程序很简单,在Application中测试TStringStream的用法,编译通过,运行时就抛出EAccessViolation异常,请问为什么?正确的用法应该怎么用?谢谢?unit Unit1;interfaceuses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs;type
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;
stringStream:TStringStream;implementation{$R *.dfm}procedure TForm1.FormCreate(Sender: TObject);
begin
stringStream.Create('');
stringStream.WriteString('test');
showmessage(stringStream.DataString);
end;end.
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs;type
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;
stringStream:TStringStream;implementation{$R *.dfm}procedure TForm1.FormCreate(Sender: TObject);
begin
stringStream.Create('');
stringStream.WriteString('test');
showmessage(stringStream.DataString);
end;end.
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs;type
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;
stringStream:TStringStream;
writer: TWriter;implementation{$R *.dfm}procedure TForm1.FormCreate(Sender: TObject);
begin
//stringStream.Create('');
writer.Create(stringStream,1024);
writer.WriteString('test');
showmessage(stringStream.DataString);
end;end.