How to get a Blob object from FilePicker for XHR POST Request?

Question

Hello.
I need to send an image taken from FilePicker via XHR POST Request.
How can I get a [object Blob] from StorageFile class to send it?

Answer 1

Hi Moushen,

The Blog sample scenario 1 gets a Blog from the file picker:

http://code.msdn.microsoft.com/Blob-Sample-0e35889e/sourcecode?fileId=43594&pathId=1754477665

-Jeff

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Jeff Sanders (MSFT)

Answer 2

Hi Jeff, 
The sample outputs not what I want.
I need exactly [object Blob], not 

• [object Windows.Storage.StorageFile] - file
• blob:273324B50F6F - URL.createObjectURL(file)

 Tweet@rama creates a <canvas> and draws an image and finnaly transforms it to blob using canvas.msToBlob() with a comment "Get Blob that is needed for formData and XHR".

Is there any way to transform an image from FilePicker to Blob without using canvases?
Btw Tweet@rama's code didn't work, the Blob I get isn't valid ( image with src = URL.createObjectURL(theBlob) doesn't appear ). 

Thanks.

 

Answer 3

I got  Tweet@rama's code to work, so I get [object Blob] as I need, but it wasn't that what I need.
Now I need [object File] and I moved the thread to http://social.msdn.microsoft.com/Forums/en-US/winappswithhtml5/thread/05921f3a-bee7-4fa3-80ff-85bff1161b4b .