5 然后利用imoniker::bindtoobject生成绑定道设备上的filter。调用ifiltergraph::addfilter将filter添加到graph图中。
图1
// create the system device enumerator.
hresult hr;
icreatedevenum *psysdevenum = null;
hr = cocreateinstance(clsid_systemdeviceenum, null, clsctx_inproc_server,
iid_icreatedevenum, (void **)&psysdevenum);
if (failed(hr))
{
return hr;
}
