Uploading ImageFile on Remote Server with Windows Phone7 




Helper class file


using System;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Ink;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using System.IO;

using System.Windows.Threading;

using System.Collections.Generic;

namespace FileUploadExample

{

    public class SendFile

    {

public string url { get; set; }

public string fileName = null;

public Dictionary<string, object> parameters { get; set; }

string boundary = "----------" + DateTime.Now.Ticks.ToString();

public SendFile() { }

public void Submit()

{

   // Prepare web request...

   HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(new Uri(url));

   myRequest.Method = "POST";

   myRequest.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);

   myRequest.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), myRequest);

}

private void GetRequestStreamCallback(IAsyncResult asynchronousResult)

{

   HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;

   Stream postStream = request.EndGetRequestStream(asynchronousResult);

   writeMultipartObject(postStream, parameters);

   postStream.Close();

   request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);

}

private void GetResponseCallback(IAsyncResult asynchronousResult)

{

   try

   {

var request = (HttpWebRequest)asynchronousResult.AsyncState;

var response = request.EndGetResponse(asynchronousResult);

using (var stream = response.GetResponseStream())

using (var reader = new StreamReader(stream))

{

   // FAIL - httpWebRequestTextBlock.Text = reader.ReadToEnd(); //UnauthorizedAccessException was Unhandled - Invalid cross-thread access.

   // FAIL - Dispatcher.BeginInvoke(() => { httpWebRequestTextBlock.Text = reader.ReadToEnd(); }); //ObjectDisposedException unhandled - Cannot read from a closed TextReader.

   var contents = reader.ReadToEnd();

   Deployment.Current.Dispatcher.BeginInvoke(() => { MessageBox.Show(contents); });

}

   }

   catch (System.Net.WebException)

   {

Deployment.Current.Dispatcher.BeginInvoke(() => { MessageBox.Show("Time out Occur. Please try again"); });

   }

}

public void writeMultipartObject(Stream stream, object data)

{

   StreamWriter writer = new StreamWriter(stream);

   if (data != null)

   {

foreach (var entry in data as Dictionary<string, object>)

{

   WriteEntry(writer, entry.Key, entry.Value);

}

   }

   writer.Write("--");

   writer.Write(boundary);

   writer.WriteLine("--");

   writer.Flush();

}

private void WriteEntry(StreamWriter writer, string key, object value)

{

   if (value != null)

   {

writer.Write("--");

writer.WriteLine(boundary);

if (value is byte[])

{

   byte[] ba = value as byte[];

writer.WriteLine(@"Content-Disposition: form-data; name=""{0}""; filename=""{1}""", key, fileName);

   writer.WriteLine(@"Content-Type: application/octet-stream");

   //writer.WriteLine(@"Content-Type: image / jpeg");

   writer.WriteLine(@"Content-Length: " + ba.Length);

   writer.WriteLine();

   writer.Flush();

   Stream output = writer.BaseStream;

   output.Write(ba, 0, ba.Length);

   output.Flush();

   writer.WriteLine();

}

else

{

   writer.WriteLine(@"Content-Disposition: form-data; name=""{0}""", key);

   writer.WriteLine();

   writer.WriteLine(value.ToString());

}

   }

}

    }

}

Code behind Logic

private void cmdGetImage_Click(object sender, RoutedEventArgs e)

{

   photo.ShowCamera = true;

   photo.Show();

   photo.Completed += new EventHandler<PhotoResult>(photo_Completed);

}

void photo_Completed(object sender, PhotoResult e)

{

    if (e.TaskResult == TaskResult.OK)

    {

byte[] byteArray = Setting.ReadToEnd(e.ChosenPhoto);

string filename = "file:" + e.OriginalFileName;

SendMessage(txtUsername.Text , txtMessage.Text, DateTime.Now.ToString(), "Text", byteArray , filename);    

    }

else

MessageBox.Show("not found");

}

// Method to convert Stream in to byte[] Array

public static byte[] ReadToEnd(System.IO.Stream stream)

{

   long originalPosition = 0;

   if (stream.CanSeek)

   {

originalPosition = stream.Position;

stream.Position = 0;

   }

   try

   {

byte[] readBuffer = new byte[4096];

int totalBytesRead = 0;

int bytesRead;

while ((bytesRead = stream.Read(readBuffer, totalBytesRead, readBuffer.Length - totalBytesRead)) > 0)

{

   totalBytesRead += bytesRead;

   if (totalBytesRead == readBuffer.Length)

   {

int nextByte = stream.ReadByte();

if (nextByte != -1)

{

   byte[] temp = new byte[readBuffer.Length * 2];

   Buffer.BlockCopy(readBuffer, 0, temp, 0, readBuffer.Length);

   Buffer.SetByte(temp, totalBytesRead, (byte)nextByte);

   readBuffer = temp;

   totalBytesRead++;

}

   }

}

private void SendMessage(string  _username , string _message, string _date, string _mode, byte[] fileArray ,  string filename)

{

Dictionary<string, object> data = new Dictionary<string, object>()

{

    {"username", _username},

    {"message", _message},

    {"date", _date},

    {"mode",_mode},

    {"file", fileArray}

};

string serverFileName = "image_" + DateTime.Now.ToFileTime() + filename.Substring(filename.LastIndexOf('.'), filename.Length - filename.LastIndexOf('.'));

// Call the constructor of above Helper file

SendFile post = new SendFile 

{ 

url = "Enter your webservice Url", 

parameters = data,  

fileName = serverFileName 

};

 // Calling the post method of Helper file

post.Submit();

}

Happy Coding...