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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