.ReadAsStringAsync();
dynamic data = JsonConvert.DeserializeObject(jsonContent);
if (data.url == null) {
return req.CreateResponse(HttpStatusCode.BadRequest, new {
error = "Please pass a URL in the input object"
});
}
HttpClientHandler handler = new HttpClientHandler() {
AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate
};
var client = new HttpClient(handler);
var result = await client.GetAsync((string)data.url);
var response = req.CreateResponse(HttpStatusCode.OK);
response.Content = result.Content;
return response;
}
By swapping the built-in HTTP Action from the original question, I was able to get this working:
And the configuration for the Azure Function is as follows:
I have tried to get user profile pic from O365 using Microsoft Graph API. When I used following API it returns only the metadata related to the profile pic.
https://graph.microsoft.com/beta/me/photo
Through https://graph.microsoft.com/beta/me/photo/$value returns a gibberish object which doesn't make any sense. However, I believe that it is the data related to the user profile. Need help to extract those data into base64.
The returned data is the binary data of the image type. If you use JavaScript to retrieve the user photo, please get the photo data as blob type in a XMLHttpRequest, and then retrieve the blob URL from the response. For your reference:
var request = new XMLHttpRequest;
var photoUri=config.endpoints.graphApiUri + "/v1.0/me/photo/$value";
request.open("GET",photoUri);
request.setRequestHeader("Authorization","Bearer "+token);
request.responseType = "blob";
request.onload = function (){
if(request.readyState == 4 && request.status == 200){
var image = document.createElement("img");
var url = window.URL || window.webkitURL;
var blobUrl = url.createObjectURL(request.response);
image.src = blobUrl;
document.getElementById("UserShow").appendChild(image);
}
};
request.send(null);
For making that photo viewable in view we have to convert the response in 64 byte.
I have make this done in by project by below code. Hope this answer useful for someone..
HttpResponseMessage response1 = await httpClient.GetAsync("https://graph.microsoft.com/v1.0/me/photos/96x96/$value");
using (Stream responseStream = await response1.Content.ReadAsStreamAsync())
{
using (FileStream fs = new FileStream(#"D:\image.jpg", FileMode.Create))
{
MemoryStream ms = new MemoryStream();
responseStream.CopyTo(ms);
byte[] buffer = ms.ToArray();
string result = Convert.ToBase64String(buffer);
HttpContext.Session[AppConstants.UserImage] = String.Format("data:image/gif;base64,{0}", result);
responseStream.Close();
}
}
I have a Dart code used to send an HttpRequest with a POST method to my GAE WepApp2 application. The dart code is executed in chromium and serve by Chrome dev editor. I add in my GAE code some headers to avoid the XHR error in the client side.
The dart code send the datas to my GAE app but I can't read the data with self.request.POST.get("language")) and the app never enter in def post(self): section but with self.request.body I can read the data.
Could you explain that and provide some correction to have a full POST compliant code?
dart:
void _saveData() {
HttpRequest request = new HttpRequest(); // create a new XHR
// add an event handler that is called when the request finishes
request.onReadyStateChange.listen((_) {
if (request.readyState == HttpRequest.DONE &&
(request.status == 200 || request.status == 0)) {
// data saved OK.
print(request.responseText);
}
});
// POST the data to the server
var url = "http://127.0.0.1:8080/savedata";
request.open("POST", url, async: false);
String jsonData = JSON.encode({"language":"dart"});
request.send(jsonData);
}
GAE code in my handler:
def savedata(self):
logging.info("test")
logging.info(self.request.body)
logging.info(self.request.POST.get("language"))
def post(self):
logging.info("test 2")
logging.info(self.request.POST.get("language"))
self.response.headers["Access-Control-Allow-Origin"] = "http://127.0.0.1:49981"
self.response.headers["Access-Control-Allow-Methods"] = "POST, GET, OPTIONS"
In Dart, if you don't specify request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded") in your HttpRequest, the data is considered by GAE like a bite stream and you can only read them with self.request.body
If you add the Content-Type header in Dart you need also to change the data formating. In my case I mimic a form sending with POST method so I change String jsonData = JSON.encode({"language":"dart"}); by String jsonData = "language=dart2";
IN GAE python I can now read the data with self.request.POST.get("language")
If you need to send a JSON from DART to GAE, you can encode the string like this:
String jsonData = JSON.encode({"test":"valuetest1"});
String datas = "datas=$jsonData";
request.send(datas);
In GAE you can read the datas like this:
my_json = json.loads(self.request.POST.get("datas"))
logging.info(my_json["test"])
The complete code:
Dart
void _saveData2() {
String url = "http://127.0.0.1:8080/savedata";
HttpRequest request = new HttpRequest()
..open("POST", url, async: true)
..setRequestHeader("Content-Type", "application/x-www-form-urlencoded")
..responseType = "arraybuffer";
String jsonData = JSON.encode({"test":"valuetest1"});
String datas = "datas=$jsonData";
request.send(datas);
}
GAE
class PageHandler(webapp2.RequestHandler):
def savedata(self):
self.response.headers.add_header('Access-Control-Allow-Origin', '*')
self.response.headers['Content-Type'] = 'application/json'
#logging.info(self.request)
my_json = json.loads(self.request.POST.get("datas"))
logging.info(my_json["test"])
I have a problem with large file download from the web api to the win forms app. On the win form app I'm using HttpClient for grabbing data. I have following code on server side:
[HttpPost]
[Route]
public async Task<HttpResponseMessage> GetBackup(BackupRequestModel request)
{
HttpResponseMessage response;
try
{
response = await Task.Run<HttpResponseMessage>(() =>
{
var directory = new DirectoryInfo(request.Path);
var files = directory.GetFiles();
var lastCreatedFile = files.OrderByDescending(f => f.CreationTime).FirstOrDefault();
var filestream = lastCreatedFile.OpenRead();
var fileResponse = new HttpResponseMessage(HttpStatusCode.OK);
fileResponse.Content = new StreamContent(filestream);
fileResponse.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
return fileResponse;
});
}
catch (Exception e)
{
logger.Error(e);
response = Request.CreateResponse(HttpStatusCode.InternalServerError);
}
return response;
}
on client side:
private async void btnStart_Click(object sender, EventArgs e)
{
var requestModel = new BackupRequestModel();
requestModel.Username = txtUsername.Text;
requestModel.Password = txtPassword.Text;
requestModel.Path = txtServerPath.Text;
var client = new HttpClient();
var result = await client.PostAsJsonAsync("http://localhost:50116/api/backup", requestModel);
var stream = await result.Content.ReadAsStreamAsync();
var localPath = #"d:\test\filenew.bak";
var fileStream = File.Create(localPath);
stream.CopyTo(fileStream);
fileStream.Close();
stream.Close();
fileStream.Dispose();
stream.Dispose();
client.Dispose();
}
}
This is actually working, but the purpose of this program is to grab large files over 3GB and save it to the client.
I have tried this on files sized 630MB what I notice is: When I call web api with http client, http client actually loads 630MB in the memory stream, and from the memory stream to the file stream, but when I try to load a different file I'm getting OutOfMemoryException. This is happening because the application doesn't release memory from the previous loaded file. I can see in task manager that it is holding 635MB of ram memory.
My question is how can I write data directly from HttpClient to file without using memory stream, or in other words how can I write data to file while HttpClient is downloading data?
To make the request, use a SendAsync overload that allows you to specify a HttpCompletionOption and use ResponseHeadersRead. You'll have to manually build the request though, without using the PostAsJsonAsync convenience method.
I am trying to access google places api from appengine using code like this:
String PLACES_DETAILS_URL = "https://maps.googleapis.com/maps/api/place/details/json";
// setup up the HTTP transport
HttpTransport transport = new UrlFetchTransport();
// add default headers
GoogleHeaders defaultHeaders = new GoogleHeaders();
transport.defaultHeaders = defaultHeaders;
transport.defaultHeaders.put("Content-Type", "application/json");
JsonHttpParser parser = new JsonHttpParser();
parser.jsonFactory = new JacksonFactory();
transport.addParser(parser);
// build the HTTP GET request and URL
HttpRequest request = transport.buildGetRequest();
request.setUrl(PLACES_DETAILS_URL);
GenericData data = new GenericData();
data.put("reference", restaurantGoogleId);
data.put("sensor", "false");
data.put("key", ApplicationConstants.GoogleApiKey);
JsonHttpContent content = new JsonHttpContent();
content.jsonFactory=new JacksonFactory();
content.data = data;
request.content = content;
try {
HttpResponse response = request.execute();
String r = response.parseAsString();
r=r;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
I don't know even if this is the recommended way. If so, why this doesn't work?If I put a request in the browser directly it works, but with this code it always returns me "Request Denied".
Thanks in advance.
At the end it was easy, I mixed get and post verbs:
HttpTransport transport = new UrlFetchTransport();
// add default headers
GoogleHeaders defaultHeaders = new GoogleHeaders();
transport.defaultHeaders = defaultHeaders;
transport.defaultHeaders.put("Content-Type", "application/json");
JsonCParser parser = new JsonCParser();
parser.jsonFactory = new JacksonFactory();
transport.addParser(parser);
// build the HTTP GET request and URL
HttpRequest request = transport.buildGetRequest();
request.setUrl("https://maps.googleapis.com/maps/api/place/details/json?reference=CmRYAAAAciqGsTRX1mXRvuXSH2ErwW-jCINE1aLiwP64MCWDN5vkXvXoQGPKldMfmdGyqWSpm7BEYCgDm-iv7Kc2PF7QA7brMAwBbAcqMr5i1f4PwTpaovIZjysCEZTry8Ez30wpEhCNCXpynextCld2EBsDkRKsGhSLayuRyFsex6JA6NPh9dyupoTH3g&sensor=true&key=<APIKEY>");
try {
HttpResponse response = request.execute();
String r = response.parseAsString();