I want to write data in a file frequently ,
I wonder if I call CreateFile() each time I write it,
Does this way cost so much than the way that I just call it once ,then
use the handle many times?
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I want to write data in a file frequently ,
I wonder if I call CreateFile() each time I write it,
Does this way cost so much than the way that I just call it once ,then
use the handle many times?
If you are going to write to the file several times, it would be better to keep the handle returned by CreateFile(). Creating a kernel handle to a file will always be more inefficient that reusing the old handle (all other things being equal), but there may be other considerations to take into account. As always, you should measure the performance before and after you do any such optimizations.