My Delphi 2010 is sick

[WojTec]

It is 14.0.3593.25826.

This thread can be continuation of that thread: Delphi don't recompile changed code.

I have program v1.0. Now I'm working on v1.1. So I want to make some small modification in one of the dialogs. It's simple: just added conditional call another function.

Delphi-Quellcode:

if cbPath.Checked then  // <-- exceptions here
  // olde code
else
  // new code
;

That's all. After run, app raises AV and EReadError (can't read value from some component property I don't uses it in event handler ). Both are in if line (when if removed then working )

WTF is that

[mkinzler]

Is cPath existing and of the right type?

[WojTec]

cbPath: TCheckBox, exists. I'm not talking about compilation, but about generated EXE.

[mkinzler]

Objects in Delphi are just references (pointers). These could reference into nirvana.

[Sailor]

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

[jaenicke]

An access violation, ok, but the most important information you forgot: at which address?

Regarding the missing properties:
Did you open every form in Delphi without getting a similar error?

[WojTec]

So, I have custom constructor, I'm setting components in this constructor, all what happen later depend on these settings - and working, till I add this check box or combo box (I tried both).

For example I'm drawing gradient, in method I'm using cbPath.Checked - working.
When I add this condition then stop working

Code:

---------------------------
Debugger Exception Notification
---------------------------
Project x.exe raised exception class EAccessViolation with message 'Access violation at address 0062DCF7 in module 'x.exe'. Read of address 00000000'.
---------------------------
Break   Continue   Help   
---------------------------

Code:

---------------------------
Debugger Exception Notification
---------------------------
Project x.exe raised exception class EReadError with message 'Error reading edtSteps.SpinOptions.MinValue: Access violation at address 0062DCF7 in module 'x.exe'. Read of address 00000000'.
---------------------------
Break   Continue   Help   
---------------------------

This behaviour is completely nonesense for me...

[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.