Thanks Nick.

I've not found any API to do so till now.
And I've compared the two excel files using hssf.dev.BiffViewer.

The following description differs in the result.
=================================================
Offset 0x24fd (9469)
recordid = 0x23e, size = 18
[WINDOW2]
    .options        = 6b6
       .dispformulas= false
       .dispgridlins= true
       .disprcheadin= true
       .freezepanes = false
       .displayzeros= true
       .defaultheadr= true
       .arabic      = false
       .displayguts = true
       .frzpnsnosplt= false
       .selected    = true
       .paged       = true
       .svdinpgbrkpv= false
    .toprow         = 0
    .leftcol        = 0
    .headercolor    = 40
    .pagebreakzoom  = 0
    .normalzoom     = 0
    .reserved       = 0
[/WINDOW2]
=================================================
This is the descriptions of the file with gridlines displayed.
The "disgridline" property is set to "false" when the gridlines not
displayed.

Hope this useful...

Best Regards,
Moody

2008/3/27, Nick Burch <[EMAIL PROTECTED]>:
>
> On Thu, 27 Mar 2008, Moody Lee wrote:
> > I'm working with POI 3.0.2-FINAL, using it to generate some report.
> > Does anyone know how to perform the following action by API like I'm
> > operating the Excel file?
>
>
> I'm not aware of anything, so if you've searched and couldn't find the
> answer, it might not currently be possible
>
> What you'll probably want to do is create a very simple excel file,
> without grid lines. Save that, then turn on grid lines, and save to
> another file. Use the various dev tools (poifs.dev.POIFSViewer and
> hssf.dev.BiffViewer) to spot what excel changed between the two files.
>
> Once you know that, it should hopefully be fairly easy to support it
> nicely in poi. Until we know what records get changed / added / removed,
> supporting it isn't really possible
>
>
> Nick
>
>
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