IltmmFilterEnum Example for C++
HRESULT hr = S_OK; CComPtr<IltmmFilterEnum> filterEnum; hr = CoCreateInstance(CLSID_ltmmFilterEnum, NULL, CLSCTX_INPROC_SERVER, IID_IltmmFilterEnum, (void**)&filterEnum); if(FAILED(hr)) { AfxMessageBox(_T("Can't instantiate IltmmFilterEnum library")); Beep(750,250); } BSTR bstr = SysAllocString(L"LEAD Audio SPDIF Passthru"); long value = 0; // get the Merit of the LEAD Audio SPDIF Passthru filter hr = filterEnum->get_Merit(bstr, &value); // Increase the Merit value = value + 100; // Set the New Merit hr = filterEnum->put_Merit(bstr, value); VARIANT_BOOL isEnable; // Determine whether the filter is Enabled hr = filterEnum->get_Enable(bstr, &isEnable); // Disable the filter hr = filterEnum->put_Enable(bstr, VARIANT_FALSE); // Free the string SysFreeString(bstr);