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System iPortal Home ContentNew Functions in XLPARSER4Article ID:
57503Posted November 25th, 2008 in Other Languages Application
DevelopmentBy:Scott KlementQ: I've been trying your XLPARSER4
utility to read Excel spreadsheets, but I have a problem. My
subprocedures don't get called when a cell is empty. Since
someempty cells occur at the end of a row, how can I tell when a
row is complete?
A: XLPARSER4 skips empty cells because they don't exist in the
Excel file. Excelkeeps the size of the XLS file to a minimum by not
storing empty cells on disk.You're right that this behavior makes
it challenging to keep track of when a ne
w row begins or ends, because it's possible that the last cell
in a row will beempty and therefore you can't use the last cell in
the row to indicate that theentire row has been read.
I've had that problem myself, so I decided to add some new
functions to XLPARSER4 to help you detect when an entire row is
complete.
If you've been using my XLPARSER4 utility to read a spreadsheet,
you know that you provide it with three subprocedures, one to be
called when it finds a cell containing character data, one to be
called when it finds a cell containing numeri
7/27/2019 New Functions in XLPARSER4
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c data, and one to be called when it finds a cell with a formula
in it. If you haven't used the tool previously or would like to
refresh your memory, please read the most recent article about
XLPARSER4.
In this new update to XLPARSER4, you can provide two additional
subprocedures toXLPARSER4. The XLPARSER4 service program calls
these routines when a new row begins or ends, respectively.
For example, your program might start like this:
xlparse_notify( %paddr(clear_struct): %paddr(print_struct)
);
xlparse_workbook( '/tmp/november_sales.xls': %paddr(Numeric):
%paddr(Character): %paddr(Formula) );
The xlparse_notify() subprocedure is the one I added for this
article. It accepts two parameters: a subprocedure to call before
each row begins, and a subprocedure to call when each row is
complete.
In the above example, the clear_struct() subprocedure is called
when a row begins. That procedure clears the contents of a data
structure that will eventually contain one row-full of data from
the spreadsheet. Because this data structure wi
ll be cleared before every row, any empty cells will be empty in
the data structure. Clear_struct() will be called only for rows
that have data in the spreadsheet.
The print_struct() subprocedure will be called when all the
cells have been loaded for a particular row. It will be called only
for rows that have data in the spreadsheet. In this example,
print_struct() will be used to print the contents of the data
structure that contains one row.
The Numeric, Character, and Formula subprocedures will be called
when cells thatcontain Numeric, Character, and Formula data,
respectively, are found. They will be called repeatedly in a loop
for every cell found in the spreadsheet file. In the sample
program, they're used to load data into the data structure that
wil
l eventually be printed by the print_struct() routine.
You can download the updated copy of XLPARSER4 as well as the
sample program described in this article and all the sample
programs from the previous articles from the following
link:http://www.pentontech.com/IBMContent/Documents/article/57503_795_XlParse.zip
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