public void EditAndSave(String fileName) {
Bitmap b = new Bitmap(fileName);
/**
* Edit bitmap b... draw stuff on it...
**/
b.Save(fileName); //<---------Error right here
b.Dispose();
}
My code is similar to the above code. When i try to save the file i just opened, it won't work. When i try saving it with a different path, it works fine. Could it be that the file is already open in my program so it cannot be written to? I'm very confused.
You are correct in that it is locked by your program and therefore you can't write to it. It's explained on the msdn-page for the Bitmap class (http://msdn.microsoft.com/en-us/library/3135s427.aspx).
One way around this (from the top of my head, might be easier ways though) would be to cache image in a memorystream first and load it from there thus being able to close the file lock.
static void Main(string[] args)
{
MemoryStream ms = new MemoryStream();
using(FileStream fs = new FileStream(@"I:\tmp.jpg", FileMode.Open))
{
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
ms.Write(buffer, 0, buffer.Length);
}
Bitmap bitmap = new Bitmap(ms);
// do stuff
bitmap.Save(@"I:\tmp.jpg");
}
I've not been in exactly the same situation as you, but I have had problems with open image files being kept open.
One suggestion is that you load the image into memory using the BitmapCacheOption.OnLoad, see my answer to this post: Locked resources (image files) management.
Then, after editing, that image can be saved to the the same file using a FileStream, that is described for example here: Save BitmapImage to File.
I'm not sure it is the easiest or most elegant way, but I guess it should work for you.
Indeed there may be many reasons for seeing this exception.
Note that if you're using PixelFormat.Format16bppGrayScale, it's not supported in GDI+ and fails in the way shown. It seems the only workaround for using proper 16-bit gray scale is to use the newer System.Windows.Media namespace from WPF.
