Accessing saved image on a Windows Phone - windows-phone

Question

I am creating a camera app for the Windows Phone but when I want to retrieve my saved photo as a BitmapImage, nothing seems to work. I am using IsolatedStorageSettings to save the path of the images as shown below:
Picture p = mediaLibrary.SavePictureToCameraRoll(fileName, e.ImageStream);
if (!settings.Contains("lastImageTaken"))
{
//GetPath() requires using Microsoft.Xna.Framework.Media.PhoneExtensions;
settings.Add("lastImageTaken", p.GetPath());
}
else
{
settings["lastImageTaken"] = p.GetPath();
}
settings.Save();
then once the app starts up, I try to retrieve that last photo taken as shown below:
lastImageTaken = IsolatedStorageSettings.ApplicationSettings["lastImageTaken"] as string;
Uri uri = new System.Uri(lastImageTaken, UriKind.RelativeOrAbsolute);
BitmapImage image = new BitmapImage(uri);
previouseImage.Source = image;
if (image.PixelWidth < 1)
debugText.Text += " FAILED";
I have also tried something like this:
Uri uri = new System.Uri("file:///" + lastImageTaken.Replace("\\", "/"), UriKind.RelativeOrAbsolute);
BitmapImage image = new BitmapImage(uri);
but nothing seems to display the image. The width of to image always is shown as 0 which displays a "FAILED" text on a debug text. lastImageTaken is shown as C:\Data\Users\Public\Camera Roll\SMCA_jpg.jpg
I have also added the capabilities of ID_CAP_MEDIALIB_PHOTO

Answer 1

It seems that you are saving the image to CameraRoll, but trying to retrieve image from IsolatedStorage. Those are two different storage areas, and they are accessed differently.
In order to save an image to IsolatedStorage you need to replace this :
library.SavePictureToCameraRoll(fileName, e.ImageStream);
with this :
using (IsolatedStorageFile isStore = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream targetStream = isStore.OpenFile(fileName, FileMode.Create, FileAccess.Write))
{
// Initialize the buffer for 4KB disk pages.
byte[] readBuffer = new byte[4096];
int bytesRead = -1;
// Copy the image to the local folder.
while ((bytesRead = e.ImageStream.Read(readBuffer, 0, readBuffer.Length)) > 0)
{
targetStream.Write(readBuffer, 0, bytesRead);
}
}
}
Then access the image the same way you've described in your original post.
Source : http://msdn.microsoft.com/en-us/library/windows/apps/hh202956(v=vs.105).aspx#BKMK_SavingToTheMediaLibraryAndIsolatedStorage