如何将文件系统中的文件编码为multipart/form-data? [英] How to encode a file from the file system as multipart/form-data?

问题描述

我想让用户在我的图像查看器应用程序中将照片上传到Facebook.如本文所见， Facebook Graph API-使用JavaScript上传照片 ，我必须将我的照片编码为multipart/form-data才能上传.如何在Windows.Storage.StorageFile项目上存档此编码?

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?

推荐答案

您需要打开该照片(类型为Windows.Storage.StorageFile)进行阅读，将其流转换为blob，将其附加到FormData对象中，然后使用任何方式上传您想要的Ajax库(WinJS.xhr，jQuery.ajax等).

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, jQuery.ajax etc).

以下代码比单词更能说明这一点:

Following code illustrates it better than words:

file.openReadAsync().done(function(fileStream) {                
   var fileData = MSApp.createBlobFromRandomAccessStream(file.contentType, fileStream);
   var formData = new FormData();
   formData.append('upload', fileData, file.name);

   ... // send formData as xhr request body
});

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