INSSBuffer4::GetPropertyCount method (wmsbuffer.h)

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The GetPropertyCount method retrieves the total number of buffer properties, also called data unit extensions, associated with the sample contained in the buffer object. When using INSSBuffer4::GetPropertyByIndex to retrieve properties, the index used is between zero and the number specified by this method.

HRESULT GetPropertyCount(
  [out] DWORD *pcBufferProperties
);

[out] pcBufferProperties

Pointer to the size of buffer properties.

If the method succeeds, it returns S_OK. If it fails, it returns an HRESULT error code.

INSSBuffer4 Interface