The DIDEVICEOBJECTINSTANCE structure is defined as :-

struct DIDEVICEOBJECTINSTANCE {
DWORD dwSize;
GUID guidType;
DWORD dwOfs;
DWORD dwType;
DWORD dwFlags;
TCHAR tszName[MAX_PATH];
DWORD dwFFMaxForce;
DWORD dwFFForceResolution;
WORD wCollectionNumber;
WORD wDesignatorIndex;
WORD wUsagePage;
WORD wUsage;
DWORD dwDimension;
WORD wExponent;
WORD wReportId;
};