Uploading to Azure - asp.net

Question

I'm having an issue trying to directly upload a file to azure blob storage. I am using ajax calls to send post requests to an ashx handler to upload a blob in chunks. The issue I am running into is the handler isn't receiving the filechunk being sent from the ajax post.
I can see the page is receiving the post correctly from looking at the request in firebug,
-----------------------------265001916915724 Content-Disposition: form-data; >name="Slice"; filename="blob" Content-Type: application/octet-stream
I noticed the input stream on the handler has the filechunk, including additional bytes from the request. I tryed to read only the filechunk's size from the inputstream, however this resulted in an corrupt file.
I got the inspiration from http://code.msdn.microsoft.com/windowsazure/Silverlight-Azure-Blob-3b773e26 , I simply converted it from MVC3 to using standard aspx.
Here is the call using ajax to send the file chunk to the aspx page,
var sendFile = function (blockLength) {
var start = 0,
end = Math.min(blockLength, uploader.file.size),
incrimentalIdentifier = 1,
retryCount = 0,
sendNextChunk, fileChunk;
uploader.displayStatusMessage();
sendNextChunk = function () {
fileChunk = new FormData();
uploader.renderProgress(incrimentalIdentifier);
if (uploader.file.slice) {
fileChunk.append('Slice', uploader.file.slice(start, end));
}
else if (uploader.file.webkitSlice) {
fileChunk.append('Slice', uploader.file.webkitSlice(start, end));
}
else if (uploader.file.mozSlice) {
fileChunk.append('Slice', uploader.file.mozSlice(start, end));
}
else {
uploader.displayLabel(operationType.UNSUPPORTED_BROWSER);
return;
}
var testcode = 'http://localhost:56307/handler1.ashx?create=0&blockid=' + incrimentalIdentifier + '&filename=' + uploader.file.name + '&totalBlocks=' + uploader.totalBlocks;
jqxhr = $.ajax({
async: true,
url: testcode,
data: fileChunk,
contentType: false,
processData:false,
dataType: 'text json',
type: 'POST',
error: function (request, error) {
if (error !== 'abort' && retryCount < maxRetries) {
++retryCount;
setTimeout(sendNextChunk, retryAfterSeconds * 1000);
}
if (error === 'abort') {
uploader.displayLabel(operationType.CANCELLED);
uploader.resetControls();
uploader = null;
}
else {
if (retryCount === maxRetries) {
uploader.uploadError(request.responseText);
uploader.resetControls();
uploader = null;
}
else {
uploader.displayLabel(operationType.RESUME_UPLOAD);
}
}
return;
},
success: function (notice) {
if (notice.error || notice.isLastBlock) {
uploader.renderProgress(uploader.totalBlocks + 1);
uploader.displayStatusMessage(notice.message);
uploader.resetControls();
uploader = null;
return;
}
++incrimentalIdentifier;
start = (incrimentalIdentifier - 1) * blockLength;
end = Math.min(incrimentalIdentifier * blockLength, uploader.file.size);
retryCount = 0;
sendNextChunk();
}
});
};
Thanks so much for anything that can help me out.

Answer 1

is it ASPX on purpose? in http://localhost:56307/handler1.ashx?create=0&blockid?

Answer 2

Turns out on my webform, the input file tag was missing the enctype="multipart/form-data" attribute.