Here is a code fragment showing how to list constraints and cast EntityOne and EntityTwo into appropriate proxies. Graphically the constraint and two proxies look like this:
// Get the list of constraints of the assembly so you can add a new one
CComPtr<AssemblyConstraints> pConstraintList = nullptr ;
hRes = pAssemblyCompDef->get_Constraints(&pConstraintList) ;
if (FAILED(hRes) || (pConstraintList == nullptr)) {
TRACE (L"Could not get constraints.") ;
return ;
}
// List the two entities of each MateConstraint...
for (int i = 1 ; i <= pConstraintList->Count ; i++) {
CComPtr<AssemblyConstraint> pConstraint = nullptr ;
pConstraintList->get_Item (CComVariant(i),&pConstraint) ;
CComQIPtr<MateConstraint> pMate (pConstraint) ;
if (nullptr != pMate) {
// This is a mate constraing, show more data about it...
IDispatchPtr pEnt1 = pMate->EntityOne ;
IDispatchPtr pEnt2 = pMate->EntityTwo ;
TRACE (L" Two parts are %p %p\n",pEnt1,pEnt2) ;
CComQIPtr<FaceProxy> pFace1 = CComQIPtr<FaceProxy>(pEnt1);
CComQIPtr<WorkPlaneProxy> pWP1 = CComQIPtr<WorkPlaneProxy>(pEnt1);
if (pFace1 != nullptr) {
TRACE (L" Ent1 is a face proxy...\n") ;
} else if (pWP1 != nullptr) {
TRACE (L" Ent1 is a workplane proxy...\n") ;
CComPtr<ComponentOccurrence> pContOcc = pWP1->ContainingOccurrence ;
if (pContOcc != nullptr) {
CComPtr<ReferencedFileDescriptor> pFileDesc = nullptr ;
pContOcc->get_ReferencedFileDescriptor (&pFileDesc) ;
if (pFileDesc != nullptr) {
CComBSTR bstrFullFileName ;
pFileDesc->get_FullFileName (&bstrFullFileName) ;
TRACE (L" Ent1 full file name is %s\n",bstrFullFileName) ;
}
}
} else {
TRACE (L" Ent1 This is neither a face or workplane proxy\n") ;
}
}
}