[Wordpress XML-RPC] Uploading an image to Wordpress

Hi everybody,

I'm using the XML-RPC.net framework to upload an image to Wordpress through Wordpress' metaWeblog.newMediaObject.

However, I'm stuck and keep running into the following error:

CookComputing.XmlRpc.XmlRpcTypeMismatchException: response
contains struct value where string expected (as type String)

As the error suggests, something is wrong with my struct. But I can't find it. Do you have an suggestion?

This is my code:

        [XmlRpcMissingMapping(MappingAction.Ignore)]
        public struct Image
        {
            public string name;
            public string type;
            public string bits;
            public bool overwrite;
            public int gallery;
            public int image_d;
        }

        // Upload image
        public void UploadImage(string imageURL)
        {
            this.Url = wordpressXmlrpcUrl;

            Image theImage     = new Image();
            theImage.name      = "myNewImage.png";
            theImage.bits      = Base64Image(imageURL);
            theImage.overwrite = false;
            theImage.type      = "image/png";            

            try
            {
                newImage("blogid", username, password, theImage, false);
                Console.WriteLine("Image successfully uploaded!");
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error: ", ex.ToString());
                throw;
            }
        }

        [XmlRpcMethod("metaWeblog.newMediaObject")]
        public string newImage(string blogid, string username, string password, Image theImage, bool overwrite)
        {
            return (string)this.Invoke("newImage", new object[] { blogid, username, password, theImage, overwrite });
        }

PS:

• Posting a blog post with just text to Wordpress works (so url, password, login are correct).
• The method (Base64Image) that returns a Base64 string of the image works correctly. I've verified that by using an online Base64 decoder with the output of that method.

So, as I understand it, the problem lays not in what is send to Wordpress, buthow it's send.

Thanks in advance for any suggestion!