[Lazarus] Different behavior of method and class variables

[Mattias Gaertner]

On Sun, 29 Nov 2015 11:07:11 -0300
Leonardo M. Ramé <l.rame at griensu.com> wrote:

> I'm creating a class out of a C header converted to pascal using h2pas.
> 
> I created this type:
> 
> pRobotArray = ^TArray0toMAX_ROBOT_DRIVES1OfHANDLE;
> 
> If I use it inside a method, like this:
> 
> procedure TMyClass.myMethod;
> var
>    lRobots: pRobotArray;
> begin
>    getRobots(lHRobots);
>    lRobots := @lHRobots; // this works ok.

No, lHRobots is not defined.


> end;
> 
> If I add an FRobots var to my class:
> 
> TRobotClass = class
> private
>    FRobots: pRobotArray;
> public
>    procedure myMethod;
> end;
> 
> procedure TMyClass.myMethod;
> begin
>    getRobots(lHRobots);
>    FRobots := @lHRobots; // I get an external SIGSEGV.
> end;
> 
> Why the difference?.

Please provide a complete example.

Mattias