invalid pointer access

[Essam Daoud]

Hi

This error "invalid pointer access" is that I get from this code, any suggestion how to fix it?

#include<Arrays\List.mqh>

CList lineList;
class Line : public CObject 
{
public:
   string name;
   string description;
   double value;   
};

//... stuff
double p = 100.46;
Line *line = lineList.GetNodeAtIndex(i);
line.value = p; //<<<<<<<<<<<<<<<<<<<<<<<<<<<<  invalid pointer access

[Anthony Garot]

samjesse:

any suggestion how to fix it?

Add a node into lineList.

lineList.Add(new Line());

[Essam Daoud]

Anthony Garot:

Add a node into lineList.

I need to modify a current item not to add a new one.

[Anthony Garot]

samjesse:

I need to modify a current item not to add a new one.

The error occurs because the node at index "i" doesn't exist.

Show the code where you add the nodes so we can see why this is the case.

Also, tack this into your code. It may reveal what's going on.

        Line *line = lineList.GetNodeAtIndex(i);
        PrintFormat("list count [%d] i [%d]", lineList.Total(), i);
        if ( line == NULL )
        {
                Print("line is null");
        }
        else
        {
                line.value = p;
        }