Delphi7Personal EAccessViolation 同时创建从 TImage 派生的组件

Question

我有一个任务是在 Delphi 中创建一个游戏，因为棋盘的大小是 7x7，我想通过从 TImage 派生我自己的组件来完成。由于我想在数组中获得板上所有图块的位置，并且我想使用 Create 方法来做到这一点，但是每当我尝试时，我在调用 .Create(self) 时遇到了 EAccessViolation

这是我的组件的代码：

        unit iles1;

       interface

         SysUtils, Classes, Controls, ExtCtrls;

type
  Tiles1 = class(TImage)
  private
      FPlayer:Boolean; //determines whether it is an empty field or a player
      FTeam:Boolean;   //determines the team the tile belogns to
      FBall:Boolean;   //posession of the ball
      {FBackLight : whether it is available to interact  with this component,
      with the method on click after one of the tiles has already been chosen,
      if it is not lit but belongs to the same team, it is flagged as chosen
      but not as lit, this field is used to determine whether i can pass a ball
      to this direction or swap places with other player from the same team}
      FBackLight:Boolean;
      FChosen:Boolean; //whether the player decided to click on it
      {FPostion determines where it is in a table, it ranges from
      36 to 0 where  its position divided by 10 determines the column
      and position mod 10 determines the row}
      FPosition:Byte;
    { Private declarations }
  protected
    { Protected declarations }
  public
     constructor Create(AOwner : TComponent);  override;
    { Public declarations }
  published
     property Team: boolean
        read FTeam
        write FTeam;
     property Ball: boolean
       read FBall
       write FBall;
     property Player:boolean
       read FPlayer
       write FPlayer;
     property BackLight:boolean
       read FBackLight
       write FBackLight;
     property Chosen:boolean
      read FChosen
      write FChosen;
     property Position:byte
      read FPosition
      write FPosition;
     end;

    { property Ball: Boolean;
     //read FHasBall
     //write FSetBall;
     end;}
    { Published declarations }

procedure Register;

implementation
procedure Register;
begin
  RegisterComponents('Samples', [Tiles1]);
end;

{Creator procedure calling the Timage creator
and setting parent to self(impossible here, then i will do it in
 main window), visible to true
}
constructor Tiles1.Create(AOwner:TComponent); 
begin
  inherited;
   FPlayer:=false;
   FTeam:=false;
   FBall:=false;
   FBackLight:=false;
   FChosen:=false;
   FPosition:=0;
 end;
end.

这里我有使用它的主菜单方法：

procedure TForm1.FormCreate(Sender: TObject);
var x,y:Integer;
begin
  for y:=1 to INAROW do begin
    for x:=1 to INAROW do begin
      tiles[x,y].Create(self);
      tiles[x,y].Parent:=self;
      tiles[x,y].Visible:=true;
      tiles[x,y].Top:=(y-1)*(GAPBETWEEN+TILES1HEIGHT)+GAPTOP;
      tiles[x,y].Left:=GAPLEFT+(x-1)*(GAPBETWEEN+TILES1WIDTH);
      tiles[x,y].Width:=TILES1WIDTH;
      tiles[x,y].Height:=TILES1HEIGHT;
      tiles[x,y].Position:=10*x+y;
      tiles[x,y].BackLight:=false;
      tiles[x,y].Ball:=false;
      tiles[x,y].Player:=false;
      tiles[x,y].Chosen:=false;
     end;
  end;
  setAlphaTeam;
  setBetaTeam;
  setTiles;
end;

Answer 1

tiles[X,Y] := Tiles1.Create(self);

假设tiles是一个Tiles1数组。

构造函数实际上是类方法，您在类而不是实例上调用它们。

由于tiles[X,Y] 为nil，您遇到了访问冲突。如果您注释掉了创建行，您会尝试设置父属性。