Call image upload web service ASP.NET-android using Retrofit

Question

I am trying to upload an image file in the folder from android to asp.net(Web Service- .asmx file) using retrofit.

I have created the web method for that and that web method is working appropriately and I tested on postman also.

But when I tried to upload from android then it displays the "500 Internal Server Error"

**Web Method (ASP.NET .asmx file)**

---------------------------------------

 

[WebMethod]

public void UploadImage_http()

{

var request = HttpContext.Current.Request;

var photo = request.Files["photo"];

photo.SaveAs(HttpContext.Current.Server.MapPath("images/thumbnail/"+photo.FileName));

JavaScriptSerializer js = new JavaScriptSerializer();

Feed feed = new Feed();

feed.err = false;

feed.err_message = "inserted success";

Context.Response.Write(js.Serialize(feed));

}

 

 

Android Side Code

------------------------------------------

API Interface

@Multipart

@POST("/FeedAPI.asmx/UploadImage_http")

public void upload(@Part("photo") MultipartBody.Part photo, Callback<Feed> callback);

API Call

public void btnSelectSave(View view)

{

File file = new File(selectedImagePath);

// selectedImagePath contains the path of the image.

Toast.makeText(this, file.getName(), Toast.LENGTH_SHORT).show();

RequestBody photoContent = RequestBody.create(MediaType.parse("multipart/form-data"),file);

MultipartBody.Part photo = MultipartBody.Part.createFormData("photo",file.getName(),photoContent);

Log.e("DATA_ photos", ""+photo);

retrofitService.getService().upload(photo, new Callback<Feed>() {

@Override

public void success(Feed feed, Response response) {

Toast.makeText(SharePostActivity.this, feed.getErr_message(), Toast.LENGTH_SHORT).show();

}

@Override

public void failure(RetrofitError error) {

Toast.makeText(SharePostActivity.this, error.getMessage(), Toast.LENGTH_SHORT).show();

}

});

}

 

 

Below Method use to get the path and value were store in **selectedImagePath**

 

 

public String getRealPathFromURI(Uri contentUri)

{

String[] proj = {MediaStore.Images.Media.DATA};

CursorLoader loader = new CursorLoader(getApplicationContext(),contentUri,proj,null,null,null);

Cursor cursor = loader.loadInBackground();

int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);

cursor.moveToFirst();

String result = cursor.getString(column_index);

cursor.close();

return result;

}

 

 

Error Occurs:

 

 

I/System.out: [OkHttp] sendRequest<<

D/Retrofit: <--- HTTP 500 http://192.168.43.25:81/FeedAPI.asmx/UploadImage_http (84ms)

: HTTP/1.1 500 Internal Server Error

D/Retrofit: Cache-Control: private

Content-Length: 55

Content-Type: text/plain; charset=utf-8

Date: Thu, 12 Sep 2019 14:21:21 GMT

Server: Microsoft-IIS/10.0

X-Android-Received-Millis: 1568298080946

X-Android-Response-Source: NETWORK 500

X-Android-Selected-Protocol: http/1.1

D/Retrofit: X-Android-Sent-Millis: 1568298080929

X-AspNet-Version: 4.0.30319

X-Powered-By: ASP.NET

D/Retrofit: Object reference not set to an instance of an object.

D/Retrofit: <--- END HTTP (55-byte body)