IWMDMStorageGlobals::GetTotalFree method (mswmdm.h)
The GetTotalFree method retrieves the total amount of free space on the storage medium, in bytes.
HRESULT GetTotalFree( [out] DWORD *pdwFreeLow, [out] DWORD *pdwFreeHigh );
Pointer to a DWORD that receives the low-order part of the free space value.
Pointer to a DWORD that receives the high-order part of the free space value.
The method returns an HRESULT. All the interface methods in Windows Media Device Manager can return any of the following classes of error codes:
- Standard COM error codes
- Windows error codes converted to HRESULT values
- Windows Media Device Manager error codes
To determine the amount of storage space in use by the medium for file management, subtract the number of bad bytes retrieved using GetTotalBad from the number of free bytes retrieved using GetTotalFree.