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I have a program that writes some data into a spreadsheet, which I want to then analyse again to produce some HTML output. The latter part works in testing but putting the whole lot together has raised an interesting problemette. Code replicated below. My debugging is showing that $gOutWorkbook has a value of "undef" upon return from ReadData, and I have no means of knowing why the workbook is not being (re-)opened to be read, when I have populated it with data previously (not shown here)

So: can I find out the reason *why* the workbook is not being opened properly? (ie some error value from somewhere) I have even put a 10 second delay before I attempt the open, to allow the OS to 'settle down' after closing the file, post writing to it but that doesn't help at all All other variables have relevant and correct values associated with them at the crucial point in the software. Previous ReadData calls work in other parts of the software suite, so it is only this section that is letting me down. 

        # Re-open as a read only
        # Read in the workbook and all its data
        $gOutWorkbook = ReadData ($lOutputFileName);
        $gOutWorksheet = $gOutWorkbook->[$gOutWorkbook->[0]{sheet}{"my
+Sheet"}];

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In reply to Spreadsheet::read how to get error? by gsd4me

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