How to encode a file from the file system as multipart/form-data?
问题 I want to let users upload photos to Facebook in my image viewer app. As seen in this post, Facebook Graph API - upload photo using JavaScript, I have to encode my photos as multipart/form-data to be able to upload them. How to archive this encoding on Windows.Storage.StorageFile items? 回答1: You need to open that photo (of type Windows.Storage.StorageFile ) for reading, convert it's stream to blob, append it to FormData object and upload using whatever Ajax library you want ( WinJS.xhr ,