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.

markieren

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

Is cPath existing and of the right type?

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

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

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

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?

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

markieren

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  
---------------------------

markieren

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...

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); , ...

@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?

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