首先导入类型库
#import "xxx.dll"
CoInitialize(NULL); //notice
_clsNewDentalEditor *p; //declare the pointer
HRESULT ht = CoCreateInstance(CLSID_clsNewDentalEditor, NULL, CLSCTX_INPROC_SERVER, IID__clsNewDentalEditor, (void **)&p);
CComVariant Param1, Param2, Param3, Param4; //notice
ht = p->Exec(&Param1, &Param2, &Param3, &Param4);
CoUninitialize();
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