CODEWITHSUNDEEP
c#wpfprocess
jjo
jjo

Reputation: 154

Delete File Used By Other Process

I am trying to create a C# app which loads a powerpoint and makes each slide a JPG that is stored in a list of BitmapImages. The user should be able to load another powerpoint, which, on load, deletes each of the other JPGs in the folder. Currently, I am unable to delete the JPGs, as they are "being used by another process" which happens to be this app. How can I work around this?

foreach (ISlide slide in presentation.Slides)
{
             System.IO.Stream imageStream = slide.ConvertToImage(Syncfusion.Drawing.ImageFormat.Jpeg);
             System.Drawing.Image convertedImage = System.Drawing.Image.FromStream(imageStream);

             if (!System.IO.File.Exists(picsPath + "\\Slide_" + slide.SlideNumber + ".jpg"))
                  convertedImage.Save(picsPath + "\\Slide_" + slide.SlideNumber + ".jpg");
             else
             {
                        try
                        {
                  System.IO.File.Delete(picsPath + "\\Slide_" + slide.SlideNumber + ".jpg");               
                  convertedImage.Save(picsPath + "\\Slide_" + slide.SlideNumber + ".jpg");
             }
                  catch (Exception df){Console.WriteLine(df.StackTrace);}
             }
             bitmap = new BitmapImage();
             bitmap.BeginInit();
             bitmap.UriSource = new Uri(picsPath + "\\Slide_" + slide.SlideNumber + ".jpg");
             bitmap.CacheOption = BitmapCacheOption.OnLoad;
             bitmap.EndInit();
             VisualAidPPT.Add(bitmap);
             convertedImage = null;
}

Upvotes: 0

Views: 64

Answers (1)

Clemens
Clemens

Reputation: 128042

You don't need to write any image file at all.

Just directly use the Stream returned by slide.ConvertToImage to load a BitmapImage:

foreach (var slide in presentation.Slides)
{
    var bitmap = new BitmapImage();

    using (var imageStream = slide.ConvertToImage(Syncfusion.Drawing.ImageFormat.Jpeg))
    {
        imageStream.Position = 0;

        bitmap.BeginInit();
        bitmap.StreamSource = imageStream;
        bitmap.CacheOption = BitmapCacheOption.OnLoad;
        bitmap.EndInit();
    }

    VisualAidPPT.Add(bitmap);
}

EDIT: In case the above does not work, you may still decode a System.Drawing.Image and save that to a MemoryStream:

foreach (var slide in presentation.Slides)
{
    var bitmap = new BitmapImage();

    using (var imageStream = slide.ConvertToImage(Syncfusion.Drawing.ImageFormat.Jpeg))
    using (var image = System.Drawing.Image.FromStream(imageStream))
    using (var memoryStream = new MemoryStream())
    {
        image.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Jpeg);
        memoryStream.Position = 0;

        bitmap.BeginInit();
        bitmap.StreamSource = memoryStream;
        bitmap.CacheOption = BitmapCacheOption.OnLoad;
        bitmap.EndInit();
    }

    VisualAidPPT.Add(bitmap);
}

Upvotes: 1

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