FieldAddress() Designtime vs Runtime. Why does it always return nil?

[knnknn]

How can I find out an address of a WinControl?

If the WinControl (e.g. a button) has been dropped on the Form1 at designtime it works like a charm.

But if I dynamically create a button then it doesn't.

Is there any way how to find out the address of the dynamically created Control?

addr := form1.FieldAddress('Button1'); // <--- WORKS! addr = C0493C, Button1 was put onto Form1 at DESIGN time

b := TButton.Create(form1);
b.Name := 'mybutton';
b.parent := Form1;
addr := form1.FieldAddress('mybutton'); // addr = NIL. Why?

 

[Glenn9999]

If the WinControl (e.g. a button) has been dropped on the Form1 at designtime it works like a charm. But if I dynamically create a button then it doesn't.

You are likely seeing this (and by likely I mean I'm 99.99% sure) because the button on design-time is statically associated with the TForm type. Your dynamically created control is not associated with the object, so Form1.FieldAddress doesn't work.

Is there any way how to find out the address of the dynamically created Control?

Yes. Typecast the control variable (b in your post above) to a pointer.


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