char * is fail in CArray while char[] is success

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Hi Experts,
i have following structure

typedef struct xy{
int num;
char *val;
}XY;

struct XYArray:public CArray<XY,XY>
{
};

in cpp file, in a function
struct XYArray Obj;
Now i can add XY type variable to Obj like
XY A;
A.num=1; A.val=str;
// suppose str is a char *array which contains some value.
Obj.Add(A); // add XY type variable to Obj
Suppose i add 10 elements to Obj. Now when i get each element of Obj then i
found that value of val field of XY structure has been change. i.e.
XY B=Obj.GetAt(0);
B.val is not which i add in Obj.

While if i declare XY as
typedef struct xy{
int num;
char val[250];
}XY;
and add data to Obj like
XY A;
A.num=1;
memcpy(A.val,str,strlen(str)); // suppose stris a char *array which contains
some value.
Obj.Add(A);

In this case when i get each element of Obj, i found right value.


So please tell how to solve this problem. why char * is fail in CArray?
while char[] is success.


.

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