还是ｗｅｂｂｒｏｗｅｒ编程问题 ( 积分: 100 )

D

delphilxh

Unregistered / Unconfirmed

GUEST, unregistred user!

• 2007-04-23

• #1

var
tmpDoc:IHTMLDocument2;
oneframe:Ihtmlwindow2;
Begin
.......
if oneframe<>nil then
Begin

tmpDoc:=oneframe.document;//这里如果oneframe.document=nil 则报错，应该怎么避免呢？
if tmpDoc<>nil then
Result:=oneframe.document.title;
end;
end;

 

白

白河愁

Unregistered / Unconfirmed

GUEST, unregistred user!

• 2007-04-24

• #2

if assigned(oneframe.document) then
begin
tmpDoc:= oneframe.document;
....
end;

 

J

jsxjd

Unregistered / Unconfirmed

GUEST, unregistred user!

• 2007-04-24

• #3

try
tmpDoc:= oneframe.document;
excpte
end;

 

E

e-

Unregistered / Unconfirmed

GUEST, unregistred user!

• 2007-04-24

• #4

var
tmpDoc:IHTMLDocument2;
oneframe:Ihtmlwindow2;
Begin
.......
if (oneframe<>nil) and (oneframs.document<>nil) then
Begin

Result:=oneframe.document.title;
end;
end;

 

D

dcs_dcs

Unregistered / Unconfirmed

GUEST, unregistred user!

• 2007-04-24

• #5

用assigned

 

D

delphilxh

Unregistered / Unconfirmed

GUEST, unregistred user!

• 2007-04-25

• #6

assigned
不管用,还是报错