How do I convert an HRESULT to a Win32 error code?

Raymond Chen November 3, 2006 Nov 3, 2006 11/3/06

Everybody knows that you can use the HRESULT_FROM_WIN32 macro to convert a Win32 error code to an HRESULT, but how do you do the reverse? Let's look at the definition of HRESULT_FROM_WIN32: If the value is less than or equal to zero, then the macro returns the value unchanged. Otherwise, it takes the lower sixteen bits and combines them ...