Question

I am currently developing backup software, which I was using File.Copy() to copy files.

However File.Copy() doesn’t have the option to cancel, so after a bit of googling I found CopyFileEx does. I had a look through the P/Invoke docs but I can’t work out how I can actually send the flag to cancel it without calling the whole function again.

Can I just set a bool value and reference that, and will CopyFileEx detect that it has changed if I change it from somewhere else?

Any help or examples appreciated.

Answer 1

Yes, see http://msdn.microsoft.com/en-us/library/windows/desktop/aa363852(v=vs.85).aspx

If this flag is set to TRUE during the copy operation, the operation is canceled. Otherwise, the copy operation will continue to completion.