[RESOLVED] Locking Jpg File in PictureBox

[laz713]

I am using a listbox to scroll thru a folder with jpg files.
While scrolling down I can find one that I want to move to another folder.
I dispose and refresh the picture box(to close the jpg file) and it always allows me to move the file.

When I am scrolling up the listbox I see a image that I want to move.
I dispose and refresh the picutre box(to close the jpg file) and it always gives me an IO.Exception saying that the file is in use by another process.
PLEASE tell me what I am doing wrong........

[maged]

this is due the picturbox you use is keeping the file open while it is showed in it ( i dont know why , but it is very strange - i faced it before)

you need to unlink the picture box from the file before attemping to do anytrhing with it.

one of the possible solutions is setting the image property to nothing.

example

picture1.image = nothing
application.doevents
'then do whatever you want 
 
'if you want to reload the image again, reload it from its new position.

if this didn't work, because somethimes the computer needs some time before unlinking the image . you must enforce it by loading other image ( a temperoraly image, like plz wait or someting)

rgds

[grilkip]

You can load the picture in a different way so it releases the file.

PictureBox1.Image = DirectCast(Image.FromFile("yourfile).Clone, Image)
'or
PictureBox1.Image = New Bitmap(Image.FromFile("yourfile")) 'wosscredit

[Phill64]

This is a feature in the image object to save memory by reading from the file all the time, since images can be quite large.

please see my codebank example (link below) which uses IOStreams to manually open and close image files rather than allowing it to be automatically handled

http://www.vbforums.com/showthread.php?t=356433

[laz713]

That fixed it!!

thanks Phill

[MrPolite]

well whether you create a new bitmap or you clone it, I suggest you dispose the old image. I dont see any of that above
ie....
dim img as image = image.fromfile ("path here")
dim bmp as new bitmap (img)
img.dispose ()

now use the bmp object