how to defien the extrudefeaturedata structure in COM?

Dear all, i define extrudefeaturedata as LPEXTRUDEFEATUREDATA2 pExtrudeFeatData; in VC 6.0 and when compiling, the system give me an error as(i am using solidworks 2006): D:\Cylinder\Cylinder.cpp(1722) : error C2065: 'LPEXTRUDEFEATUREDATA2' : undeclared identifier D:\Cylinder\Cylinder.cpp(1722) : error C2146: syntax error : missing ';' before identifier 'pExtrudeFeatData' D:\Cylinder\Cylinder.cpp(1722) : error C2065: 'pExtrudeFeatData' : undeclared identifier

i feel very strange, because in solidworks API i can only the data structure as ExtrudeFeatureData2...

if i change the definition as LPEXTRUDEFEATUREDATA pExtrudeFeatData;

when use the function of pExtrudeFeatData->IAccessSelections (pModelDoc, NULL, &accessGained); the system would give me error as error C2664: 'IAccessSelections' : cannot convert parameter 1 from 'struct IModelDoc2 *' to 'struct IModelDoc *'

it always used IModelDoc2 in Solidworks API 2006, never used i feel these errors are very strange, has anyone encountered the same problem and can give me some hint?

thanks very much cheers Shirley

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