My Delphi 2010 is sick

[himitsu]

address 00000xxx = nil

Something does not exist.

Zitat von Sailor:

Probably cbPath has not yet been created. Check it by adding "IF cbPath <> NIL" to the first line.

or if not Assigned(cbPath) then DoError; , Assert(Assigned(cbPath)); , Assert(cbPath <> nil); , ...

[WojTec]

@himitsu, you are talking about first or second address in message?

Let's say Delphi creates it incorrectly (I repeat: error after changes, before working) - what to do?

[mkinzler]

The second. The First is the adress of the Code itself.

[WojTec]

Ok. So, what to do now?

[mkinzler]

cbPath references not an existing Object. It seems that it is never set at all ( 0 = nil = nirvana)
Check if/where you set that variable.

[Stevie]

Your dfm file does not match the pas file.

When loading the form it streams the dfm file and creates the components and places the references in the published fields if they exist (yes, you can have a component on your form but no field in your pas file, if you don't need to access it). But it does not work the other way around. If you placed your component field in the published part (which is by default if you dont specify the visibility) but never created it yourself.

Usually the IDE also complains about this when saving your form (like "Field Form1.CheckBox1 does not have a corresponding component. Remove the declaration?")

Also: did you call inherited in your custom constructor?

[WojTec]

Delphi-Quellcode:

constructor Create(const AFirst, ASecond: TColor; const ASteps: TByteVal);
begin
  inherited Create(Application);

  // ...
end;

// ...

RenderGradient({...}, cbPath.Checked); // <-- no problem

// ...

if cbPath.Checked then // <-- AV here

Component is added to DFM.

Please note 2nd error showing another component (which is working before I add check box), not this check box (1st error). All component are created properly (form --> check box --> build --> run --> ok), due I want to access it in if statement (in function call I used the same propery and no errors).