I Need to access a strict private class var value of a class using his instance and a offset to the variable.
so far tried this , check this sample class
type
TFoo=class
strict private class var Foo: Integer;
public
constructor Create;
end;
constructor TFoo.Create;
begin
inherited;
Foo:=666;
end;
//this function works only if I declare the foo var as
//strict private var Foo: Integer;
function GetFooValue(const AClass: TFoo): Integer;
begin
Result := PInteger(PByte(AClass) + 4)^
end;
As you see the function GetFooValue works only when the foo variable is not declarated like a class var.
The question is how I must modify the GetFooValue
in order to get the value of Foo
when is declarated like strict private class var Foo: Integer;
To access a strict private class var, Class Helper
to rescue.
Example :
type
TFoo = class
strict private class var
Foo : Integer;
end;
TFooHelper = class helper for TFoo
private
function GetFooValue : Integer;
public
property FooValue : Integer read GetFooValue;
end;
function TFooHelper.GetFooValue : Integer;
begin
Result:= Self.Foo; // Access the org class with Self
end;
function GetFooValue( F : TFoo) : Integer;
begin
Result:= F.GetFooValue;
end;
Var f : TFoo;//don't need to instantiate since we only access class methods
begin
WriteLn(GetFooValue(f));
ReadLn;
end.
Updated example to fit the question.