How to delete file opened by a Canvas

Lahiru Mahagamage

hello guys,

I'm opening a .bmp image created on a folder on a InkCanvas to draw on like below. And when i'm closing it i want the TempFile to be deleted. but when i try to delete it says the file is used by another process. is there anyway to do this? I'm using WPF C#. Please help me out.

Thanks you! :)

img = new BitmapImage(new Uri(TempFile, UriKind.Relative));
myImageBrush = new ImageBrush(img);
myCanvas = new Canvas();
myCanvas.Width = img.Width;
myCanvas.Height = img.Height;
myCanvas.Background = myImageBrush;
cw.ImgPO.Height = img.Height;
cw.ImgPO.Children.Add(myCanvas);

6 Replies

Know the answer? Post it — somebody with the same question will find it here.

Amit Gupta8y ago
Accepted answer
I think you have done just a copypaste, understand the code before implementing it.

The final code of yours is here
//img = new BitmapImage(new Uri(TempFile, UriKind.Relative));

img = GetBitmap(new Uri(TempFile));

myImageBrush = new ImageBrush(img);
myCanvas = new Canvas();
myCanvas.Width = img.Width;
myCanvas.Height = img.Height;
myCanvas.Background = myImageBrush;

cw.ImgPO.Height = img.Height;
cw.ImgPO.Children.Add(myCanvas);

public BitmapImage GetBitmap(Uri src)
{
  var bmp = new BitmapImage();
  var stream = File.OpenRead(src.AbsolutePath);
  bmp.BeginInit();
  bmp.CacheOption = BitmapCacheOption.OnLoad();
  bmp.StreamSource = stream;
  bmp.EndInit();
  stream.Close();
  stream.Dispose();
  return bmp;
}
Do let me know if it works.
0
Lahiru Mahagamage8y ago
small changes were made on the below code given by @Amit Gupta
img = GetBitmap(TempFile);

myImageBrush = new ImageBrush(img);
myCanvas = new Canvas();
myCanvas.Width = img.Width;
myCanvas.Height = img.Height;
myCanvas.Background = myImageBrush;

cw.ImgPO.Height = img.Height;
cw.ImgPO.Children.Add(myCanvas);

public BitmapImage GetBitmap(string src)
{
  var bmp = new BitmapImage();
  var stream = File.OpenRead(src);
  bmp.BeginInit();
  bmp.CacheOption = BitmapCacheOption.OnLoad;
  bmp.StreamSource = stream;
  bmp.EndInit();
  stream.Close();
  stream.Dispose();
  return bmp;
}
0
Lahiru Mahagamage8y ago
@Amit Gupta

I did that and how can i get the height of the Canvas. When did the above code i could call the height from canvas.height but now the height wont wont come when i use this code with the above and still the using error occurs :(
BitmapImage BitmapToImageSource(Bitmap bitmap)
{
    using (MemoryStream memory = new MemoryStream())
    {
        bitmap.Save(memory, System.Drawing.Imaging.ImageFormat.Bmp);
        memory.Position = 0;
        BitmapImage bitmapimage = new BitmapImage();
        bitmapimage.BeginInit();
        bitmapimage.StreamSource = memory;
        bitmapimage.CacheOption = BitmapCacheOption.OnLoad;
        bitmapimage.EndInit();

        return bitmapimage;
    }
}

img = new Bitmap(TempFile);

            myImageBrush = new ImageBrush(BitmapToImageSource(img));

            myCanvas = new Canvas();
            myCanvas.Width = img.Width;
            myCanvas.Height = img.Height;
            myCanvas.Background = myImageBrush;

            cw.ImgDel.Height = img.Height;
            cw.ImgDel.Children.Add(myCanvas);
0
Amit Gupta8y ago
Hey

Instead of loading and working directly with images, load it in a cache memory and then play with your stuffs.

Look at the reference
https://stackoverflow.com/questions/22499407/how-to-display-a-bitmap-in-a-wpf-image
+1
Lahiru Mahagamage8y ago
did that but that didn't work
0
Laxmidhar Sahoo8y ago
sir Do you mean

canvas.Children.Clear();
0

How to delete file opened by a Canvas

@Amit Gupta