我的后台access数据库里的表是这样的结构:exam_content ole对象,exam_score 数字
我对此写了个类。但是不太熟悉,写成了下面这样的。调试通不过。type Texam=class(Tobject)
private
Fexam_Content:Tblobstream;
Fexam_score:integer;
FValidData:Boolean;
function getExamContent:Tblobstream;
procedure setExamContent(const Value: Tblobstream);
public
constructor create;
destructor destory;
property exam_Content:Tblobstream read getExamContent write setExamContent ;
property exam_score:integer read GetExamScore write SetExamScore;
end;implementationfunction Texam.getExamContent:Tblobstream;
begin
result:=FExam_Content; //出错后,调试光标停在此句.(不知道是不是这样写的)。
end;procedure Texam.setExamContent(const Value: Tblobstream);
begin
if Fexam_Content<>value then
Fexam_Content:=value;
end;然后在FORM单元中写
var aexam:texam;
begin
aexam:=texam.create();
richedit1.Lines.SaveToStream(aexam.exam_Content);
end;出现访问违例错误。应该怎么样写呢?初次这样写不懂的太多了。望大虾指教。
我对此写了个类。但是不太熟悉,写成了下面这样的。调试通不过。type Texam=class(Tobject)
private
Fexam_Content:Tblobstream;
Fexam_score:integer;
FValidData:Boolean;
function getExamContent:Tblobstream;
procedure setExamContent(const Value: Tblobstream);
public
constructor create;
destructor destory;
property exam_Content:Tblobstream read getExamContent write setExamContent ;
property exam_score:integer read GetExamScore write SetExamScore;
end;implementationfunction Texam.getExamContent:Tblobstream;
begin
result:=FExam_Content; //出错后,调试光标停在此句.(不知道是不是这样写的)。
end;procedure Texam.setExamContent(const Value: Tblobstream);
begin
if Fexam_Content<>value then
Fexam_Content:=value;
end;然后在FORM单元中写
var aexam:texam;
begin
aexam:=texam.create();
richedit1.Lines.SaveToStream(aexam.exam_Content);
end;出现访问违例错误。应该怎么样写呢?初次这样写不懂的太多了。望大虾指教。
destructor destory; override;constructor Texam.create;
begin
Fexam_Content := Tblobstream.Create
end;destructor Texam.destory;
begin
Fexam_Content.Free;
Inherited;
end;
create和destory不需要加override也可以的吧。//##############################################
constructor Texam.create;
begin
Fexam_Content := Tblobstream.Createend;
destructor Texam.destory;
begin
Fexam_Content.Free;
Inherited;
end; //############################################
这段代码也写了。但是仍然没有用处的。