在javascript ArrayBuffer中访问Uint8Array

Question

I've got a javascript ArrayBuffer generated from a FileReader ReadAsArrayBuffer method on a jpeg file.

I'm trying to access the UInt32 array of the ArrayBuffer and send to a WCF service (ultimately to be inserted into a database on the server).

I've seen an example here on stackoverflow ( byte array method ) where a UnInt32 array is converted to a byte array which I think would work.

I'm trying to access the [[Uint8Array]] of my arrayBuffer variable below so I can send it to the WCF, but I'm not having much luck. I've tried:

   var arrayBuffer = reader.result[[Uint8Array]];//nope
     var arrayBuffer = reader.result[Uint8Array];//nope
     var arrayBuffer = reader.result.Uint8Array;//nope
     var arrayBuffer = reader.result[1];//nope

Any ideas on how to access that [[Uint8Array]] would be appreciated. When the entire ArrayBuffer is sent to WCF Service I get a 0 byte array -- cant read it

Thanks

Pete

Answer 1

Those properties do not actually exist on the ArrayBuffer object . They are put there by the Dev Tools window for viewing the ArrayBuffer contents.

You need to actually create the TypedArray of your choice through its constructor syntax

 new TypedArray(buffer [, byteOffset [, length]]); 

So in your case if you want Uint8Array you would need to do:

var uint8View = new Uint8Array(arrayBuffer);