Web Reference: Mar 11, 2023 · The winreg.h header defines RegQueryValueEx as an alias that automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. When calling the RegQueryValueEx function with hKey set to the HKEY_PERFORMANCE_DATA handle and a value string of a specified object, the returned data structure sometimes has unrequested objects. Your app is calling the TCHAR -based RegQueryValueEx(), which is actually a preprocessor macro that maps to either RegQueryValueExA() (ANSI) or RegQueryValueExW() (Unicode), depending on whether UNICODE is defined at compile-time.
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