IEnumFilters* pEnum;

HRESULT hr ;

if (pigb)

{

hr = pigb-> EnumFilters(&pEnum);

if (FAILED(hr)) 

{

return ;

}

     

IBaseFilter* pFilter = NULL;

while (pEnum->Next(1, &pFilter, NULL) == S_OK) 

{

// Check for required interface

IUnknown* pUnk;//查找Filter接口,只有一个？

HRESULT hrQuery = pFilter->QueryInterface(IID_IVideoWindow, (void**)&pUnk);

if (SUCCEEDED(hrQuery)) 

{

pUnk->Release();

pEnum->Release();

break ;

}

// pFilter->Release();

}

 //  pEnum->Release();

//

ISpecifyPropertyPages *pProp = NULL;//查询接口

hr = pFilter->QueryInterface(IID_ISpecifyPropertyPages, (void **)&pProp);

if (SUCCEEDED(hr)) 

{

// Get the filter's name and IUnknown pointer.

FILTER_INFO FilterInfo;

hr = pFilter->QueryFilterInfo(&FilterInfo); 

IUnknown *pFilterUnk;

pFilter->QueryInterface(IID_IUnknown, (void **)&pFilterUnk);

//

CString str(FilterInfo.achName);//显示Filter名称

MessageBox(str);

// Show the page. 

CAUUID caGUID;

pProp->GetPages(&caGUID);

pProp->Release();

OleCreatePropertyFrame(

this->GetSafeHwnd(),                   // Parent window

0, 0,                                 // Reserved

FilterInfo.achName,     //L"MAOMAO" // Caption for the dialog box 

1,                      // Number of objects (just the filter)

&pFilterUnk,            // Array of object pointers. 

caGUID.cElems,          // Number of property pages

caGUID.pElems,          // Array of property page CLSIDs

0,                      // Locale identifier

0, NULL                 // Reserved

);

// Clean up.

pFilterUnk->Release();

FilterInfo.pGraph->Release(); 

CoTaskMemFree(caGUID.pElems);

}

}

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