private void Button_Click(object sender, RoutedEventArgs e) { var img = new BitmapImage(); string[] files = System.IO.Directory.GetFiles(@"d:\Images", "*.gif"); for(int i = 0; i < files.Length; i++) { } } On the hard disk I downloaded some images and saved them as .gif but I need to convert them to real gif format. In winforms I used Image.save and stream but in wpf I'm not sure how to convert the files. Not sure if this is needed at all : var img = new BitmapImage(); And I'm getting the files and loop over them but not sure how to make the conversion in the loop ?

How can I convert image file on the hard disk to gif in wpf ?

Accepted answer

Castorix31 81,446

You can do for example :

BitmapImage bi = null;
string[] files = System.IO.Directory.GetFiles(@"d:\Images", "*.gif");
for (int i = 0; i < files.Length; i++)
{
    bi = new BitmapImage();
    bi.BeginInit();
    bi.UriSource = new Uri(files[i], UriKind.RelativeOrAbsolute);
    bi.EndInit();

    GifBitmapEncoder gif = new GifBitmapEncoder();
    gif.Frames.Add(BitmapFrame.Create(bi));
    string sPath = System.IO.Path.GetDirectoryName(files[i]);
    string sFilename = System.IO.Path.GetFileNameWithoutExtension(files[i]);
    string sNewName = sPath  + @"\" + sFilename + "_new.gif";
    using (System.IO.Stream stm = System.IO.File.Create(sNewName)) 
    {
        gif.Save(stm);
    }
}

sharon glipman 441 Reputation points

2021-10-13T22:11:08.383+00:00

Working great.

What if I want to replace the new images with the old ones ? I mean same folder but each time converting one to delete one so in the end there will be only the _new gif's ?
Castorix31 81,446 Reputation points

2021-10-13T22:49:40.513+00:00
You can add at the end, in the loop :

System.IO.File.Delete(files[i]);

and by changing the part with BitmapImage with the method explained at : .NET, WPF – BitmapImage File Locking
(otherwise you cannot delete the original file because it is locked)
sharon glipman 441 Reputation points

2021-10-13T23:12:17.987+00:00

I added already at the end of the loop File.Delete but it says the file is busy.

I read now the link you provided but you already making instance each time for the bi variable.
Can you show me how to make the part with the BitmapImage ?

Castorix31 81,446

I changed in the loop :

                    //bi = new BitmapImage();
                    //bi.BeginInit();
                    //bi.UriSource = new Uri(files[i], UriKind.RelativeOrAbsolute);
                    //bi.EndInit();

                    bi = new BitmapImage();
                    var stream = System.IO.File.OpenRead(files[i]);
                    bi.BeginInit();
                    bi.CacheOption = BitmapCacheOption.OnLoad;
                    bi.StreamSource = stream;
                    bi.EndInit();
                    stream.Close();
                    stream.Dispose();

                    GifBitmapEncoder gif = new GifBitmapEncoder();
                    gif.Frames.Add(BitmapFrame.Create(bi));
                    string sPath = System.IO.Path.GetDirectoryName(files[i]);
                    string sFilename = System.IO.Path.GetFileNameWithoutExtension(files[i]);
                    string sNewName = sPath  + @"\" + sFilename + "_new.gif";
                    using (System.IO.Stream stm = System.IO.File.Create(sNewName))
                    {
                        gif.Save(stm);
                    }
                    System.IO.File.Delete(files[i]);

sharon glipman 441 Reputation points

2021-10-13T23:50:45.863+00:00
Still busy but the problem is in timer tick event. What I did and forgot about it is that once downloaded the original images I display them in Image control :

private void TimerTick(object sender, EventArgs e) { Img.Source = new BitmapImage( new Uri(@"d:\satImages\satImage" + imageIndex + ".gif")); if (++imageIndex == 10) { imageIndex = 1; } }

That is why the images I try to delete are busy.

So the solution will be first to convert the images than to display in Image the new converted images.
But this solution will be good if I download only few images. but what if I download 100 or 1000 images it will time to convert them and what will I show in the Image control in the mean time ?

So for now I will just start the timer after converting and also change the file name to _new in the timer tick.
But later I will have to think about a situation with many images downloads.

How can I convert image file on the hard disk to gif in wpf ?

0 additional answers