CODEWITHSUNDEEP
c#gdi+
jera
jera

Reputation: 322

External Exception was unhandled. A generic error occurred in GDI+. only on second call

I created a WPF project which has a settings window as main window and from there I open a game window. When opening the game window, the following code creates one long image strip out of several images.

var target = new System.Drawing.Bitmap((int)width, (int)height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
var graphics = System.Drawing.Graphics.FromImage(target);
graphics.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceOver;

int i = 0;
foreach (Image img in images)
{
     System.Drawing.Image drawingImg = ConvertWpfImageToImage(img);
     System.Drawing.Bitmap source = new System.Drawing.Bitmap(drawingImg);
     graphics.DrawImage(source, i, 0);
     i += 320;
}
target.Save(@".\resources\images\conveyerBeltSymbols\bigPicture.png");

This seems to be no problem (although I am saving a bitmap image as png, I know that) at the first time but when I close the second window and try to open it again (without closing the first window too) I get External Exception was unhandled. A generic error occurred in GDI+.

I tried adding Dispose() to both graphics and target and also tried to add ImageFormat.Png to the target.Save method but nothing worked for me.

Has anyone got a solution?

Upvotes: 2

Views: 1759

Answers (2)

Richard Deeming
Richard Deeming

Reputation: 31228

Loading the picture using the new BitmapImage(Uri) constructor will keep the file locked. Try using:

var image = new BitmapImage();
image.BeginInit();
image.CacheOption = BitmapCacheOption.OnLoad;
image.UriSource = new Uri(@".\resources\images\conveyerBeltSymbols\bigPicture.png", UriKind.Relative);
image.EndInit();

slider.ImageSource = image;

Upvotes: 2

Haney
Haney

Reputation: 34832

Ensure that you are properly using or calling Dispose() on each of the GDI objects... Including your Bitmap and Image. This should resolve your issues. It's likely you're not releasing unmanaged resources properly.

Upvotes: 0

Related Questions