Microsoft DirectX 8.1 (C++)

CSourceSeeking::CheckCapabilities

The CheckCapabilities method queries whether the stream has specified seeking capabilities. This method implements the IMediaSeeking::CheckCapabilities method.

Syntax

HRESULT CheckCapabilities(
    DWORD *pCapabilities
);

Parameters

pCapabilities

Pointer to a bitwise combination of one or more AM_SEEKING_SEEKING_CAPABILITIES attributes.

Return Value

Returns one of the HRESULT values listed in the following table.

Value Description
S_FALSE Not all of the capabilities in pCapabilities are present.
S_OK All capabilities in pCapabilities are present.
E_POINTER NULL pointer argument.

Remarks

As implemented, this method checks the value of *pCapabilities against the CSourceSeeking::m_dwSeekingCaps member variable. However, it does not set *pCapabilities equal to m_dwSeekingCaps, as described for the IMediaSeeking::CheckCapabilities method. Also, in the case where none of the specified capabilities are available, the method does not return E_FAIL. A more complete implementation would be as follows:

DWORD dwCaps;
HRESULT hr = GetCapabilities(&dwCaps);
if (SUCCEEDED(hr))
{
    dwCaps &= *pCapabilities;
    hr =  dwCaps ? ( dwCaps == *pCapabilities ? S_OK : S_FALSE ) : E_FAIL;
    *pCapabilities = dwCaps;
}
else *pCapabilities = 0;
return hr;

See Also