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How to get the unique identification of the images which are present in excel sheet using aspose java

I am trying to add few images to excel sheet manually. After that I have to read those images in java code using aspose cells library. I can read using aspose as below.
Workbook book = new Workbook("test\\output.xlsx");
WorksheetCollection collection = book.getWorksheets();
Worksheet worksheet = collection.get(0);
PictureCollection pics = worksheet.getPictures();
System.out.println("Total number of pictures in the sheet : "+pics.getCount());
for(int i=0; i<pics.getCount(); i++) {
Picture pic = pics.get(i);
System.out.println("Name of the image at index "+i+" is "+pic.getName());
}
But I have an excel sheet as below in which I added images manually.
I have to read it to a HashMap such that key will be the Code column values and values will the image column values. I want proper correspondence. Since images are not cell based I could not get the Map in that way. So is there any way I can map proper 'Code' column value with proper 'Images' column value.
Thank you in Advance.

Evaluate cell which uses named field in its formula - Apache POI

I'm having a problem evaluating excel sheet cell which uses named cell in its formula. I'm using apache-poi version 3.17, java 1.8 and the file I'm working with is .xlsm. Here is an example code:
//Getting the excel file from the database
Document doc = documentRepository.findByDocumentType(DocumentType.EXAMPLE);
InputStream fis = new ByteArrayInputStream(doc.getFileData());
Workbook wb = new XSSFWorkbook(fis);
Sheet mappingSheet = workbook.getSheet("Quote services");
FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();
// This cell contains a formula which uses named cell
CellReference cellReference = new CellReference("A109");
Row row = mappingSheet.getRow(cellReference.getRow());
Cell cell = row.getCell(cellReference.getCol());
CellValue cellValue = evaluator.evaluate(cell);
This gives me the following error:
org.apache.poi.ss.formula.FormulaParseException: Specified named range
'Discount' does not exist in the current workbook.
The excel formula looks something like that:
=Discount*A7
Where Discount is A5 and if I change the formula to look like this:
=A5*A7
it works fine.
This is kind of strange cause if I try to get the named field Discount it finds it, but if I use evaluate on a cell which uses the field it doesn't.
The document is predefined so I can't change anything in it. If I name the given discount cell with poi and with the same name there is no problem, but I don't want to do this cause there are more named fields in the document and if something change I have to change the code. Any help will be appreciated!
I found the problem! It was that the Discount field was referenced from a hidden sheet in the document and it was referenced like this: Discount instead of 'Quote services'!Discount.

Are you sure that Discount is indeed within the Workbook that you are evaluating? The message is pretty clear.
Can you show exactly how the formula looks like - is it something like this:
=SUM('C:\Data\[Finances.xlsx]Discount'!D10:D25)
Try setIgnoreMissingWorkbooks(true), and if it works, then the Discount is set in another workbook. setIgnoreMissingWorkbooks.

How to add Data validation to entire column of an excel sheet using apache poi in java?

I have a requirement Where I need to add data validation to an entire column rather than a specific cell. I went through the documentation of Apache poi and found the example below
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("Data Validation");
CellRangeAddressList addressList = new CellRangeAddressList(0, 0, 0, 0);
DVConstraint dvConstraint = DVConstraint.createExplicitListConstraint(
new String[]{"10", "20", "30"});
DataValidation dataValidation = new HSSFDataValidation
(addressList, dvConstraint);
dataValidation.setSuppressDropDownArrow(false);
sheet.addValidationData(dataValidation);
But the above example creates a drop down datavalidation for a specific cell. In this case row 0, column 0. The rest of the cells in a column doesn't have validation. But in actual excel file we can do it so it should be possible. I tried and searched a lot but could not come to a solution. Please help..

Another way to get the validation on the whole column you can also use -1 for both row parameters like:
CellRangeAddressList columnRange = new CellRangeAddressList(-1, -1, columnIndex, columnIndex);
Tested this in POI 3.16

Chetan all the four parameters of the constructor CellRangeAddressList as below
CellRangeAddressList(index_of_starting_row, index_of_ending_row, index_of_starting_column,index_of_ending_column);
so eg. if there are 10 rows and 5 columns, and if you want to add drop down list in 2nd column throughout the all rows means in entire 2nd column then use below code for cell address
CellRangeAddressList addressList = new CellRangeAddressList(0,9,1,1);
based on your code this will add drop down with the values 10,20,30 in entire 2nd column if you add the above line of code by replacing your code.
hope this will clear the concept and you would get the desire result.

How to read the values of a dropdown using Jxl API

I have an Excel sheet in which 2 columns have a dropdown with one about 4-5
values and the other with 2 values that can be selected. I would like to read
the value that is there for each row in these two columns. . What is the code
sample to do that? I did browse a while on the net and this forum, but did not
find any answers. I posted in the JExcel Yahoo groups , but no success.
I have added the following code, but this does not help. This code sample just prevents the "common Assertion failed" error
WorkbookSettings settings = new WorkbookSettings();
settings.setSuppressWarnings(true);
Workbook workbook = Workbook.getWorkbook(sis, settings);
The sheet gives an erroneous row count when the dropdown is there. Has anyone been able to read the values selected in the drop down ?

If you have applied an autofilter to your Excel sheet then probably that is responsible for the issue. I would suggest you to please remove the autofilter and then try fetching the value of the combobox.
Cell yourCell = yourSheet.getCell(x,y);
String comboboxValue = yourCell.getContents();
logger.log("value selected in combobx is : " + comboboxValue );

POI - SXSSFWorkbook - Excel found unreadable content

I have an existing workbook that acts as template. I tried to update a cell value in an existing row, meaning the adjacent cell has a value. The problem is that after the file is created and I open it, I get the following error:
"Excel found unreadable content in...."
I assume the reason is SXSSFWorkbook only handles writing and if a row exists it cant update the contents of the row, which would entail reading and then writing - is this correct or am I experiencing a bug?
Thanks

Another issue is that if you're using addMergedRegion, the CellRangeAddress values for rows and columns have to be in ascending numerical order:
// Note that rows and columns for CellRangeAddress constructor have to be in ascending order
// The commented out line below will generate an error when opening the sheet:
// sheet.addMergedRegion(new CellRangeAddress(lastRow, lastRow-(rowsTobeCreated-1), 0, 0));
// In order this call works:
sheet.addMergedRegion(new CellRangeAddress(lastRow-(rowsTobeCreated-1), lastRow, 0, 0));

In case anyone else has this problem, check to make sure the length of your SheetName is not too long. I was getting this error when setting the workbook sheet name longer than around 30 characters.
XSSFWorkbook wb = new XSSFWorkbook();
XSSFSheet sheet = wb.createSheet();
wb.setSheetName(0, "Supporting Documentation"); // make sure this is not too long