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POSilverlight Http Post to upload images
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copied!<p>I have been trying to perform an HTTP Post request to upload an image in a silverlight application for a windows phone 7 application. The sample codes online do not get me the desired response from the API. Could anyone please provide a working code which does this?</p> <p>By desired response I mean that the API responds saying that the uploaded file is in a format which cannot be read.</p> <p>Thanks in advance!</p> <p>Here is my code:</p> <pre><code> private void post_image(version, username,password,job-id, serviceUri) { if (session_free.bLoggedIn) { bool submit_success = false; HttpWebRequest request = (HttpWebRequest)WebRequest.Create(new Uri(serviceUri)); IsolatedStorageFileStream stream = IsolatedStorageFile.GetUserStoreForApplication().OpenFile("file.jpg", FileMode.Open); request.PostMultiPartAsync(new Dictionary<string, object> { { "version", version }, { "username", user }, { "password", pass }, { filename, stream } }, new AsyncCallback(asyncResult => { Thread.Sleep(1000); HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asyncResult); Stream responseStream = response.GetResponseStream(); StreamReader reader = new StreamReader(responseStream); Post_Result = reader.ReadToEnd(); this.Dispatcher.BeginInvoke(delegate { MessageBox.Show(Post_Result); response.Close(); }); }), filename); Thread.Sleep(1000); } else { MessageBox.Show("User not signed in! Please login to continue...", "Invalid Authentication", MessageBoxButton.OK); } } public class DataContractMultiPartSerializer { private string boundary; public DataContractMultiPartSerializer(string boundary) { this.boundary = boundary; } private void WriteEntry(StreamWriter writer, string key, object value, string filename) { if (value != null) { writer.Write("--"); writer.WriteLine(boundary); if (value is IsolatedStorageFileStream) { IsolatedStorageFileStream f = value as IsolatedStorageFileStream; writer.WriteLine(@"Content-Disposition: form-data; name=""{0}""; filename=""{1}""", key, filename); writer.WriteLine("Content-Type: image/jpeg"); writer.WriteLine("Content-Length: " + f.Length); writer.WriteLine(); writer.Flush(); Stream output = writer.BaseStream; Stream input = f; byte[] buffer = new byte[4096]; for (int size = input.Read(buffer, 0, buffer.Length); size > 0; size = input.Read(buffer, 0, buffer.Length)) { output.Write(buffer, 0, size); } output.Flush(); writer.WriteLine(); } else { writer.WriteLine(@"Content-Disposition: form-data; name=""{0}""", key); writer.WriteLine(); writer.WriteLine(value.ToString()); } } } public void WriteObject(Stream stream, object data, string filename) { StreamWriter writer = new StreamWriter(stream); if (data != null) { if (data is Dictionary<string, object>) { foreach (var entry in data as Dictionary<string, object>) { WriteEntry(writer, entry.Key, entry.Value, filename); } } else { foreach (var prop in data.GetType().GetFields()) { foreach (var attribute in prop.GetCustomAttributes(true)) { if (attribute is System.Runtime.Serialization.DataMemberAttribute) { DataMemberAttribute member = attribute as DataMemberAttribute; writer.Write("{0}={1}&", member.Name ?? prop.Name, prop.GetValue(data)); } } } } writer.Flush(); } } } </code></pre>

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