save image to PC directory

Question

i don't know why when i  save the same picture to the same directory,it causes the error message: "A generic error occred in GDI+"??????
but if i change another picute to save , it works properly

my code is as belows:
 Image img = Image.FromFile(this.picBox2.ImageLocation.ToString());
                    
img.Save(@"D:\Temp\111.jpeg", System.Drawing.Imaging.ImageFormat.Jpeg);

how can i prevent this error when i save the same picture?

Answer 1

Hi,

you'll have to release the File first - means the Image you load from FileSystem, in your case it's the image in the picBox2:

      Image img = Image.FromFile(@"D:\Temp\111.jpeg");
      Bitmap bmp = new Bitmap(img);
      img.Dispose();
      img = null;

      bmp.Save(@"D:\Temp\111.jpeg", System.Drawing.Imaging.ImageFormat.Jpeg);
      if (picBox2.Image != null)
      {
        picBox2.Image.Dispose();
        picBox2.Image = null;
      }
      this.picBox2.Image = bmp;

regards,

  Thorsten

Answer 2

Hi,

you'll have to release the File first - means the Image you load from FileSystem, in your case it's the image in the picBox2:

   Image img = Image.FromFile(@"D:\Temp\111.jpeg");

   Bitmap bmp = new Bitmap(img);

   img.Dispose();

   img = null;



   bmp.Save(@"D:\Temp\111.jpeg", System.Drawing.Imaging.ImageFormat.Jpeg);

   if (picBox2.Image != null)

   {

    picBox2.Image.Dispose();

    picBox2.Image = null;

   }

   this.picBox2.Image = bmp;

regards,

  Thorsten

you mean i need to dispose the image

what is different dispose image and set image to null

Answer 3

to set an image-variable to null, sets the reference to that image to null, it doesn't do a cleanup-process. I use it for (absence) testing only:

if (someObject == null) ...

Dispose should be used with any unmanaged resources like streams Images Brushes and so on.

http://msdn.microsoft.com/en-us/library/system.idisposable.dispose.aspx

http://en.wikipedia.org/wiki/Dispose_pattern

regards,

  Thorsten