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discostu · #1 (**permalink**) 05-16-2005

Hi, I have a member variable CShapes m_carPath for which I do AddLine( oldlocation, newlocation ) each time I update the car's position (represented by a pushpin). I have a reset button in this MFC app that when pressed deletes the pushpin representing the car and also attempts to delete all the lines associated with m_carPath (these are of type CShape). My code below seems to only delete every other line:

Code:

	VARIANT idx;
	VariantInit( &idx );
	V_VT(&idx) = VT_I4;
	for( long i = 1; i <= m_carPath.GetCount(); i++ ) {
		V_I4(&idx) = i;
		CShape shape = m_carPath.GetItem( &idx );
		shape.Delete();
	}

If I hit "Reset" over and over, more and more lines go away.
Any idea why? Please help. Thanks! -Stu

**Wilfried** · #2 (**permalink**) 05-16-2005

Hi,

I dont understeand the question very whell but is it not more easy to just move the pushpin to the new position and eventually change balloon information ?

discostu · #3 (**permalink**) 05-16-2005

Ok, my question was not about the pushpin. It was about a line that I am drawing to trail the pushpin. But your answer posts another question for me. So, I'm going to try and make it clear with two questions.

How do you just move a pushpin in c++? I read on the forums that you have to delete it everytime and make a new one at the new location.
My original question: Why does my code not delete all CShape instances in CShapes. In my OnTimer() function I "move" the pushpin (by deleting it, and making a new one -- see question 1). In the same OnTimer() function I also do AddLine(oldLocation, newLocation) to my CShapes instance. When I try to delete all these lines in CShapes instance. Only some, get deleted (it looks to be every other one).

If this is not clear let me know.
Thanks!
Stu

**Wilfried** · #4 (**permalink**) 05-17-2005

Hi,

Now I understeand

This example try to find a pushpin on the map, create a new if not found, and move the existing with the same name if found:

Code:

        private Pushpin MovePP(string name, double lat, double lon)
        {
            Location Loc = MP.ActiveMap.GetLocation(lat, lon, 1);
            Pushpin PP = MP.ActiveMap.FindPushpin(name);
            if (PP == null)
                PP = MP.ActiveMap.AddPushpin(Loc, name);
            PP.Location = Loc;
            PP.GoTo();
            return PP;
        }

As for your code, it will delet every other one because you delete very other one because of the index (i).. If you change it with a while loop it will work. Now you delete, then the index is removed, count is decrement, you increment index and delete 1 step higher. Common mistakes we all do once a while

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Deleting all CShape in CShapes

Deleting all CShape in CShapes

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Deleting all CShape in CShapes

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