Question

delphi已经声明变量但调用该变量时依然报内存错误

代码如下（节选）：
interface

uses
Windows,Classes,Driver_Unit;

type
TADCard=class
private
FHandle: Longint;
FErrorCode:Longint;
FLock: TRTLCriticalSection;
FOpened:Boolean;
public
function OpenDevice: Boolean;
end;
implementation
function TADCard.OpenDevice: Boolean;
begin
if not FOpened then //这句报内存错误
begin
……
end;
Result := FOpened;
end;

好像是FOpened未被创建，但是我明明运行过CREATE了，怎么会没被创建呢？

Answer 1

应该是TADCard类没创建！

Answer 2

unit Unit1;

interface

uses

Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

Dialogs;

type

Answer 3

TADCard 你这个类创建了吗？ 建议多贴一点代码上来有助于分析