[lazarus] Trying to port a Delphi graph
marc at dommelstein.net
Sun Mar 30 16:38:35 EST 2003
At 15:44 30-3-2003 -0600, Tony Maro wrote:
>I'm trying to port a 3D graph unit I found for Delphi. I've already
>done much of the conversion (messages and such) but ran into the
>var i : LongInt;
> For i := 0 to FTrapezes.Count-1 do begin
> FTrapezes[i] := nil;
>FTrapezes is defined as:
>FTrapezes : TList; //casts to PTrapezeInfo
>But when it hits the "Dispose" line, I get:
>"Use of NEW or DISPOSE is not possible for untyped pointers"
>I'm not familiar with the DISPOSE keyword or function. Can someone help
>me decipher what is supposed to be happening here?
Dispose is the opposite of New.
With New you can allocate dynamic variables like:
if you don't need your variable anymore you should use Dispose to fee memory
In this case Dispose(P);
FPC in your case complains, since it doesn't know how to dispose a pointer.
You can avoid that by casting FTrapezes[i] to the PointerType it contains
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