Convert DgnModelRefP to DgnModelCR

Hi Benzi,

quick first thought: AsDgnModel returns constant pointer, whereas you assign it to DgnModel constant reference. Are you sure casting (dereferencing) from pointer to reference is done automatically and correctly?

With regards,

  Jan

I'm not sure the casting is done correctly and that's why I suspect that line of code. I also tried using this instead:

DgnModelRefP activeModelRefP = mdlModelRef_getActive();
DgnModelCR activeModelCR = *activeModelRefP->GetDgnModelP();

with similar results.

When I use this:

DgnModelRefP activeModelRefP = mdlModelRef_getActive();
DgnModelCR activeModelCR = activeModelRefP->GetDgnModelP();

I get a compiler "no suitable constructor to convert" error.

Benzi Papo said:

I think the activeModelCR is incorrectly defined

This article discusses the typedefs in the MicroStationAPI. 

DgnModelCR is an alias of typedef of DgnModel generated by a macro in DgnPlatform.h.  Once you dispense with the noise, you will see something like this:

typedef DgnModel& DgnModelR;
typedef DgnModel const& DgnModelCR;

NamedBoundaryCollection::Create takes a DgnModel by const reference.  What that tells you is the the function will not attempt to modify the DgnModel.

Benzi Papo said:

I'm not sure the casting is done correctly

You're declaring a variable of type const reference to the type you receive from a function. If the compiler is satisified then look to  NamedBoundaryCollection::Create().  Unfortunately there is no example for named boundaries.

I seem to have confused Named Boundary with Drawing Boundary. The following code actually runs as expected:

// find named boundaries
DgnModelRefP activeModelRefP = mdlModelRef_getActive();
DgnModelCR activeModelCR = *activeModelRefP->GetDgnModelP();

NamedBoundaryCollectionPtr collection = NamedBoundaryCollection::Create(activeModelCR);
boundaryCount = collection->GetCount();

for (NamedBoundaryCollection::const_iterator iter = collection->begin(); iter != collection->end(); ++iter)
{
	WString name = (*iter)->GetName();
	ElementHandle elemHandle = (*iter)->GetGraphicalElement();
	MSElementCP elemCP = elemHandle.GetElementCP();
}

I was trying to access the Drawing Boundaries contained in a sheet model which requires different coding.

Thanks for helping me figure that out.