CODEWITHSUNDEEP
c#phpxamarin.ioswebclient
BruceHill
BruceHill

Reputation: 7164

WebClient UploadFile corrupts binary data

I am trying to synchronize binary files (photos) from my Monotouch application, running on an iPad, to our PHP server (Windows) using Webclient. The files are being sent and received, but the binary files seem to be corrupt on the server and cannot be viewed.

Here is the client side code:

static void UploadPhotos()
{
    WebClient client = new WebClient ();
    client.Headers.Add("Content-Type","application/octet-stream");
    string sUri = GetUri();
    client.UploadFile (sUri, "POST", "images/test.png");
}

And here is the PHP code on the server:

<?php
$uploadDir = "C:\\uploaddir\\";
foreach ($_FILES as $file_name => $file_array) {
    $uploadFile = $uploadDir . $file_array['name'];
    move_uploaded_file($file_array['tmp_name'], $uploadFile);
}
?>

Does anyone know why the binary data gets corrupted in the upload and how to fix it?

Update:

Very strange indeed. It seems the problem I am having affects png images only; jpeg images seem to come across correctly. The jpeg images show the image dimensions correctly in windows explorer on the server and I am able to preview the jpeg images. The jpeg images that I tested were about 90 KB. The png files though are not coming across correctly. In windows explorer the png files don't show the dimensions of the images and cannot be previewed. The png file sizes are larger on the server. So, for example, I use the following png image:

http://tuxpaint.org/stamps/stamps/animals/birds/cartoon/tux.png

The initial file is 40.2 KB (41236 bytes); after transfer the file size on the server is 45.3 KB (46468 bytes). Anyone got any ideas how this could happen?

Upvotes: 1

Views: 2387

Answers (2)

Andrew Gale
Andrew Gale

Reputation: 107

I had to use UploadDataAsync

 using (WebClient client = new WebClient())
        {
           client.Credentials = CredentialCache.DefaultCredentials; 
           byte[] bytes = File.ReadAllBytes(filePath);
           client.UploadDataAsync(new Uri(url), bytes);
        }

Upvotes: 0

Mike Payne
Mike Payne

Reputation: 624

Try setting the Content-Type to "application/octet-stream", I think that's more common for binary data and the server may not recognize binary/octet-stream.

Upvotes: 2

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