GrtProcessByName and GetCurrentProcess
in [CSharp]
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From: Morris on 12 Apr 2010 04:35 Comparing the handle received from GrtProcessByName and GetCurrentProcess on the current pocess yield with different results. Anyone knows why? Regards Morris
From: Peter Duniho on 12 Apr 2010 04:02 Morris wrote: > Comparing the handle received from GrtProcessByName and GetCurrentProcess on > the current pocess yield with different results. > Anyone knows why? The short answer: because there's no guarantee that the handle returned should be the same. The longer answer� I haven't looked at the exact behavior. But I suspect that Process.GetCurrentProcess() method calls the unmanaged GetCurrentProcess() function, while the Process.GetProcessesByName() method calls the unmanaged OpenProcess() function. These two functions are different in at least two notable ways: � GetCurrentProcess() is documented to return a _pseudo_-handle, with value -1. That is, it doesn't even open a new handle; it just returns a magic value that when used as a process handle, refers to the current process. � OpenProcess() will create a new handle, not necessarily the same handle value returned in a previous or subsequent call to OpenProcess() for the same process ID. Just as you should not compare strings for equality by comparing their references, you should not compare processes for equality by comparing the handle you have for each process. Use the process ID instead. Pete
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