Sending and receiving binary data web apis
This method extracts all of the message parts and writes them into the streams provided by the MultipartFormDataStreamProvider. When the method completes, you can get information about the files from the FileData property, which is a collection of MultipartFileData objects.
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.
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Note that this will not decode the image and read the pixels. 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. Consider the following model that represents a status update:.
Notice that the action attribute on the form is the URI of our controller action. Here is the form with some values entered in:. When a user submits a form, the browser navigates away from the current page and renders the body of the response message.
In that case, it makes more sense to send the form data using an AJAX request, so that the page can process the response.
The jQuery submit function replaces the form action with a new function. This overrides the default behavior of the Submit button.
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.