Inaccessible value causing Access violation [duplicate] - delphi

Question

This question already has answers here:
Delphi: Access Violation at the end of Create() constructor
(2 answers)
Closed 7 years ago.
I have a program that makes a bike (TObject)
When calling my Create method, I get an access violation error 00453359 and a write of address 00000004.
constructor MyBike.Create(iPrice, iStroke, iYear, iCC: Integer; sName,
sModel: string);
begin
fCC := iCC; // <- Here is the error
fPrice := iPrice;
fStroke := iStroke;
fYear := iYear;
fName := sName;
fModel := sModel;
When I watch that line, it says that it is an inaccessible value, as for all the variables there.
Here is the rest of my class:
type
MyBike = class(TObject)
private
fCC, fStroke, fYear, fPrice: Integer; //I will at a later stage use fPrice as a currency
fName, fModel: string;
public
constructor Create(iPrice, iStroke, iYear, iCC: Integer; sName, sModel:
string);
function GetValues: string;
end;
implementation
{ MyBike }
constructor MyBike.Create(iPrice, iStroke, iYear, iCC: Integer; sName,
sModel: string);
begin
fCC := iCC;
fPrice := iPrice;
fStroke := iStroke;
fYear := iYear;
fName := sName;
fModel := sModel;
end;
and my main unit:
private
{ Private declarations }
NewBike : MyBike;
public
{ Public declarations }
end;
var
Form1: TForm1;
redtSavedObject: TRichEdit;
btnClearSavedObject: TButton;
implementation
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
begin
btnSaveToText.Enabled := False;
btnSavetodata.Enabled := False;
end;
procedure TForm1.btnSaveasObjectClick(Sender: TObject);
var
Price, Year, CC, Stroke : Integer;
Name, Model : String;
begin
Price := StrToInt(edtPrice.Text); //All of these values are fine
Year := StrToInt(edtYear.Text);
CC := StrToInt(edtCC.Text);
Stroke := StrToInt(edtStroke.Text);
Name := edtName.Text;
Model := edtModel.Text;
NewBike.Create(Price, Stroke, Year, CC, Name, Model);
I looked at this post: Delphi strange inaccessible value (acess violation) o.O and says I must edit the project settings to:
Debug info: ON
Local Symbols: ON
Optimization: OFF.
Ive done a rebuild, still no change. Ive gone as far as restarting my pc to no avail

Answer 1

Change
NewBike.Create(Price, Stroke, Year, CC, Name, Model);
To
NewBike := MyBike.Create(Price, Stroke, Year, CC, Name, Model);
Thats the correct way to mane a new instance of a Class.
When you create an new instance of a class you call then constructor on the Class (MyBike) and assign it's retun value to a variable NewBike := MyBike.Create(...);`
Inside every object (instance of a class) you have a hidden parameter called Self more info on Delphi Basics. The problem in your case was that you didn't create a new instance of the class and therefor your self variable was nil.