Problem loading WCF RESTful service images

Question

1 namespace Uploader 2 { 3 using System; 4 using System.IO; 5 using System.ServiceModel; 6 using System.ServiceModel.Description; 7 using System.ServiceModel.Web; 8 using System.Drawing; 9 using System.Drawing.Imaging; 10 using System.Net; 11 using System.Xml; 12 13 [ServiceContract(Namespace = "http://Uploader")] 14 public interface IUploaderService 15 { 16 [OperationContract, WebInvoke(Method = "POST",UriTemplate = "File/{fileName}")] 17 bool UploadFile(string fileName, Stream fileContents); 18 } 19 20 [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)] 21 public class UploaderService : IUploaderService 22 { 23 public bool UploadFile(string fileName, Stream fileContents) 24 { 25 return true; 26 } 27 } 28 29 class Program 30 { 31 static void Main() 32 { 33 var host = new 34 ServiceHost(typeof (UploaderService), 35 new Uri("http://localhost:8080/Uploader")); 36 host.AddServiceEndpoint("Uploader.IUploaderService", 37 new WebHttpBinding(), "").Behaviors.Add(new WebHttpBehavior()); 38 try 39 { 40 host.Open(); 41 Console.WriteLine(host.BaseAddresses[0].AbsoluteUri + " running."); 42 Console.WriteLine(); 43 var uri = "http://localhost:8080/Uploader/file.jpg"; 44 var req = WebRequest.Create(uri) as HttpWebRequest; 45 if (req != null) 46 { 47 req.Method = "POST"; 48 req.ContentType = "image/jpeg"; 49 var reqStream = req.GetRequestStream(); 50 51 var imageStream = new MemoryStream(); 52 using (var i = Image.FromFile(@"c:\photo.jpg")) 53 i.Save(imageStream, ImageFormat.Jpeg); 54 55 var imageArray = imageStream.ToArray(); 56 reqStream.Write(imageArray, 0, imageArray.Length); 57 reqStream.Close(); 58 var resp = (HttpWebResponse)req.GetResponse(); 59 var r = new XmlTextReader(resp.GetResponseStream()); 60 if (r.Read()) 61 { 62 Console.WriteLine(r.ReadString()); 63 } 64 } 65 Console.WriteLine("Press <ENTER> to quit."); 66 Console.ReadLine(); 67 } 68 catch (Exception ex) 69 { 70 Console.WriteLine(ex.Message); 71 Console.ReadKey(); 72 } 73 finally 74 { 75 if (host.State == CommunicationState.Faulted) 76 host.Abort(); 77 else 78 host.Close(); 79 } 80 } 81 } 82 } 83 84 

Hi, I hope you can help ....

I am creating a simple application (possibly a web page) that will have a simple interface and will download files from an external device, the application / web page will be launched through autorun.inf when the user connects the device to the PC. Webservice will do the hard work of linking the file to the management system, etc. This will allow illiterate IT users who cannot use file verification to send files to the management system ...!

The problem is that my RESTful serivce gives me a 400 error when the content type is the image / jpeg .. It works fine for text / plain or text / xml (see. Blog article).

Thanks J

Answer 1

You can try to redefine any type of content and download all files as an application / octet stream or text / simple using IOperationBehavior.

 public class WebContentTypeAttribute : Attribute, IOperationBehavior, IDispatchMessageFormatter { private IDispatchMessageFormatter innerFormatter; public string ContentTypeOverride { get; set; } public WebContentTypeAttribute(string contentTypeOverride) { this.ContentTypeOverride = contentTypeOverride; } // IOperationBehavior public void Validate(OperationDescription operationDescription) { } public void ApplyDispatchBehavior(OperationDescription operationDescription, DispatchOperation dispatchOperation) { innerFormatter = dispatchOperation.Formatter; dispatchOperation.Formatter = this; } public void ApplyClientBehavior(OperationDescription operationDescription, ClientOperation clientOperation) { } public void AddBindingParameters(OperationDescription operationDescription, BindingParameterCollection bindingParameters) { } // IDispatchMessageFormatter public void DeserializeRequest(Message message, object[] parameters) { if (message == null) return; if (string.IsNullOrEmpty(ContentTypeOverride)) return; var httpRequest = (HttpRequestMessageProperty)message.Properties[HttpRequestMessageProperty.Name]; httpRequest.Headers["Content-Type"] = ContentTypeOverride; } public Message SerializeReply(MessageVersion messageVersion, object[] parameters, object result) { return innerFormatter.SerializeReply(messageVersion, parameters, result); } } 

And you have to change your service contract to look like this

 [OperationContract] [WebInvoke(Method = "POST",UriTemplate = "File/{fileName}")] [WebContentType("application/octet-stream")] bool UploadFile(string fileName, Stream fileContents); 

Although, if you are downloading from a web page, the data will not be placed in multipart / form-data format?