IMDSPEnumStorage::Next method (mswmdm.h)

The Next method returns a pointer to the next celtIMDSPStorage interfaces.

Syntax

HRESULT Next(
  [in]  ULONG        celt,
  [out] IMDSPStorage **ppStorage,
  [out] ULONG        *pceltFetched
);

Parameters

[in] celt

Number of storage interfaces requested.

[out] ppStorage

Array of celtIMDSPStorage interface pointers allocated by the caller. Return NULL if no more storage media exist, or an error has occurred. If celt is more than 1, the caller must allocate enough memory to store celt number of interface pointers.

[out] pceltFetched

Pointer to a ULONG variable that receives the count of interfaces returned.

Return 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

Remarks

When there are no more storage interfaces, or when there are fewer storage interfaces than requested, the return value from Next is S_FALSE. When this happens, the pceltFetched parameter must be queried to determine how many interfaces, if any, were returned.

The storage enumerator may not reflect the effect of media insertion and removal. In such cases, the client should obtain a new enumerator object.

This method must be implemented. It must not return WMDM_E_NOTSUPPORTED or E_NOTIMPL. For more information, see Mandatory and Optional Interfaces.

Requirements

See also

IMDSPEnumStorage Interface

IMDSPStorage Interface

IWMDMStorage Interface