Possible cause for crashes missing dispose for graphic objec
Posted: Mon Jul 06, 2015 9:05 am
Looking at the code I found several code locations in Camera.cs where memory leaks may result.
Almost all graphic objects are references and contain references to unmanaged code. Therefore when you do not explicitly dispose a graphic object the garbage collector may handle the managed part but omits the unmanaged part resulting in a memory leak.
Here's an example for the safest way to handle graphic objects (found @ http://stackoverflow.com/questions/1209 ... -necessary :
or
then the objects are removed in all cases, even in case of an exception.
Due to th heavy use of the Draw... methodes the memory loss may sum up.
Almost all graphic objects are references and contain references to unmanaged code. Therefore when you do not explicitly dispose a graphic object the garbage collector may handle the managed part but omits the unmanaged part resulting in a memory leak.
Here's an example for the safest way to handle graphic objects (found @ http://stackoverflow.com/questions/1209 ... -necessary :
Code: Select all
using (Bitmap bmp = new Bitmap(100, 100))
{
using (Graphics g = Graphics.FromImage(bmp))
{
using (Pen p = new Pen(Color.FromArgb(128, Color.Blue), 1))
{
using (Brush b = new SolidBrush(Color.FromArgb(128, Color.Blue)))
{
g.FillEllipse(b, 0, 0, 99, 99);
g.FillRegion(b, pictureBox1.Region);
pictureBox1.BackColor = Color.Transparent;
pictureBox1.Image = bmp;
}
}
}Code: Select all
using (Bitmap bmp = new Bitmap ( 100, 100 ))
using (Graphics g = Graphics.FromImage ( bmp ))
using (Pen p = new Pen ( Color.FromArgb ( 128, Color.Blue ), 1 ))
using (Brush b = new SolidBrush ( Color.FromArgb ( 128, Color.Blue ) ))
{
g.FillEllipse ( b, 0, 0, 99, 99 );
g.FillRegion ( b, pictureBox1.Region );
}Due to th heavy use of the Draw... methodes the memory loss may sum up.
