Form can't see components without full path...

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July 25th, 2012, 11:16 AM

dlumley

Contributing User

Join Date: May 2002

Posts: 86

Time spent in forums: 7 h 29 m 26 sec
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Form can't see components without full path...

Probably a stupid question but I'm stumped...

Why on all my other forms I can...

Code:

Procedure changeLabelname;
begin
    label1.caption := 'New Caption';
end;

But on a new form I've just added I have to declare the full path i.e.

Code:

Procedure changeLabelName;
begin
     form1.label1.caption := 'New Caption';
end;

Without the "form1" it gives an undeclared identifier error? I'm sure this is simple but I'm stumped...

July 25th, 2012, 12:37 PM

majlumbo

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Join Date: Jun 2008

Posts: 255

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Reputation Power: 5

Note the difference in your procedure header:

Yours:
Procedure changeLabelName;

As part of your Form Object (assuming form is called Form1)

Procedure TForm1.changeLabelName;

As declared, ChangeLabelName has no reference to your form, it is in essence a global procedure, not a method of your form. Caption is a property of TForm, which your form is derived from.

So, if you are adding ChangeLabelName as a procedure to your form, you need to add it to your form's declaration (presumably in the private section - unless you want to be able to call it from another form)

Code:

TForm1 = class(TForm)
...
private
   procedure ChangeLabelName;
   ...
end;

After declaring it in the Form's object, you can use the keyboard shortcut Ctrl-Shift-C, and it will add the method's stub into your code.

Last edited by majlumbo : July 25th, 2012 at 12:44 PM.

July 25th, 2012, 11:24 PM

Luthfi

Contributing User

Join Date: May 2012

Posts: 140

Time spent in forums: 1 Day 4 h 58 m 17 sec
Reputation Power: 2

Quote:

Originally Posted by dlumley

Probably a stupid question but I'm stumped...

Why on all my other forms I can...

Code:

Procedure changeLabelname;
begin
    label1.caption := 'New Caption';
end;

But on a new form I've just added I have to declare the full path i.e.

Code:

Procedure changeLabelName;
begin
     form1.label1.caption := 'New Caption';
end;

Without the "form1" it gives an undeclared identifier error? I'm sure this is simple but I'm stumped...

I believe the first ChangeLabelName procedure is a method of class TForm1. It's accurate declaration should be:

Code:

procedure TForm1.ChangeLabelName;

The second one might be an "independent"/"ordinary" procedure or a method of another class.

Form can't see components without full path...

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