RE: Generated Excel - column count

[Anthony Andrews]

an I ask what changes you are making to the file? Excel is quite picky and will 
'see' that change has been made to a cell even if - to us - it seems completely 
empty. That may be the reason why you are seeing this problem.

Modha Khammammettu <[EMAIL PROTECTED]> wrote: In my test I have 6 columns.
After I programmatically create the file and read for no. of columns using 
getLastCellNum() I get 5
After I open and make a change and then read for the no of columns using 
getLastCellNum() I get 6
 
Note: This happens only for programmatically generated Excel files. Not the one 
that get created manually.

________________________________

From: Anthony Andrews [mailto:[EMAIL PROTECTED]
Sent: Sun 7/22/2007 11:39 PM
To: POI Users List
Subject: Re: Generated Excel - column count



Just as with an array structure in Java, POI numbers columns starting from zero 
and not one - or A - as Excel does. Therefore, if you have six columns on the 
sheet these will be numbered 0 to 5 and that is why - at least I think that is 
why - the getNumberOfColumns() method seems to return an incorrect figure.

PS It helps if you are simply iterating through the columns using a loop to 
have this happen IMO.

Modha Khammammettu  wrote: Hi All

I am using POI 3.0 rc4

I get wrong column count when I read excel file I created.

I use the following method to get Column count:

public int getNumberOfColumns(int sheetNumber){
 HSSFRow row = getRow(sheetNumber,2);
 return row.getLastCellNum();
}

I always get 1 column less than what I have. If I have 6 columns I get only 5 
as return value.
However, when I open the excel file and make a smal change (any change like 
adjusting column width etc) and save it, the same getNumberOfColumns method 
returns correct columns.
Is there any solution for this problem. Please let me know.

I create excel file programatically

ExcelFile excel = new ExcelFile();
excel.createWorkBook();

I add rows like this:

public void addRow(int sheetNumber, String content){
  HSSFSheet sheet = (HSSFSheet)wb.getSheetAt(sheetNumber);
  HSSFRow row = sheet.createRow(currentRowNumberBeingAdded);
  currentRowNumberBeingAdded = currentRowNumberBeingAdded + 1;
 
  StringTokenizer st = new StringTokenizer(content,"~");
  int cellNumber = 0;
  while (st.hasMoreTokens()){
       HSSFCell cell = row.createCell((short)cellNumber);
       cell.setCellType(HSSFCell.CELL_TYPE_STRING);
       cell.setCellValue(st.nextToken());
       cellNumber = cellNumber + 1;
  }
 
 }

I save like this:
excel.saveWorkBook(destn);

I import these:

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
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;


Thanks

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