ImageShack.us image upload (C# code)

Spent a couple hours yesterday looking for some code to upload images to ImageShack.us (I need it for a XBMC for Xbox remote control app I’m writting) and thought I might share the code.

The image I have is already available in a PictureBox and this only concentrates on the upload itself, won’t go into parsing the XML reply, that should be fairly easy to implement it yourself…

More information about the ImageShack.us Upload API and how to apply for a key here:
http://code.google.com/p/imageshackapi/wiki/ImageshackAPI

Working example here:
https://code.google.com/p/dandar3-apps/source/browse/#svn/trunk/ImageShack Upload

/**
 * ImageShack Unified upload API
 * http://code.google.com/p/imageshackapi/wiki/ImageshackAPI
 */
private void buttonUpload_Click(object sender, EventArgs e)
{
  //
  Cursor.Current = Cursors.WaitCursor;

  //
  // Init
  //
  String      filename    = "fake_name";
  String      mimeType    = "image/jpeg";
  ImageFormat imageFormat = System.Drawing.Imaging.ImageFormat.Jpeg;

  //
  // Prepare POST contents...
  //
  MemoryStream memoryStream = new MemoryStream();

  // Parts boundary
  String boundary = "-------" + DateTime.Now.Ticks.ToString("x");
  String crlf     = "\r\n";
  
  // Image file...
  write(memoryStream, "--" + boundary + crlf);
  write(memoryStream, String.Format("Content-Disposition: form-data; name=\"fileupload\"; filename=\"{0}\"", filename) + crlf);
  write(memoryStream, String.Format("Content-Type: {0}", mimeType) + crlf);
  write(memoryStream, crlf);
  
  pictureBox.Image.Save(memoryStream, imageFormat);
  write(memoryStream, crlf);
  
  // Other parameters (Key, Username, Password etc)
  NameValueCollection parameters = new NameValueCollection();
  parameters.Add("key",        "your_key");
  parameters.Add("a_username", "your_username");
  parameters.Add("a_password", "your_password");
  parameters.Add("tags",       "your_tags");

  foreach (String param_name in parameters.Keys)
  {
    write(memoryStream, "--" + boundary + crlf);
    write(memoryStream, String.Format("Content-Disposition: form-data; name=\"{0}\"", param_name) + crlf);
    write(memoryStream, crlf);
    write(memoryStream, parameters.Get(param_name));
    write(memoryStream, crlf);
  }

  // End...
  write(memoryStream, "--" + boundary + crlf);
  
  //
  // Upload (POST)...
  //
  try
  {
    HttpWebRequest webRequest = (HttpWebRequest) HttpWebRequest.Create("http://www.imageshack.us/upload_api.php");
    webRequest.ContentType    = "multipart/form-data; boundary=" + boundary;
    webRequest.Method         = "POST";

    //
    // Request
    //
    webRequest.ContentLength = memoryStream.Length;
    using (Stream requestStream = webRequest.GetRequestStream())
    {
      memoryStream.Seek(0, SeekOrigin.Begin);
      memoryStream.WriteTo(requestStream);
    }

    //
    // Response
    //
    using (WebResponse  webResponse  = webRequest.GetResponse())
    using (StreamReader streamReader = new StreamReader(webResponse.GetResponseStream()))
    {
      String imageshackReply = streamReader.ReadToEnd().Trim();
      MessageBox.Show(imageshackReply, "HTTP POST Response", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }
  }
  catch (Exception ex)
  {
    MessageBox.Show(ex.Message, "HTTP POST Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
  }

  //
  // Clean-up...
  //
  memoryStream.Close();
}

/**
 * 
 */
private void write(MemoryStream p_memoryStream, String p_data)
{
  byte[] bytes = Encoding.ASCII.GetBytes(p_data);
  p_memoryStream.Write(bytes, 0, bytes.Length);
}