Dynamicaly assigning methods
lazarus / 8-Other

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Adam.Pilorz · 2004-11-14 14:48

I have a problem. I'm creating a dynamic button (for example like
that:
Code: [Select]var MyButton: TButton;
...
MyButton:=TButton.Create(Self);
MyButton.Top:=2;
MyButton.Left:=2;
MyButton.Width:=200;
MyButton.Height:=28;
MyButton.Caption:='MyButton';)
And now how to assign a method to a dynamic button? Such thing should
work: Code: [Select]MyButton.OnClick:=MyForm.MyButtonClick;
Unfortunately, it doesn't do anything except halting compilation and
calling an error: Wrong number of parameters... Of course, compiler is
trying to assign a return value of MyButtonClick method. How to solve
this problem??

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mikiwoz · 2004-11-14 19:05

MyButton.OnClick:=@WhateverIsTheMethodsName should do the trick. I had
the same problem and that was the solution.

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Adam.Pilorz · 2004-11-14 21:45

Unfortunately, it ends with an error: Incopatible types: got "<address
of procedure(TObject) of Object;Register>" expected "<procedure
variable type of procedure(TObject) of Object;Register>"

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Vincent Snijders · 2004-11-15 08:32

This might be a compiler bug. What compiler version are you using?

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Adam.Pilorz · 2004-11-15 09:01

I'm using FPC 1.9.5 (2004/10/04). Should I change it??

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Marc · 2004-11-15 16:44

is TObject redeclared ? (are you still using {$mode objfpc} )

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Adam.Pilorz · 2004-11-15 18:17

{$mode objfpc} is in every main program. Shouldn't it?

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Marc · 2004-11-19 13:54

afaik in every unit