_IENavigate Error

[muzle6074]

$IE_Topic = $IE_Links.Item(24)
_IENavigate($IE, $IE_Topic.href)

If the page fails to load and the collection of links is not stored in $IE_Topic then _IENavigate throws an error. How can I prevent executing the _IENavigate from running if there is no collection of links in $IE_Topic?

Regards

--Alex

[amokoura]

I presume the links object is a normal collection object. You could then use the Count property:

if $IE_Links.Count = 0 then
  MsgBox(0,0,'Link count zero!')
endif

[muzle6074]

Hi amokoura,

I ran the script and canceled the page load to try replicate the error but this happened:

The requested action with this object has failed.:

If $IE_Links.Count = 0 Then

If $IE_Links.Count ^ ERROR

Code:

$IE_Links = _IELinkGetCollection($IE)
        If $IE_Links.Count = 0 Then
            MsgBox(0, "", "No collection")
        EndIf   
        $IE_Topic = $IE_Links.Item(24)
        _IENavigate($IE, $IE_Topic.href)

[amokoura]

[...]

ERROR

[...]

Code:

$IE_Links = _IELinkGetCollection($IE)
        If $IE_Links.Count = 0 Then
            MsgBox(0, "", "No collection")
        EndIf   
        $IE_Topic = $IE_Links.Item(24)
        _IENavigate($IE, $IE_Topic.href)

OK I guess _IELinkGetCollection failed and didn't return any object at all.

How about checking _IELinkGetCollection's errors (Check out from manual) before using its data.

[furrycow]

From what i recall doing this a while back, when IE fails to load a webpage it finds three links; because of the help links - eg;troubleshoot connection (and then two others)

[amokoura]

From what i recall doing this a while back, when IE fails to load a webpage it finds three links; because of the help links - eg;troubleshoot connection (and then two others)

If it's true, the function should return a Collection object. Probably the Count property isn't set then.

As the manual says, using @EXTENDED should also give the link count.

But i don't know, error checking by evaluating the link count sounds tricky. Maybe the page should be checked some other way before going any deeper.

[DaleHohm]

As mentioned above, see the helpfile for _IELinkGetCollection:

Success: Returns an object collection of all links in the document, @EXTENDED = link count

Failure: Returns 0 and sets @ERROR

So, check @EXTENDED to see if it is > 0, check the return value (what you expect to be a collection) and see if it is 0 instead or is the IsObj check on the return value.

You can also use _IEErrorHandlerRegister() which will trap the COM error and allow your script to continue.

Dale

[muzle6074]

From what i recall doing this a while back, when IE fails to load a webpage it finds three links; because of the help links - eg;troubleshoot connection (and then two others)

After some quick testing it does return a small collection of items even if the page does not load.

Thank you Dale I have used the code you suggested to test @extended.

Thank you all for your contribution!

Regards

--Alex