vc中的COMPONENT在delphi如何申明var？(50分)

我申明为comp为TCOMPONENT，但comp.dwSize等等，运行不过去，说没有申明
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IActiveDesktop *pAD;
COMPONENT comp;
CoCreateInstance( CLSID_ActiveDesktop, NULL, CLSCTX_INPROC_SERVER,
IID_IActiveDesktop (LPVOID*)&pAD );
comp.dwSize = sizeof(COMPONENT);
comp.iComponentType = COMP_TYPE_HTMLDOC;
comp.wszSource = TEXT("http://www.server.com/doc.htm");
pAD->AddDesktopItem( &comp, 0 );
pAD->ApplyChanges(AD_APPLY_ALL);
pAD->Release();

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