Comments on: File Upload in Silverlight – a Simple Solution

By: hjp

hjp — Sun, 15 Jan 2012 03:37:58 +0000

Hi, Sorry for the previous post, I am using vb.net and I had to make the following change to make it work correctly
_bytesUploaded += (fileContent.Length – 1)
instead of
_bytesUploaded += fileContent.Length
Thanks anyway for the simple coding I am using your cause its pretty simple for my small application.

By: hjp

hjp — Sun, 15 Jan 2012 03:06:36 +0000

Hi, I downloaded your new version and still get corrupted file for xlsx and so I tried 300kb text file and found out the text written in it is not in sequence so if we make 4 round trip to server the 3 write event is writing it data even before 2 write event and I am sure that can mess up any xlsx or other file. Please let me know. Thanks in advance

By: isambert

isambert — Fri, 06 Jan 2012 18:23:49 +0000

you can use also the Session to save partial byte[] and then create the file only in the last byte upload

By: Joe

Joe — Tue, 03 Jan 2012 19:40:49 +0000

Nevermind, I have found a solution. I have added the following code. AFTER it writes to the outputstream you must call writestreamclosed event:

private void wc_WriteStreamClosed(object sender, WriteStreamClosedEventArgs e)
{
if (e.Error == null)
{
if (_imgbytesUploaded < _imgbytesTotal)
{
string CurrentTime = GetTimestamp(DateTime.Now.ToUniversalTime());
UploadFile(_imgName, CurrentTime, _imgdata);
}
else
{
currentlyuploading = false;
string CurrentTime = GetTimestamp(DateTime.Now.ToUniversalTime());
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.gintechsystems.com/uploadwpmobilephotocomplete.php?imgName=" + _imgName + "&imgSize=" + _imgbytesTotal + "&gid=" + gintechuser.UserID + "&t=" + CurrentTime);
request.Method = "GET";
request.BeginGetResponse(new AsyncCallback(GetResponseUserCallback), request);
}
}
}

I also enabled the following (not sure if it helps though lol)

wc.AllowReadStreamBuffering = true;
wc.AllowWriteStreamBuffering = true;

Hope this helps somehow.

By: Joe

Joe — Tue, 03 Jan 2012 19:29:19 +0000

So how would you go about putting it in order? This method does work very well and my php code works perfect just out of order, maybe some packet loss but that can be easily fixed zipping the file when sending the bytes then unzipping on the server. Any examples how how to put this in order using a simple mechanism?

By: John

John — Tue, 27 Dec 2011 17:33:38 +0000

@Martin — Well, yes, you have identified a flaw, and there is no reason to believe this design would work as it stands…. There has to be added to it a mechanism to ensure the packets are reassembled in correct order…kind of like is done in TCP.

By: Free Download Software, Games, Movie, eBook, Music, TV-Shows, GFX

Free Download Software, Games, Movie, eBook, Music, TV-Shows, GFX — Tue, 20 Dec 2011 14:22:11 +0000

Free Download Software, Games, Movie, eBook, Music, TV-Shows, GFX…

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By: Martin

Martin — Fri, 16 Dec 2011 15:42:10 +0000

Follow up, using hexedit I noticed that the chunks are being saved out of order.

By: Martin

Martin — Fri, 16 Dec 2011 14:10:46 +0000

Hi,

Any idea why this upload method corrupts .xslx files?

By: Welcome to GFXshare.us - Free GFX source for you

Welcome to GFXshare.us - Free GFX source for you — Tue, 06 Dec 2011 10:15:26 +0000

Welcome to GFXshare.us – Free GFX source for you…

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