Delphi-error

[question]

Hello,

I have made a Delphi project group and under the project I have created a new project including some unit and forms.
When I run the program ,it shows the following error-

“Zugriffsverletzung bei Adresse 0040538B in Module ‘projectName.exe’. Lesen von Adresse 00000000".


Could anybody please tell me, what does this error means?

[mkinzler]

You seem to try to access an uninitialized object ( not instantiated)

[Klaus01]

Hi,

when do you see this error message?
During programm startup?

Something is trying to access an Instance which has been created or has already been freed.

Klaus

[question]

Hi,
I have another question

I have created one form which has he following attributes:
type
TForm1 = class(TForm)
btnEnter: TButton;
btnDisplay: TButton;
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure btnEnterClick(Sender: TObject);
procedure btnDisplayClick(Sender: TObject);
I have another form form2 which has its own button, but I would like to inherit the form1 into form2, but I don’t want to inherit the complete form1 ,just few functionality,such as ( btnEnter: TButton; procedure btnEnterClick(Sender: TObject) ), but I don’t have idea ,how to inherit a form partially.
Do you have any suggestion please?

[Klaus01]

Hi,

create a third unit with the button methods/procedure/actions.
This unit can then be used in form1 and form2.

Basicaly split functional things from user-interface.

Klaus

[Union]

Please tag your sourcecode. And post only one question per thread.

[Furtbichler]

Zitat von question:

Could anybody please tell me, what does this error means?

Why didn't you let google translate this for you. That's what I usually do when a stranger tells me something I don't understand.

Zitat von google:

"Access violation at address 0040538B in module 'projectName.exe'. Read from address 00000000 ".

And almost every programmer will know what 'Read from address 0000000' means (zero, null, nil etc)