topic run-time check failure #2 - Point corrupted in ObjectARX Forum

run-time check failure #2 - Point corrupted

Anonymous — Tue, 12 Mar 2013 12:43:48 GMT

I have been trying to figure this out for a few days now and have been having some problems. I tried to do some research Run-Time Check Failure #2 - Stack around the variable 'name'' was corrupted and The "Big Picture" - Interview with Jim Quanci (Autodesk) but neither really helped me too much. The ObjectArx & Dummies seemed to point to the fact that I had a memory leak but if that was the case I am not sure how exactly.

void drawCable(){
   AcDbPolyline *pLine = new AcDbPolyline();
   int vertexPoint = 0;
   AcGePoint2d tempPoint;
   int result = acedGetPoint(NULL,_T("\nSelect the first point:"),asDblArray(tempPoint));
   while(result == RTNORM){
       pLine->addVertexAt(vertexPoint,tempPoint);
       vertexPoint++;
       result = acedGetPoint(NULL,_T("\nSelect the point:"),asDblArray(tempPoint));
   }
   postToDb(pLine);
   pLine->close();
}

Any advice would be greatly appreciated. Thanks in advance like usual.

Re: run-time check failure #2 - Point corrupted

Alexander.Rivilis — Tue, 12 Mar 2013 13:06:50 GMT

Change:

AcGePoint2d tempPoint;

with:

AcGePoint3d tempPoint;

And change:

pLine->addVertexAt(vertexPoint,tempPoint);

with:

pLine->addVertexAt(vertexPoint,AcGePoint2d(tempPoint.x, tempPoint.y));

Re: run-time check failure #2 - Point corrupted

Anonymous — Tue, 12 Mar 2013 13:48:43 GMT

Excellent it worked like a charm.

What exactly was the issue with the way that I was doing it? Was it because when I was only accepting a 2d point when AcedGetPoint is trying to put in a 3d point?

Re: run-time check failure #2 - Point corrupted

Alexander.Rivilis — Tue, 12 Mar 2013 14:07:45 GMT

@Anonymous wrote:
...Was it because when I was only accepting a 2d point when AcedGetPoint is trying to put in a 3d point?...

Yes of course! acedGetPoint "thinks" that you pass a pointer to an array of three double, but you pass a pointer to an array of two double. That is why the function wrote third double to invalid location.

Re: run-time check failure #2 - Point corrupted

Anonymous — Tue, 12 Mar 2013 14:16:23 GMT

Excellent thanks,

I was reading up on the poly class and I see that instead of incrementing the vertexPoint that I have in my code I could just do something like this.

pLine->addVertexAt(pLine->numVerts(),AcGePoint2d(tempPoint.x,tempPoint.y));

I am going to figure that incrementing my number would be the simpler way to go since it would only require a simple increment rather then looking up the value from the polyline?

I guess not that I have this figured out I now just need to see how to use this to include the jig class.

Re: run-time check failure #2 - Point corrupted

Alexander.Rivilis — Tue, 12 Mar 2013 22:18:52 GMT

Zanzabar wrote:

...I am going to figure that incrementing my number would be the simpler way to go since it would only require a simple increment rather then looking up the value from the polyline?...

I think that AcDbPolyline has a class member with number of vertexes and not very much difference between the use of both ways.

@Anonymous wrote:
...I guess not that I have this figured out I now just need to see how to use this to include the jig class...

I've posted a small sample project which make Polyline with JIG. You can develop it further as you sees fit.