Sending and receiving binary data web apis


You will need a png decoding library for that. An alternative to the above method utilizes the Blob interface to directly construct a Blob with the arraybuffer data. Also you can read a binary file as a Blob by setting the string "blob" to the responseType property.

The magic happens in line 5, which overrides the MIME type, forcing the browser to treat it as plain text, using a user-defined character set. This tells the browser not to parse it, and to let the bytes pass through unprocessed. The example above fetches the byte at offset x within the loaded binary data. The valid range for x is from 0 to filestream. See also downloading files. The following example sends creates a text file on-the-fly and uses the POST method to send the "file" to the server.

This example uses plain text, but you can imagine the data being a binary file instead. When the request completes, the. In the previous sections, we sent a complex type, which Web API deserialized to an instance of a model class. You can also send simple types, such as a string. Before sending a simple type, consider wrapping the value in a complex type instead. This gives you the benefits of model validation on the server side, and makes it easier to extend your model if needed.

The basic steps to send a simple type are the same, but there are two subtle differences. First, in the controller, you must decorate the parameter name with the FromBody attribute. Web API reads the response body at most once, so only one parameter of an action can come from the request body. If you need to get multiple values from the request body, define a complex type.

Not all browsers support this for HTML forms, but you create this format in script as follows:. And here is the script to submit the form value. The only difference from the previous script is the argument passed into the post function.

As the name suggests, ReadAsMultipartAsync is an asynchronous method. To perform work after the method completes, use a continuation task. The collection can contain duplicate keys. The feedback system for this content will be changing soon. Old comments will not be carried over.

If content within a comment thread is important to you, please save a copy. For more information on the upcoming change, we invite you to read our blog post. Note Download the completed project. Note The part boundary includes a random component "" to ensure that the boundary string does not accidentally appear inside a message part.