Question

Delphi Xe.

in delphi help: “…Calling this function usually resets the operating system error state…”

How to reset a current error on 0? I.e. that GetLastError=0

Example:

Try
// There is an error
except
showmessage(inttostr(getlasterror)); // Ok, getlasterror<>0
end;
....
// no errors
....
// How to reset a current error on 0?
showmessage(inttostr(getlasterror)); // Again will be <> 0

Answer 1

You should only be calling GetLastError when there has actually been an error. Some Windows API functions will reset the error to 0 on success, some won’t. Either way, you should only interrogate the error state when you need to know the most recent error.

Note that there is a SetLastError method as well, but that doesn’t help you; if you set the last error to 0, then of course GetLastError will return 0.