copy the value of one pointer to another???? 2

[ivoestg]

how can i copy the value of a tlist to other tlist,then destroy the first tlist and keep the values in the second tlist...can you dend me the code to do that? thanks...

 

[TealWren]

I'm not sure if this is what you're looking for...


procedure CopyList(fromList,toList: TList);
var x: longint;
begin
for x := 0 to fromList.count-1 do
begin
toList.Add(fromList[x]);
end;
end;


That procedure will put all of the items in the first list into the second list. Then you can safely free the first list. Freeing a list does not free the objects in the list so the second list will have the same data that the first had, if that makes sense.

Good luck!
TealWren

 

[sggaunt]

Hi Ivoestg

It is possible to copy the whole list lista := listb , but tealwrens solution is safer. and more likly to work.

You need to clear the data out of list objects before freeing them as suggested.

e.g.
fromlist.clear;
fromlist.free;

Steve

 

[TealWren]

Actually, a Clear won't free the data objects either. You have to loop through the list and free them yourself. Clear just clears the pointers out of the list. TealWren