iostream using pointer

typedef TArray<CShape*> CShapes;
typedef TArrayIterator<CShape*> CShapesIterator;

CShapes *shapes = new CShapes(10, 0, 10);


void TDrawWindow::save()
{

ofstream os("c:\\abc.txt");
CShapesIterator i(*shapes );

while (i) {
CShape *p = i++;

os<<p;
}

}

is it correct or not?
if it is correct then how to retrive it from file

I have done so but it is not working.


void TDrawWindow::Open()
{
ifstream is("c:\\abc.txt");


shapes ->Flush();

unsigned numPoints;

is >> numPoints;

while (*numPoints--) {
CShape shape;
is >> shape;
shapes->Add(&shape);
}

Invalidate();

}

No, not correct. You're only saving the pointer value.
Unless there is a specific overload of << for TObject * or TShape *. If not you'll have to do
os << *i;
and overload the << operator for const TShape &.

Thanks



friend ostream& operator<< ( ostream& os, CShape& shape );
ostream& operator<< ( ostream& s, CLine& dt )
{
s << shape .pt1 << shape .pt2 << '\n';;
return s;
}

this is what I have done for direct access.
But How to overload for pointer

Quote:

---

Originally posted by purusingh
Thanks



friend ostream& operator<< ( ostream& os, CShape& shape );
ostream& operator<< ( ostream& s, CLine& dt )
{
s << shape .pt1 << shape .pt2 << '\n';;
return s;
}

this is what I have done for direct access.
But How to overload for pointer

---

You dont have to overload for pointers. Just dereference p.

Z.

please show me how to use it in these functions


void TDrawWindow::save()
{

ofstream os("c:\\abc.txt");
CShapesIterator i(*shapes );

while (i) {
CShape *p = i++;

os<<p;
}




void TDrawWindow::Open()
{
ifstream is("c:\\abc.txt");


shapes ->Flush();

unsigned numPoints;

is >> numPoints;

while (*numPoints--) {
CShape shape;
is >> shape;
shapes->Add(&shape);
}

Invalidate();

}

Didn't I already?

Code:

---

while (i) {
  CShape *p = i++;
  os<<*p;
}

---

And make the prototype of the << operator
ostream& operator<< ( ostream& s, const CLine& dt);

yes I did so but it is not working.

In that case my knowledge fails.

In your Load function, you read the number of shapes saved. You never save that value in your save function.

Z.

Also, while(*numPoints--) should be while(numPoints--), since it isnt a pointer value.

Z.