WORKING WITH THE CAMERA AND PHOTOS in Microsoft Word

Create QR Code ISO/IEC18004 in Microsoft Word WORKING WITH THE CAMERA AND PHOTOS

CHAPTER 16 WORKING WITH THE CAMERA AND PHOTOS
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Dispatcher.BeginInvoke(() => txtStatus.Text = ex.Message); } 3. Deploy the application to the phone.
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Now you re ready to test your implementation so far. Just as you did for your Extras integration, from the phone s Start screen, select the Pictures hub on your phone, pick any picture collection, and select an individual picture of your choice. Click the ellipsis ( ) at the bottom of the screen, and select Share. You should see Upload to PhotoCapture as one of the options that come up. Clicking that option should start the application and load the selected photo into the Image control the behavior we expect. Now you re ready to upload the photos to TwitPic, which is the primary hosting service for photos destined for Twitter, the hottest social media network today. Silverlight in general and Silverlight on Windows Phone 7 in particular differ from other applications in the fact that they rigorously enforce a non-blocking user interface principle: everything, including communications over the network, must happen asynchronously. TwitPic cloud service provides a RESTful API that allows programmers to send messages to that service as long as we conform to the expected message format.
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Adding an Upload Button to the UI
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On the user interface front, you will need to add an additional button that will trigger the upload of the photo to TwitPic. Figure 16 3 illustrates one possible placement of this button. Name the button btnUpload, and set its caption to TwitPic.
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Writing Code to Transfer an Image to TwitPic
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Because network access on Windows Phone 7 must be performed asynchronously, it takes quite a bit of code to properly construct the RESTful web service request. Most of the code, however, is repetitive, and all of the major points are summarized in these step-by-step instructions. 1. 2. Right-click the project name in Solution Explorer, select Add Reference, and then select System.Xml.Linq. Add the following using statements to the top of the page:
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using System.IO; using System.Text; using System.Xml.Linq; 3. Open MainPage.xaml.cs and paste the UploadPhoto function written here. This will be the only function that will be invoked when the photo upload needs to take place. This function sets the URL and the type of the request, and then it invokes the asynchronous BeginGetRequestStream, which packages the photo and the user credentials.
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public void UploadPhoto() { HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://twitpic.com/api/upload"); request.ContentType = "application/x-www-form-urlencoded"; request.Method = "POST"; request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), request); }
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CHAPTER 16 WORKING WITH THE CAMERA AND PHOTOS
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Figure 16 3. User interface for uploading photos to TwitPic 4. Add the following code to define the asynchronous function GetRequestStreamCallback that does all of the packaging of proper parameters; note that the exact form of the message was dictated by TwitPic, and this method simply conforms to it.
Note The TwitPic API is sensitive to even slightly malformed messages; be sure you copy/paste this method from the source code that comes with this book instead of manually retyping it and risking making a mistake.
private void GetRequestStreamCallback(IAsyncResult asynchronousResult) { try { HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState; string encoding = "iso-8859-1"; // End the operation
CHAPTER 16 WORKING WITH THE CAMERA AND PHOTOS
Stream postStream = request.EndGetRequestStream(asynchronousResult); string boundary = Guid.NewGuid().ToString(); request.ContentType = string.Format("multipart/form-data; boundary={0}", boundary); string header = string.Format("--{0}", boundary); string footer = string.Format("--{0}--", boundary); StringBuilder contents = new StringBuilder(); contents.AppendLine(header); string fileHeader = String.Format("Content-Disposition: file; name=\"{0}\"; filename=\"{1}\"; ", "media", "testpic.jpg"); string fileData = Encoding.GetEncoding(encoding).GetString(imageBits, 0, imageBits.Length); contents.AppendLine(fileHeader); contents.AppendLine(String.Format("Content-Type: {0};", "image/jpeg")); contents.AppendLine(); contents.AppendLine(fileData); contents.AppendLine(header); contents.AppendLine(String.Format("Content-Disposition: form-data; name=\"{0}\"", "username")); contents.AppendLine(); contents.AppendLine("BeginningWP7"); contents.AppendLine(header); contents.AppendLine(String.Format("Content-Disposition: form-data; name=\"{0}\"", "password")); contents.AppendLine(); contents.AppendLine("windowsphone7"); contents.AppendLine(footer); // Convert the string into a byte array. byte[] byteArray = Encoding.GetEncoding(encoding).GetBytes(contents.ToString()); // Write to the request stream. postStream.Write(byteArray, 0, contents.ToString().Length); postStream.Close(); // Start the asynchronous operation to get the response request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request); } catch (Exception ex) { Dispatcher.BeginInvoke(() => txtStatus.Text = ex.Message); } } 5. Add the GetResponseCallback function that will asynchronously receive the results of the upload (Success or Fail) and parse that result out using LINQ to XML.
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