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From Clifton.Cr...@rrd.com
Subject Possible bug writing to "new" sheets
Date Wed, 18 Jun 2003 14:29:22 GMT
Are my emails getting through? I apologize if I sent this email already
it's just that my email in the office has been acting funny lately. I
normally get a copy of each one I send out but the last two have never come
back to me. Anyway, This is the message I sent yesterday outlining a simple
example. I just attempted several iterations going through the POI source
in debug and looking for inconsistencies. This may have nothing to do with
it but when the workbook serializes the individual sheets report different
sizes confirming the loss of data. If I write "Hello World!" to Sheet1 then
the sizes are 335, 263, and 263 for sheets 1-3 respectively. If I write
"Hello World!" to Sheet2 then the sizes are 301, 263, and 263 respectively.
Is there no way to write to a "new" sheet in POI? Must all sheets be either
used or created from scratch?

-Cliff
----- Forwarded by Clifton C Craig/US/DNY on 06/18/2003 10:22 AM -----
                                                                                         
                                            
                      Clifton C Craig                                                    
                                            
                                               To:      "POI Users List" <poi-user@jakarta.apache.org>
                               
                      06/17/2003 04:20         cc:                                       
                                            
                      PM                       Subject: Re: Cannot write to extra sheets(Document
link: Clifton C Craig)              
                                                                                         
                                            
                                                                                         
                                            



An example...
I create a new excel workbook named Template2.xls in my root (C) drive
using Excel 2000 on Win2K.
In Sheet1 I change the value of cell A:1 to "My Template".
I save this to my C drive.
I run the following program and the Sheet2 in Results.xls is not updated.
What gives?

package com.craig.JAS;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;

/**
 * @author craic0ld
 * Created Jun 17, 2003
 *
 * Purpose:
 *
 */
public class ExcelTest
{

      public static void main(String[] args)
      {
            try
            {
                  String xlFile = "C:\\Template2.xls";
                  POIFSFileSystem fs = new POIFSFileSystem(new
FileInputStream(xlFile));
                  HSSFWorkbook wkbk = new HSSFWorkbook(fs);
                  HSSFSheet sheet = wkbk.getSheet("Sheet2");
                  HSSFRow row = sheet.createRow(1);
                  HSSFCell cell = row.createCell((short)1);
                  cell.setCellValue("Hello World!");
                  FileOutputStream fo = new FileOutputStream("C:
\\Results.xls");
                  wkbk.write(fo);
                  fo.close();
                  System.out.println("Done!");
            } catch (Exception e)
            {
                  System.out.println(e.getMessage());
                  e.printStackTrace();
            }
      }
}


If I change it to write to Sheet1 then it works fine.


                                                                                         
                                             
                      Clifton.Craig@rrd                                                  
                                             
                      .com                     To:       "POI Users List" <poi-user@jakarta.apache.org>
                               
                                               cc:                                       
                                             
                      06/17/2003 03:03         Subject:  Re: Cannot write to extra sheets
                                             
                      PM                                                                 
                                             
                      Please respond to                                                  
                                             
                      "POI Users List"                                                   
                                             
                                                                                         
                                             
                                                                                         
                                             





Steve,

That's just the problem. With a "new" sheet I can't write to it. I mean, I
can write but the data is lost when it is serialized. What I'm saying is
the sheets that Excel creates brand new (When you Insert Worksheet or
create a new Workbook) cannot be written to unless they've been "used".

Cliff



                      "Steve"
                      <stephen@Basit.CO        To:
                      <poi-user@jakarta.apache.org>
                      M>                       cc:
                                               Subject:  Re: Cannot write
                      to extra sheets
                      06/17/2003 02:05
                      PM
                      Please respond to
                      "POI Users List"






if the sheet exists, you don't want to create it.
you want to use

 wb is the Workbook object
sheetnumber is the int sheetnumber you want
 String sheetname = wb.getSheetName(sheetnumber);
 HSSFSheet sheet = wb.getSheet(sheetname);

now that you have the sheet, you can operate on it.

----- Original Message -----
From: <Clifton.Craig@rrd.com>
To: "POI Users List" <poi-user@jakarta.apache.org>
Sent: Tuesday, June 17, 2003 10:46 AM
Subject: Re: Cannot write to extra sheets


>
> Does anybody have any clue as to how I can handle this scenario? Is there
> even a quick and easy way to test for a "new" or "empty" spreadsheet so
> that I can at least have my code delete the sheet prior to re-creating
it?
> Is the a way to shuffle or re-organize sheets in a workbook? I'm stuck on
> this. Please help.
>
> Thanks in advance,
> -Cliff
>
>
>
>                       Clifton.Craig@rrd
>                       .com                     To:       "POI Users List"
<poi-user@jakarta.apache.org>
>                                                cc:
>                       06/16/2003 11:55         Subject:  Re: Cannot write
to extra sheets
>                       AM
>                       Please respond to
>                       "POI Users List"
>
>
>
>
>
>
>
> I don't think creating the sheet is appropriate in this scenario. I have
3
> sheets in a brand new workbook. The 1st sheet has some data on it and I
> need to write to the 2nd sheet leaving the 3rd sheet blank. If I do a
> createSheet("Sheet2") I end up with two Sheet2's where the one I create
in
> POI is at the end. There is no method createSheetAt(int idx) available to
> create a sheet over an existing sheet. Now if there was some easy way to
> test for this condition then maybe I could delete/rewrite the sheet in
> question but it would be a good solution. I'd have problems getting the
new
> sheet in the correct order. If you consider a workbook with these "new"
> sheets intermingled and sporadically placed throughout other used sheets
> then it becomes a real nightmare. What do I do?
>
> -Cliff
>
>
>
>                       "Steve"
>                       <stephen@Basit.CO        To:       "POI Users List"
>                       <poi-user@jakarta.apache.org>
>                       M>                       cc:
>                                                Subject:  Re: Cannot write
>                       to extra sheets
>                       06/16/2003 10:34
>                       AM
>                       Please respond to
>                       "POI Users List"
>
>
>
>
>
>
> it doesn't create extra sheets. only the space for them.
> you need to create all sheets that you want,
> as far as I know.
>
> ----- Original Message -----
> From: <Clifton.Craig@rrd.com>
> To: <poi-user@jakarta.apache.org>
> Sent: Monday, June 16, 2003 8:59 AM
> Subject: Cannot write to extra sheets
>
>
> > Hello all,
> >
> > I am having a problem writing to the extra sheets that Excel creates by
> > default when you create a new workbook. I'm using the
> > jakarta-poi1.8.0-dev-20020919.jar version. I've developed a conversion
> > program that allows data to be merged with existing spreadsheets. The
> merge
> > works when I attempt to write on a sheet that has already been written
> on.
> > However, whenever I attempt to write to one of the blank sheets (sheets
2
> > and 3) that Excel creates automatically with an empty workbook it
doesn't
> > work. I can adjust the width of cells in these sheets but they do not
> > retain any info from the  cell.setCellValue() method calls. I verified
in
> > debug that these methods are not failing. My debugger (Eclipse) allows
me
> > to see the cell values before and after the method calls. I've
attempted
> > many tests where I enter the exact same parameters to merge data to an
> > existing workbook changing only the sheet number. The data is retained
> only
> > on the 1st sheet where I've already added data. This is the only
variance
> > in my test runs. In all cases I obtain references to the sheet, row and
> > cell objects the same way. I do a Workbook.getSheetAt(int num) to get
the
> > existing sheet. (I've tried with Workbook.getSheet(String name) as
well.)
> I
> > am using Worksheet.createRow(short row) to create the row and
> > Row.createCell(short cell) to create cell references. In my code I
verify
> > that the rows and cells do not exist prior to creating. In the latter
> case
> > I use the corresponding methods to obtain references to the existing
> > objects. What am I missing?
> >
> > -Cliff
> >
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: poi-user-unsubscribe@jakarta.apache.org
> > For additional commands, e-mail: poi-user-help@jakarta.apache.org
> >
>
>
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