How to modify TList value?

Question

Delphi 2010 How to modify TList < record > value ?

type TTest = record a,b,c:Integer end;
var List:TList;
    A:TTest;
    P:Pointer;
....
..         


        

Answer 1

If you want to store records, dynamic arrays are more suited to handling them :

type TTest = record a,b,c : Integer end;
type TTestList = array of TTest;
var List:TTestList;
    A:TTest;
    P:Pointer;
....
....

SetLength( List, 20 );
List[10]   := A; //<- OK
List[10].a := 1; //<- Ok
P := @List[10];  //<- Not advised (the next SetLength(List,xx) will blow the address away),
                 //   but technically works

If you need to add methods to manipulate these data, you can store this array as the field of a class, and add your methods to this class.