Editing Pictures

[shachar424]

this is my first question here and i hope it will be helpfull.

I'm trying to upload a picture to pictureBox and then to rotate this picture
but my problem is that when i want to save the picture after I rotate it he send me error message and told me that another program use this file (probably my program).

any ideas how to overcome this problame?

[Plater]

I imagine you are opening the file with something like Bitmap.FromFile (or Image.FromFile)
It keeps the filehandle open. What you would do is .Clone() it to another Image/Bitmap object. Then .Dispose() of the first one (closes the file handle)

You now have you picture object and the filehandle is closed. You are free to overwrite the file.

[shachar424]

thanks, but it's still don't work
is there any other way to open file not with image.fromFile
so that the stream will stay close?

[Plater]

Ok, my mistake, the Clone() keeps the filehandle open too.

This seemed to work though:

string fn= @"C:\myjpg.jpg";
 
Bitmap bm = (Bitmap)Bitmap.FromFile(fn);
Bitmap bm2 = (Bitmap)bm.GetThumbnailImage(bm.Width, bm.Height, null, IntPtr.Zero); 
bm.Dispose();
 
bm2.Save(fn);
 

[shachar424]

thanks again, but i think its more complicated im my program because i save this picture in more then one copy.

[Plater]

What do you mean more then one copy?

[shachar424]

i mean that i upload the picture to two pictureBox
and i save the images in arraylist, but now its ok, i change my program so that you can rotate the picture just at the first time you upload it.
hope you understand what i mean, but thanks anyway :)

[Plater]

Oh ok so you have two copies of it open?

I would make a function like:

private Image OpenImageFile(string filename)
{
Image retval;
Bitmap bm = (Bitmap)Bitmap.FromFile(fn); 
Image = bm.GetThumbnailImage(bm.Width, bm.Height, null, IntPtr.Zero);  
bm.Dispose(); 
return retval;
}
 

So no matter how many times I open the file, it's always closed and I have an image object for it.

[shachar424]

good idea , i try it, thanks

[Frinavale]

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[tlhintoq]

Might I also suggest that putting it into the picture box when you know you are going to rotate it as the next step seems a little odd.

I would think you would load the image, rotate the image, then once you have what you really want - then - you would display it in the picture box.