//Returns the last Win32 error, in string format. Returns an empty string if there is no error.#ifdef UNICODEstd::wstring GetSysError(DWORD errCode)#elsestd::string GetSysError(DWORD errCode)#endif{	DWORD errorMessageID = errCode;	TCHAR* messageBuffer = nullptr;	size_t size = FormatMessage(		FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,		NULL,		errorMessageID,		MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),		(TCHAR *)&messageBuffer,		0,		NULL);#ifdef UNICODE	std::wstring message(messageBuffer, size);#else	std::string message(messageBuffer, size);#endif	//Free the buffer.	LocalFree(messageBuffer);	return message;