Retrieves a child object in this file data object.
HRESULT GetChild( SIZE_T uiChild, ID3DXFileData ** ppChild );
If the method succeeds, the return value is S_OK. If the method fails, the return value can be one of the following values: D3DXFERR_BADVALUE, D3DXFERR_NOMOREOBJECTS.
Header: Declared in D3dx9xof.h.